Antimicrobial susceptibility of 6 antimicrobial agents in Helicobacter pylori clinical isolates by using EUCAST breakpoints compared with previously used breakpoints | Enfermedades Infecciosas y Microbiología Clínica

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cervicales de alto grado" ] ] "contieneResumen" => array:2 [ "en" => true "es" => true ] "contieneTextoCompleto" => array:1 [ "en" => true ] "contienePdf" => array:1 [ "en" => true ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "Elena López Diez, Sonia Pérez, Amparo Iñarrea, Angel de la Orden, Máximo Castro, Sheila Almuster, Leonardo Tortolero, Moises Rodríguez, Ruben Montero, Antonio Ojea" "autores" => array:10 [ 0 => array:2 [ "nombre" => "Elena" "apellidos" => "López Diez" ] 1 => array:2 [ "nombre" => "Sonia" "apellidos" => "Pérez" ] 2 => array:2 [ "nombre" => "Amparo" "apellidos" => "Iñarrea" ] 3 => array:2 [ "nombre" => "Angel" "apellidos" => "de la Orden" ] 4 => array:2 [ "nombre" => "Máximo" "apellidos" => "Castro" ] 5 => array:2 [ "nombre" => "Sheila" "apellidos" => "Almuster" ] 6 => array:2 [ "nombre" => "Leonardo" "apellidos" => "Tortolero" ] 7 => array:2 [ "nombre" => "Moises" "apellidos" => "Rodríguez" ] 8 => array:2 [ "nombre" => "Ruben" "apellidos" => "Montero" ] 9 => array:2 [ "nombre" => "Antonio" "apellidos" => "Ojea" ] ] ] ] ] "idiomaDefecto" => "en" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S0213005X16000847?idApp=UINPBA00004N" "url" => "/0213005X/0000003500000005/v2_201804050444/S0213005X16000847/v2_201804050444/en/main.assets" ] "en" => array:21 [ "idiomaDefecto" => true "cabecera" => "Original article" "titulo" => "Antimicrobial susceptibility of 6 antimicrobial agents in Helicobacter pylori clinical isolates by using EUCAST breakpoints compared with previously used breakpoints" "tieneTextoCompleto" => true "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "278" "paginaFinal" => "282" ] ] "autores" => array:1 [ 0 => array:4 [ "autoresLista" => "Teresa Alarcón, Pedro Urruzuno, Maria Josefa Martínez, Diego Domingo, Laura Llorca, Ana Correa, Manuel López-Brea" "autores" => array:7 [ 0 => array:4 [ "nombre" => "Teresa" "apellidos" => "Alarcón" "email" => array:1 [ 0 => "talarcon@helicobacterspain.com" ] "referencia" => array:3 [ 0 => array:2 [ "etiqueta" => "a" "identificador" => "aff0005" ] 1 => array:2 [ "etiqueta" => "b" "identificador" => "aff0010" ] 2 => array:2 [ "etiqueta" => "*" "identificador" => "cor0005" ] ] ] 1 => array:3 [ "nombre" => "Pedro" "apellidos" => "Urruzuno" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "c" "identificador" => "aff0015" ] ] ] 2 => array:3 [ "nombre" => "Maria Josefa" "apellidos" => "Martínez" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "d" "identificador" => "aff0020" ] ] ] 3 => array:3 [ "nombre" => "Diego" "apellidos" => "Domingo" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "a" "identificador" => "aff0005" ] ] ] 4 => array:3 [ "nombre" => "Laura" "apellidos" => "Llorca" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "a" "identificador" => "aff0005" ] ] ] 5 => array:3 [ "nombre" => "Ana" "apellidos" => "Correa" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "a" "identificador" => "aff0005" ] ] ] 6 => array:3 [ "nombre" => "Manuel" "apellidos" => "López-Brea" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "a" "identificador" => "aff0005" ] ] ] ] "afiliaciones" => array:4 [ 0 => array:3 [ "entidad" => "Servicio de Microbiologia, Hospital Universitario de la Princesa, Instituto de Investigación Sanitaria Princesa (IIS-IP), Madrid, Spain" "etiqueta" => "a" "identificador" => "aff0005" ] 1 => array:3 [ "entidad" => "Departamento de Medicina Preventiva, Salud Pública y Microbiologia, Facultad de Medicina, Universidad Autónoma de Madrid, Spain" "etiqueta" => "b" "identificador" => "aff0010" ] 2 => array:3 [ "entidad" => "Unidad de Gastroenterología Pediátrica, Hospital Universitario Doce de Octubre, Instituto de Investigación Hospital 12 de Octubre, Madrid, Spain" "etiqueta" => "c" "identificador" => "aff0015" ] 3 => array:3 [ "entidad" => "Unidad de Gastroenterología Pediátrica, Hospital Universitario Niño Jesus, Instituto de Investigación Sanitaria Princesa (IIS-IP), Madrid, Spain" "etiqueta" => "d" "identificador" => "aff0020" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "Sensibilidad de aislamientos clínicos de Helicobacter pylori a seis antimicrobianos utilizando los criterios EUCAST y comparando los resultados con criterios utilizados anteriormente" ] ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "fig0005" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 2701 "Ancho" => 2542 "Tamanyo" => 361966 ] ] "descripcion" => array:1 [ "en" => "Distribution of antibiotic MICs for H. pylori clinical isolates. MICs were determined by E-Test and adjusted to the highest two-fold dilution values. MICs of amoxicillin (A) tetracycline (B), metronidazole (C), clarithromycin (D), rifampicin (E) and levofloxacin (F) are shown. Filled arrows indicate the EUCAST resistance breakpoints and dashed arrows the previously used breakpoints. Exe Y shows the number of H. pylori isolates for each MIC value and Exe X shows each MIC value (mg/L). Arrows indicates the EUCAST (<elsevierMultimedia ident="201804050444524911"></elsevierMultimedia>) or previous (<elsevierMultimedia ident="201804050444524912"></elsevierMultimedia>) resistance breakpoint." ] ] ] "textoCompleto" => "IntroductionHelicobacter pylori is a Gram-negative spiral rod colonizing the gastric mucosa mainly at the antrum, producing gastric inflammation. Patient could remain without symptomatology for his o her whole life or develop several pathologies such as duodenal or gastric ulcer; mucosa-associated lymphoid tissue (MALT) or gastric cancer.<a class="elsevierStyleCrossRef" href="#bib0110">1</a> Association with non-digestive diseases has also been described.<a class="elsevierStyleCrossRef" href="#bib0115">2</a> When treatment is needed, several triple or quadruple therapies could be used. Amoxicillin, tetracycline, metronidazole and clarithromycin are the antimicrobials most frequently used combined with proton pump inhibitors or bismuth salts.<a class="elsevierStyleCrossRef" href="#bib0120">3</a> Several papers have stressed the importance of doing H. pylori susceptibility testing before administering the treatment.<a class="elsevierStyleCrossRef" href="#bib0125">4</a> However, different methodology could be performed for in vitro susceptibility testing. Several Societies and Committees have defined reference methods and breakpoints for categorized organisms as susceptible or resistant to antimicrobial agents.The National Committee for Clinical Laboratory Standard (NCCLS) (now the Clinical and Laboratory Standards Institute, CLSI) proposed in 1999 and continued recommending H. pylori breakpoints only for clarithromycin and using an agar dilution.<a class="elsevierStyleCrossRef" href="#bib0130">5</a> The British Society for Antimicrobial Chemotherapy proposed the Epsilometer test (E-test)<a class="elsevierStyleCrossRef" href="#bib0135">6</a> and recommended breakpoints for four antimicrobials. Several studies conducted by the European Helicobacter pylori Study Group also used the E-test and proposed breakpoints for six antimicrobials.<a class="elsevierStyleCrossRef" href="#bib0140">7</a>The European Committee for Antimicrobial Susceptibility Testing (EUCAST) was initiated by the European Society of Clinical Microbiology and Infectious Diseases (ESCMID) to harmonize minimum inhibitory concentration (MIC) breakpoints across Europe.<a class="elsevierStyleCrossRef" href="#bib0145">8</a> In March–April 2011 the EUCAST group proposed breakpoints for six antimicrobials used to treat H. pylori.<a class="elsevierStyleCrossRef" href="#bib0150">9</a> The breakpoints are based on the epidemiological cut-off value (ECOFF), on clinical validation or on the study of resistance mechanisms.The adoption of new guidelines or changes in breakpoints can have an important effect on antimicrobial-resistance surveillance.<a class="elsevierStyleCrossRef" href="#bib0155">10</a>The aim of this study was to determine the resistance percentage in H. pylori clinical isolates using EUCAST breakpoints comparing the results obtained with others previously used. MIC value distribution in H. pylori clinical isolates was also studied.MethodsPatients and H. pylori strains824 H. pylori strains were isolated from antral gastric mucosal biopsy specimens obtained from symptomatic patients from January 1, 2007 to December 2014. 641 (77.8%) were children (median age 8.99±3.3) and 183 (22.2%) were adults (median age 43.1±15.9). 59.1% were females and 46.8% were males. No data of previous eradication treatment were available.Biopsies were cultured in selective and non-selective media obtained commercially (Blood-supplemented Columbia Agar plates and Pylori agar, BioMerieux). H. pylori strains were cultured under microaerobic conditions obtained in an anaerobiosis jar with a microaerobic gas-generating envelopment. Strains were identified by colony and Gram stain morphology, and urease, oxidase and catalase positive test. From November 2012, any strain with a rare resistance was confirmed to be H. pylori by MALDI-TOF.Susceptibility methodsSusceptibility to amoxicillin (AMX), tetracycline (TET), metronidazole (MET), clarithromycin (CLA), rifampicin (RIF) and levofloxacin (LEV) was performed by the E-test.<a class="elsevierStyleCrossRef" href="#bib0140">7</a> The bacteria were subcultured for 48h in Blood-supplemented Columbia agar and a bacterial suspension adjusted to 107CFU/mL was inoculated directly onto Mueller-Hinton agar supplemented with 5% sheep blood obtained commercially (bioMerieux).E-test was applied over the culture media within 30min of inoculation. Plates containing the E-test were incubated under microaerobic atmosphere. After 72h of incubation, the Minimal Inhibitory Concentration (MIC) was determined by considering the point were elipse growth cut with the scale number in the E-test strip.To analyze the data each MIC value was adjusted to the next higher twofold dilutions (as studied by broth microdilution or agar dilution).Interpretative criteriaThe MICs obtained in the entire period were analyzed according to the breakpoints previously used and to EUCAST breakpoints (<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>).<a class="elsevierStyleCrossRefs" href="#bib0130">5,6,9,11,12</a><elsevierMultimedia ident="tbl0005"></elsevierMultimedia>Statistical analysis95% Confidence intervals (95%CI) of prevalence rates were calculated. Data were analyzed using EpiInfo 6.04 (CDC, USA) computer software.ResultsThe percentage of strains that are susceptible, intermediate or resistant by using the EUCAST breakpoints and the previously used breakpoints is in <a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>. The overall percentage of resistance to the 6 antibiotics by the new EUCAST breakpoints and by the previous breakpoints was 8.5% and 3.2% for amoxicillin, 0.6% and 0.1% for tetracycline, 39.2% and 39.7% for metronidazole, 51.2% and 51.2% for clarithromycin, 32% and 3.1% for rifampicin and 6.7% and 6.7% for levofloxacin.The distributions of MICs for amoxicillin, tetracycline, metronidazole, clarithromycin, rifampicin and levofloxacin in H. pylori clinical isolates are shown in <a class="elsevierStyleCrossRef" href="#fig0005">Fig. 1</a>.<elsevierMultimedia ident="fig0005"></elsevierMultimedia>DiscussionSeveral triple or quadruple therapies are recommended for treatment of H. pylori infection, those being omeprazole, clarithromycin and amoxicillin which are the most frequently used. However, infection by a clarithromycin-resistant strain is a risk factor for treatment failure<a class="elsevierStyleCrossRef" href="#bib0170">13</a> and other antimicrobial agents used are tetracycline, metronidazole, levofloxacin or rifabutin.<a class="elsevierStyleCrossRef" href="#bib0175">14</a> Treatment for H. pylori infection is usually started on an empirical basis, and when an infecting strain is resistant to the antimicrobial agents used, its successful eradication is hampered.The amoxicillin breakpoint, proposed by EUCAST, was based on the epidemiological cut-off value although no evidence exists which determines whether treatment is successful for infections caused by isolates with MICs >0.12mg/L. Metronidazole cut-off was the current and widely accepted breakpoint, but there is no clinical validation. Clarithromycin breakpoints have been clinically validated and isolates with MIC above 0.5mg/L have a resistance mechanism (23S RNA mutation). Tetracycline breakpoint correlates with mutations in 16S RNA, levofloxacin breakpoint with gyrA mutations, and rifampicin breakpoint with rpoB mutation, although there are no outcome data and there is no clinical validation.<a class="elsevierStyleCrossRef" href="#bib0150">9</a>EUCAST guidelines for antimicrobial susceptibility testing (AST) are being implemented in European Laboratories.<a class="elsevierStyleCrossRef" href="#bib0180">15</a> Adoption of new guidelines and breakpoints can have a significant effect on reports and prior to implementing new guidelines, the consequences should be considered to prevent misunderstandings in interpretations. In this study AST's interpretation of the EUCAST breakpoint compared with the previous one was investigated and EUCAST will lead to significantly more isolates of H. pylori being resistant to rifampicin and amoxicillin. However, there are no important changes with the rest of the antimicrobial agents used for treatment of this infection, A total of 8.5% of the strains were amoxicillin-resistant when using the EUCAST breakpoints compared with 3.2% for the previous breakpoints. Amoxicillin is included in most treatments, such as sequential, concomitant and hybrid treatment; resistance to this antibiotic is clinically important and requires attention. On the other hand, there are no clinical data to confirm if strains with MIC of 0.25–0.5mg/L, although they are amoxicillin-resistant according to EUCAST breakpoints, could be eliminated with oral amoxicillin of 1g/12h. In our study most of the amoxicillin-resistant strains had low MICs.In the study done by Kim et al.<a class="elsevierStyleCrossRef" href="#bib0185">16</a> no amoxicillin breakpoint was used to categorized the strains, although 5.6% of strains studied in 1994 and 18.5% of the strains studied in 2003 had MIC >0.5mg/L. Moreover, two of these strains in 1994 and 3 in 2003 had an MIC of 8mg/L. Wu et al.<a class="elsevierStyleCrossRef" href="#bib0190">17</a> reported a surprisingly high prevalence of amoxicillin resistance using a breakpoint of >0.5mg/L, 71.9%, with 115 out of 153 being higher than 0.125 and 44 strains with MIC >16mg/l.An increase of the resistance to tetracycline has been described by Kim et al.<a class="elsevierStyleCrossRef" href="#bib0185">16</a> reporting a resistance rate of a 5.9% in 1987 and 12.3% in 2003 with MICs >4mg/L. Moreover, Wu et al.<a class="elsevierStyleCrossRef" href="#bib0190">17</a> reported a surprisingly high prevalence of tetracycline resistance, 58.8% by using a breakpoint of >16, with 104 out of 153 being higher than 1 and 79 strains with MIC >32mg/l.Metronidazole has been widely prescribed for infections such as parasitic or female genital infections and could contribute to the high resistance rate found everywhere.In a European Study using the new EUCAST breakpoints, H. pylori resistance rates for adults were 17.5% for clarithromycin, 14.1% for levofloxacin and 34.9% for metronidazole, and were higher for clarithromycin and levofloxacin in Western/Central and Southern Europe (resistance was higher than 20%) than those in Northern European countries (resistance lower than 10%).<a class="elsevierStyleCrossRef" href="#bib0195">18</a> Moreover, an association was found between outpatient quinolone use and the proportion of levofloxacin resistance and between the use of long-acting macrolides and clarithromycin resistance.MIC distribution of the strains tested according to the MIC value was bimodal for metronidazole and clarithromycin, whilst a continuous distribution was observed for amoxicillin, tetracycline, rifampicin and levofloxacin. The wild type population is the subpopulation of isolates with no detectable acquired resistance mechanisms,<a class="elsevierStyleCrossRefs" href="#bib0200">19,20</a> but the mechanism of resistance was not studied herein.There is a need for continuous surveillance of resistance to antimicrobial agents in H. pylori infections as well as in other infections. The knowledge of the breakpoints used in each study is mandatory when comparing data obtained from different studies.Recently Boyanova et al.<a class="elsevierStyleCrossRef" href="#bib0210">21</a> compared EUCAST with previously used breakpoint in 299 strains in Bulgaria and found similar results: although there were differences for 3 of the antibiotics tested, the differences in the resistant percentage was lower than 4%. Unfortunately, rifampicin resistance is determined only with EUCAST.According to the results of this study, no matter which breakpoint was used, similar results were found for the antibiotics with high clinical relevance, whilst there were differences with amoxicillin and rifampicin.Conflict of interestNone declared." "textoCompletoSecciones" => array:1 [ "secciones" => array:11 [ 0 => array:3 [ "identificador" => "xres1012321" "titulo" => "Abstract" "secciones" => array:4 [ 0 => array:2 [ "identificador" => "abst0005" "titulo" => "Introduction" ] 1 => array:2 [ "identificador" => "abst0010" "titulo" => "Methods" ] 2 => array:2 [ "identificador" => "abst0015" "titulo" => "Results" ] 3 => array:2 [ "identificador" => "abst0020" "titulo" => "Conclusions" ] ] ] 1 => array:2 [ "identificador" => "xpalclavsec971488" "titulo" => "Keywords" ] 2 => array:3 [ "identificador" => "xres1012322" "titulo" => "Resumen" "secciones" => array:4 [ 0 => array:2 [ "identificador" => "abst0025" "titulo" => "Introducción" ] 1 => array:2 [ "identificador" => "abst0030" "titulo" => "Métodos" ] 2 => array:2 [ "identificador" => "abst0035" "titulo" => "Resultados" ] 3 => array:2 [ "identificador" => "abst0040" "titulo" => "Conclusión" ] ] ] 3 => array:2 [ "identificador" => "xpalclavsec971489" "titulo" => "Palabras clave" ] 4 => array:2 [ "identificador" => "sec0005" "titulo" => "Introduction" ] 5 => array:3 [ "identificador" => "sec0010" "titulo" => "Methods" "secciones" => array:4 [ 0 => array:2 [ "identificador" => "sec0015" "titulo" => "Patients and H. pylori strains" ] 1 => array:2 [ "identificador" => "sec0020" "titulo" => "Susceptibility methods" ] 2 => array:2 [ "identificador" => "sec0025" "titulo" => "Interpretative criteria" ] 3 => array:2 [ "identificador" => "sec0030" "titulo" => "Statistical analysis" ] ] ] 6 => array:2 [ "identificador" => "sec0035" "titulo" => "Results" ] 7 => array:2 [ "identificador" => "sec0040" "titulo" => "Discussion" ] 8 => array:2 [ "identificador" => "sec0045" "titulo" => "Conflict of interest" ] 9 => array:2 [ "identificador" => "xack341476" "titulo" => "Acknowledgement" ] 10 => array:1 [ "titulo" => "References" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2015-11-17" "fechaAceptado" => "2016-02-09" "PalabrasClave" => array:2 [ "en" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Keywords" "identificador" => "xpalclavsec971488" "palabras" => array:3 [ 0 => "Clarithromycin resistance" 1 => "EUCAST breakpoints" 2 => "Multi-resistance" ] ] ] "es" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Palabras clave" "identificador" => "xpalclavsec971489" "palabras" => array:3 [ 0 => "Helicobacter pylori" 1 => "Resistencia a Claritromicina" 2 => "Punto de corte EUCAST" ] ] ] ] "tieneResumen" => true "resumen" => array:2 [ "en" => array:3 [ "titulo" => "Abstract" "resumen" => "IntroductionThe aim of this study was to determine the differences in percentage resistance in H. pylori clinical isolates using EUCAST breakpoints compared with previously used breakpoints. MIC value distribution in H. pylori clinical isolates was also studied. MethodsSusceptibility to amoxicillin, tetracycline, metronidazole, clarithromycin, rifampicin and levofloxacin was performed by E-test in 824 H. pylori clinical isolates. EUCAST and previous breakpoints defined resistance as follows: MIC >0.12mg/L and ≥2mg/L for amoxicillin, >8mg/L and ≥8mg/L for metronidazole, >0.5mg/L and ≥1mg/L for clarithromycin, >1mg/L and ≥32mg/L for rifampicin, and >1mg/L and ≥4mg/L for tetracycline and >1mg/L levofloxacin. ResultsOverall resistance rate by EUCAST and by previous breakpoints was 8.5% and 3.2% for amoxicillin, 0.6% and 0.1% for tetracycline, 39.2% and 39.7% for metronidazole, 51.2% and 51.2% for clarithromycin, 32% and 3.1% for rifampicin, and 6.7% and 6.7% for levofloxacin. ConclusionsWhen using the different breakpoints for antimicrobial susceptibility testing, similar results were found with most antibiotics tested (tetracycline, metronidazole, clarithromycin, and levofloxacin), except for amoxicillin and rifampicin." "secciones" => array:4 [ 0 => array:2 [ "identificador" => "abst0005" "titulo" => "Introduction" ] 1 => array:2 [ "identificador" => "abst0010" "titulo" => "Methods" ] 2 => array:2 [ "identificador" => "abst0015" "titulo" => "Results" ] 3 => array:2 [ "identificador" => "abst0020" "titulo" => "Conclusions" ] ] ] "es" => array:3 [ "titulo" => "Resumen" "resumen" => "IntroducciónEl objetivo de este estudio era determinar las diferencias en el porcentaje de resistencia de aislamientos clínicos de H. pylori usando los puntos de corte de EUCAST comparado con los puntos de corte usados anteriormente. También se estudió la distribución de los valores de CMI en los aislamientos de H. pylori. MétodosLa sensibilidad de amoxicilina, tetraciclina, metronidazol, claritromicina, rifampicina y levo-floxacina se determinó mediante E-test en 824 aislamientos clínicos de H. pylori. Los puntos de corte utilizados fueron EUCAST: CMI >0,12mg/L para amoxicilina, >8mg/L para metronidazol, >0,5mg/L para claritromicina y >1mg/L para rifampicina, tetraciclina y levofloxacina. Los puntos de corte que se habían utilizado antes de EUCAST fueron: CMI ≥2mg/L para amoxicilina, ≥8mg/L para metronidazol, ≥1mg/L para claritromicina, ≥32mg/L para rifampicina, ≥4mg/L para tetraciclina y >1mg/L para levofloxacina. ResultadosLa resistencia global con los puntos de corte EUCAST y con los puntos de corte anteriores fue: 8,5% y 3,2% para amoxicilina, 0,6% y 0,1% para tetraciclina, 39,2% y 39,7% para metronidazol, 51,2% y 51,2% para claritromicina, 32% y 3,1% para rifampicina y 6,7% y 6,7% para levofloxacina. ConclusiónA pesar de la utilización de diferentes puntos de corte, se obtuvieron resultados de resistencia similares para la mayoría de los antibióticos probados (tetraciclina, metronidazol, claritrnnñomicina, y levofloxacino), con la única excepción de amoxicilina y rifampicina." "secciones" => array:4 [ 0 => array:2 [ "identificador" => "abst0025" "titulo" => "Introducción" ] 1 => array:2 [ "identificador" => "abst0030" "titulo" => "Métodos" ] 2 => array:2 [ "identificador" => "abst0035" "titulo" => "Resultados" ] 3 => array:2 [ "identificador" => "abst0040" "titulo" => "Conclusión" ] ] ] ] "NotaPie" => array:1 [ 0 => array:2 [ "etiqueta" => "☆" "nota" => "This work has enjoyed the cooperation of the Research Fund Health FIS 08/1775 (Institute of Health Carlos III, Ministry of Economy and Competitiveness)." ] ] "multimedia" => array:4 [ 0 => array:7 [ "identificador" => "fig0005" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 2701 "Ancho" => 2542 "Tamanyo" => 361966 ] ] "descripcion" => array:1 [ "en" => "Distribution of antibiotic MICs for H. pylori clinical isolates. MICs were determined by E-Test and adjusted to the highest two-fold dilution values. MICs of amoxicillin (A) tetracycline (B), metronidazole (C), clarithromycin (D), rifampicin (E) and levofloxacin (F) are shown. Filled arrows indicate the EUCAST resistance breakpoints and dashed arrows the previously used breakpoints. Exe Y shows the number of H. pylori isolates for each MIC value and Exe X shows each MIC value (mg/L). Arrows indicates the EUCAST (<elsevierMultimedia ident="201804050444524911"></elsevierMultimedia>) or previous (<elsevierMultimedia ident="201804050444524912"></elsevierMultimedia>) resistance breakpoint." ] ] 1 => array:8 [ "identificador" => "tbl0005" "etiqueta" => "Table 1" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at1" "detalle" => "Table " "rol" => "short" ] ] "tabla" => array:3 [ "leyenda" => "S=susceptible, I=Intermediate, R=resistant, ns=no significant." "tablatextoimagen" => array:1 [ 0 => array:2 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="table-head " align="" valign="top" scope="col"> \t\t\t\t\t\t\n \t\t\t\t</th><th class="td" title="table-head " colspan="4" align="center" valign="top" scope="col" style="border-bottom: 2px solid black">EUCAST Breakpoints</th><th class="td" title="table-head " colspan="4" align="center" valign="top" scope="col" style="border-bottom: 2px solid black">Previous Breakpoints</th><th class="td" title="table-head " align="left" valign="top" scope="col">P value \t\t\t\t\t\t\n \t\t\t\t</th></tr><tr title="table-row"><th class="td" title="table-head " align="" valign="top" scope="col" style="border-bottom: 2px solid black"> \t\t\t\t\t\t\n \t\t\t\t</th><th class="td" title="table-head " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Breakpoint9 S/R (MIC in mg/L) \t\t\t\t\t\t\n \t\t\t\t</th><th class="td" title="table-head " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">% S (CI) \t\t\t\t\t\t\n \t\t\t\t</th><th class="td" title="table-head " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">% I (CI) \t\t\t\t\t\t\n \t\t\t\t</th><th class="td" title="table-head " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">% R (CI) \t\t\t\t\t\t\n \t\t\t\t</th><th class="td" title="table-head " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Breakpoint S/R (MIC in mg/L) \t\t\t\t\t\t\n \t\t\t\t</th><th class="td" title="table-head " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">% S (CI) \t\t\t\t\t\t\n \t\t\t\t</th><th class="td" title="table-head " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">% I (CI) \t\t\t\t\t\t\n \t\t\t\t</th><th class="td" title="table-head " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">% R (CI) \t\t\t\t\t\t\n \t\t\t\t</th><th class="td" title="table-head " align="" valign="top" scope="col" style="border-bottom: 2px solid black"> \t\t\t\t\t\t\n \t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">AMX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top"><0.12/>0.12 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">91.5% (89.1–93.3%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="" valign="top"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">8.5% (6.6–11%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top"><1/>2<a class="elsevierStyleCrossRef" href="#tblfn0005">a</a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">96.8% (95.2–97.8%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top">0.4% (0.1–1.2%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">3.2% (2.1–5.4.7%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top"><0.01 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">TET \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top"><1/>1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">99.4% (98.5–99.7%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="" valign="top"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">0.6% (0.2–1.5%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top"><2/>4<a class="elsevierStyleCrossRef" href="#tblfn0005">a</a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">99.9% (99.1–99.9%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="" valign="top"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">0.1% (0.02–0.8%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top">ns \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">MET \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top"><8/>8 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">60.8% (57.4–64%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="" valign="top"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">39.2% (35.9–42.5%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top"><4/>8<a class="elsevierStyleCrossRef" href="#tblfn0005">a</a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">60.3% (56.9–63.6%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top">0.2% (0.1–0.8%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">39.7% (36.3–43%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top">ns \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">CLA \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top"><0.25/>0.5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">48.2% (44.8–51.6%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top">0.6% (0.2–1.4%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">51.2% (47.7–54.5%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top"><0.25/>1<a class="elsevierStyleCrossRef" href="#tblfn0010">b</a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">48.2% (44.8–52%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top">0.9% (0.4–1.9%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">51.2% (47.7–54.5%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top">ns \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">RIF \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top"><1/>1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">68% (64.4 –71.2%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="" valign="top"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">32% (28.7–35.5%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top"><32/>32<a class="elsevierStyleCrossRef" href="#tblfn0015">c</a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">96.9% (95.3–97.9%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="" valign="top"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">3.1% (2–4.6%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top"><0.01 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">LEV \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top"><1/>1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">93.3% (91.3–94.9%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="" valign="top"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">6.7% (5–8.7%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top"><1/>1<a class="elsevierStyleCrossRef" href="#tblfn0020">d</a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">93.3% (91.3–94.9%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="" valign="top"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="char" valign="top">6.7% (5–8.7%) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="left" valign="top">ns \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] "imagenFichero" => array:1 [ 0 => "xTab1714370.png" ] ] ] "notaPie" => array:4 [ 0 => array:3 [ "identificador" => "tblfn0005" "etiqueta" => "a" "nota" => "BSAC breakpoints.<a class="elsevierStyleCrossRef" href="#bib0135">6</a>" ] 1 => array:3 [ "identificador" => "tblfn0010" "etiqueta" => "b" "nota" => "CLSI and BSAC breakpoint.<a class="elsevierStyleCrossRefs" href="#bib0130">5,6</a>" ] 2 => array:3 [ "identificador" => "tblfn0015" "etiqueta" => "c" "nota" => "From Fujimura et al.<a class="elsevierStyleCrossRef" href="#bib0160">11</a>" ] 3 => array:3 [ "identificador" => "tblfn0020" "etiqueta" => "d" "nota" => "From Wueppenhorst et al.<a class="elsevierStyleCrossRef" href="#bib0165">12</a>" ] ] ] "descripcion" => array:1 [ "en" => "Assignment of H. pylori clinical isolates to interpretative categories according to the EUCAST breakpoint and the previous breakpoint (percentage and confidence interval, CI). 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Antimicrobial susceptibility of 6 antimicrobial agents in Helicobacter pylori clinical isolates by using EUCAST breakpoints compared with previously used breakpoints

Sensibilidad de aislamientos clínicos de Helicobacter pylori a seis antimicrobianos utilizando los criterios EUCAST y comparando los resultados con criterios utilizados anteriormente

Teresa Alarcóna,b,

Corresponding author

talarcon@helicobacterspain.com

Corresponding author.

, Pedro Urruzunoc, Maria Josefa Martínezd, Diego Domingoa, Laura Llorcaa, Ana Correaa, Manuel López-Breaa

a Servicio de Microbiologia, Hospital Universitario de la Princesa, Instituto de Investigación Sanitaria Princesa (IIS-IP), Madrid, Spain

b Departamento de Medicina Preventiva, Salud Pública y Microbiologia, Facultad de Medicina, Universidad Autónoma de Madrid, Spain

c Unidad de Gastroenterología Pediátrica, Hospital Universitario Doce de Octubre, Instituto de Investigación Hospital 12 de Octubre, Madrid, Spain

d Unidad de Gastroenterología Pediátrica, Hospital Universitario Niño Jesus, Instituto de Investigación Sanitaria Princesa (IIS-IP), Madrid, Spain

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        "titulo" => "Sensibilidad de aislamientos cl&#237;nicos de <span class="elsevierStyleItalic">Helicobacter pylori</span> a seis antimicrobianos utilizando los criterios EUCAST y comparando los resultados con criterios utilizados anteriormente"
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          "en" => "<p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">Distribution of antibiotic MICs for <span class="elsevierStyleItalic">H&#46; pylori</span> clinical isolates&#46; MICs were determined by E-Test and adjusted to the highest two-fold dilution values&#46; MICs of amoxicillin &#40;A&#41; tetracycline &#40;B&#41;&#44; metronidazole &#40;C&#41;&#44; clarithromycin &#40;D&#41;&#44; rifampicin &#40;E&#41; and levofloxacin &#40;F&#41; are shown&#46; Filled arrows indicate the EUCAST resistance breakpoints and dashed arrows the previously used breakpoints&#46; Exe Y shows the number of <span class="elsevierStyleItalic">H&#46; pylori</span> isolates for each MIC value and Exe X shows each MIC value &#40;mg&#47;L&#41;&#46; Arrows indicates the EUCAST &#40;<elsevierMultimedia ident="201804050444524911"></elsevierMultimedia>&#41; or previous &#40;<elsevierMultimedia ident="201804050444524912"></elsevierMultimedia>&#41; resistance breakpoint&#46;</p>"
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Helicobacter pylori</span> is a Gram-negative spiral rod colonizing the gastric mucosa mainly at the antrum&#44; producing gastric inflammation&#46; Patient could remain without symptomatology for his o her whole life or develop several pathologies such as duodenal or gastric ulcer&#59; mucosa-associated lymphoid tissue &#40;MALT&#41; or gastric cancer&#46;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">1</span></a> Association with non-digestive diseases has also been described&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">2</span></a> When treatment is needed&#44; several triple or quadruple therapies could be used&#46; Amoxicillin&#44; tetracycline&#44; metronidazole and clarithromycin are the antimicrobials most frequently used combined with proton pump inhibitors or bismuth salts&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">3</span></a> Several papers have stressed the importance of doing <span class="elsevierStyleItalic">H&#46; pylori</span> susceptibility testing before administering the treatment&#46;<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">4</span></a> However&#44; different methodology could be performed for <span class="elsevierStyleItalic">in vitro</span> susceptibility testing&#46; Several Societies and Committees have defined reference methods and breakpoints for categorized organisms as susceptible or resistant to antimicrobial agents&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">The National Committee for Clinical Laboratory Standard &#40;NCCLS&#41; &#40;now the Clinical and Laboratory Standards Institute&#44; CLSI&#41; proposed in 1999 and continued recommending <span class="elsevierStyleItalic">H&#46; pylori</span> breakpoints only for clarithromycin and using an agar dilution&#46;<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">5</span></a> The British Society for Antimicrobial Chemotherapy proposed the Epsilometer test &#40;E-test&#41;<a class="elsevierStyleCrossRef" href="#bib0135"><span class="elsevierStyleSup">6</span></a> and recommended breakpoints for four antimicrobials&#46; Several studies conducted by the European <span class="elsevierStyleItalic">Helicobacter pylori</span> Study Group also used the E-test and proposed breakpoints for six antimicrobials&#46;<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">7</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">The European Committee for Antimicrobial Susceptibility Testing &#40;EUCAST&#41; was initiated by the European Society of Clinical Microbiology and Infectious Diseases &#40;ESCMID&#41; to harmonize minimum inhibitory concentration &#40;MIC&#41; breakpoints across Europe&#46;<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">8</span></a> In March&#8211;April 2011 the EUCAST group proposed breakpoints for six antimicrobials used to treat <span class="elsevierStyleItalic">H&#46; pylori&#46;</span><a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">9</span></a> The breakpoints are based on the epidemiological cut-off value &#40;ECOFF&#41;&#44; on clinical validation or on the study of resistance mechanisms&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">The adoption of new guidelines or changes in breakpoints can have an important effect on antimicrobial-resistance surveillance&#46;<a class="elsevierStyleCrossRef" href="#bib0155"><span class="elsevierStyleSup">10</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">The aim of this study was to determine the resistance percentage in <span class="elsevierStyleItalic">H&#46; pylori</span> clinical isolates using EUCAST breakpoints comparing the results obtained with others previously used&#46; MIC value distribution in <span class="elsevierStyleItalic">H&#46; pylori</span> clinical isolates was also studied&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Methods</span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Patients and <span class="elsevierStyleItalic">H&#46; pylori</span> strains</span><p id="par0030" class="elsevierStylePara elsevierViewall">824 <span class="elsevierStyleItalic">H&#46; pylori</span> strains were isolated from antral gastric mucosal biopsy specimens obtained from symptomatic patients from January 1&#44; 2007 to December 2014&#46; 641 &#40;77&#46;8&#37;&#41; were children &#40;median age 8&#46;99<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#46;3&#41; and 183 &#40;22&#46;2&#37;&#41; were adults &#40;median age 43&#46;1<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>15&#46;9&#41;&#46; 59&#46;1&#37; were females and 46&#46;8&#37; were males&#46; No data of previous eradication treatment were available&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">Biopsies were cultured in selective and non-selective media obtained commercially &#40;Blood-supplemented Columbia Agar plates and Pylori agar&#44; BioMerieux&#41;&#46; <span class="elsevierStyleItalic">H&#46; pylori</span> strains were cultured under microaerobic conditions obtained in an anaerobiosis jar with a microaerobic gas-generating envelopment&#46; Strains were identified by colony and Gram stain morphology&#44; and urease&#44; oxidase and catalase positive test&#46; From November 2012&#44; any strain with a rare resistance was confirmed to be <span class="elsevierStyleItalic">H&#46; pylori</span> by MALDI-TOF&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Susceptibility methods</span><p id="par0040" class="elsevierStylePara elsevierViewall">Susceptibility to amoxicillin &#40;AMX&#41;&#44; tetracycline &#40;TET&#41;&#44; metronidazole &#40;MET&#41;&#44; clarithromycin &#40;CLA&#41;&#44; rifampicin &#40;RIF&#41; and levofloxacin &#40;LEV&#41; was performed by the E-test&#46;<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">7</span></a> The bacteria were subcultured for 48<span class="elsevierStyleHsp" style=""></span>h in Blood-supplemented Columbia agar and a bacterial suspension adjusted to 10<span class="elsevierStyleSup">7</span><span class="elsevierStyleHsp" style=""></span>CFU&#47;mL was inoculated directly onto Mueller-Hinton agar supplemented with 5&#37; sheep blood obtained commercially &#40;bioMerieux&#41;&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">E-test was applied over the culture media within 30<span class="elsevierStyleHsp" style=""></span>min of inoculation&#46; Plates containing the E-test were incubated under microaerobic atmosphere&#46; After 72<span class="elsevierStyleHsp" style=""></span>h of incubation&#44; the Minimal Inhibitory Concentration &#40;MIC&#41; was determined by considering the point were elipse growth cut with the scale number in the E-test strip&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">To analyze the data each MIC value was adjusted to the next higher twofold dilutions &#40;as studied by broth microdilution or agar dilution&#41;&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Interpretative criteria</span><p id="par0055" class="elsevierStylePara elsevierViewall">The MICs obtained in the entire period were analyzed according to the breakpoints previously used and to EUCAST breakpoints &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0130"><span class="elsevierStyleSup">5&#44;6&#44;9&#44;11&#44;12</span></a></p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Statistical analysis</span><p id="par0060" class="elsevierStylePara elsevierViewall">95&#37; Confidence intervals &#40;95&#37;CI&#41; of prevalence rates were calculated&#46; Data were analyzed using EpiInfo 6&#46;04 &#40;CDC&#44; USA&#41; computer software&#46;</p></span></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0095">Results</span><p id="par0065" class="elsevierStylePara elsevierViewall">The percentage of strains that are susceptible&#44; intermediate or resistant by using the EUCAST breakpoints and the previously used breakpoints is in <a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#46; The overall percentage of resistance to the 6 antibiotics by the new EUCAST breakpoints and by the previous breakpoints was 8&#46;5&#37; and 3&#46;2&#37; for amoxicillin&#44; 0&#46;6&#37; and 0&#46;1&#37; for tetracycline&#44; 39&#46;2&#37; and 39&#46;7&#37; for metronidazole&#44; 51&#46;2&#37; and 51&#46;2&#37; for clarithromycin&#44; 32&#37; and 3&#46;1&#37; for rifampicin and 6&#46;7&#37; and 6&#46;7&#37; for levofloxacin&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">The distributions of MICs for amoxicillin&#44; tetracycline&#44; metronidazole&#44; clarithromycin&#44; rifampicin and levofloxacin in <span class="elsevierStyleItalic">H&#46; pylori</span> clinical isolates are shown in <a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Discussion</span><p id="par0075" class="elsevierStylePara elsevierViewall">Several triple or quadruple therapies are recommended for treatment of <span class="elsevierStyleItalic">H&#46; pylori</span> infection&#44; those being omeprazole&#44; clarithromycin and amoxicillin which are the most frequently used&#46; However&#44; infection by a clarithromycin-resistant strain is a risk factor for treatment failure<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">13</span></a> and other antimicrobial agents used are tetracycline&#44; metronidazole&#44; levofloxacin or rifabutin&#46;<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">14</span></a> Treatment for <span class="elsevierStyleItalic">H&#46; pylori</span> infection is usually started on an empirical basis&#44; and when an infecting strain is resistant to the antimicrobial agents used&#44; its successful eradication is hampered&#46;</p><p id="par0080" class="elsevierStylePara elsevierViewall">The amoxicillin breakpoint&#44; proposed by EUCAST&#44; was based on the epidemiological cut-off value although no evidence exists which determines whether treatment is successful for infections caused by isolates with MICs &#62;0&#46;12<span class="elsevierStyleHsp" style=""></span>mg&#47;L&#46; Metronidazole cut-off was the current and widely accepted breakpoint&#44; but there is no clinical validation&#46; Clarithromycin breakpoints have been clinically validated and isolates with MIC above 0&#46;5<span class="elsevierStyleHsp" style=""></span>mg&#47;L have a resistance mechanism &#40;23S RNA mutation&#41;&#46; Tetracycline breakpoint correlates with mutations in 16S RNA&#44; levofloxacin breakpoint with <span class="elsevierStyleItalic">gyrA</span> mutations&#44; and rifampicin breakpoint with <span class="elsevierStyleItalic">rpoB</span> mutation&#44; although there are no outcome data and there is no clinical validation&#46;<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">9</span></a></p><p id="par0085" class="elsevierStylePara elsevierViewall">EUCAST guidelines for antimicrobial susceptibility testing &#40;AST&#41; are being implemented in European Laboratories&#46;<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">15</span></a> Adoption of new guidelines and breakpoints can have a significant effect on reports and prior to implementing new guidelines&#44; the consequences should be considered to prevent misunderstandings in interpretations&#46; In this study AST&#39;s interpretation of the EUCAST breakpoint compared with the previous one was investigated and EUCAST will lead to significantly more isolates of <span class="elsevierStyleItalic">H&#46; pylori</span> being resistant to rifampicin and amoxicillin&#46; However&#44; there are no important changes with the rest of the antimicrobial agents used for treatment of this infection&#44; A total of 8&#46;5&#37; of the strains were amoxicillin-resistant when using the EUCAST breakpoints compared with 3&#46;2&#37; for the previous breakpoints&#46; Amoxicillin is included in most treatments&#44; such as sequential&#44; concomitant and hybrid treatment&#59; resistance to this antibiotic is clinically important and requires attention&#46; On the other hand&#44; there are no clinical data to confirm if strains with MIC of 0&#46;25&#8211;0&#46;5<span class="elsevierStyleHsp" style=""></span>mg&#47;L&#44; although they are amoxicillin-resistant according to EUCAST breakpoints&#44; could be eliminated with oral amoxicillin of 1<span class="elsevierStyleHsp" style=""></span>g&#47;12<span class="elsevierStyleHsp" style=""></span>h&#46; In our study most of the amoxicillin-resistant strains had low MICs&#46;</p><p id="par0090" class="elsevierStylePara elsevierViewall">In the study done by Kim et al&#46;<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">16</span></a> no amoxicillin breakpoint was used to categorized the strains&#44; although 5&#46;6&#37; of strains studied in 1994 and 18&#46;5&#37; of the strains studied in 2003 had MIC &#62;0&#46;5<span class="elsevierStyleHsp" style=""></span>mg&#47;L&#46; Moreover&#44; two of these strains in 1994 and 3 in 2003 had an MIC of 8<span class="elsevierStyleHsp" style=""></span>mg&#47;L&#46; Wu et al&#46;<a class="elsevierStyleCrossRef" href="#bib0190"><span class="elsevierStyleSup">17</span></a> reported a surprisingly high prevalence of amoxicillin resistance using a breakpoint of &#62;0&#46;5<span class="elsevierStyleHsp" style=""></span>mg&#47;L&#44; 71&#46;9&#37;&#44; with 115 out of 153 being higher than 0&#46;125 and 44 strains with MIC &#62;16<span class="elsevierStyleHsp" style=""></span>mg&#47;l&#46;</p><p id="par0095" class="elsevierStylePara elsevierViewall">An increase of the resistance to tetracycline has been described by Kim et al&#46;<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">16</span></a> reporting a resistance rate of a 5&#46;9&#37; in 1987 and 12&#46;3&#37; in 2003 with MICs &#62;4<span class="elsevierStyleHsp" style=""></span>mg&#47;L&#46; Moreover&#44; Wu et al&#46;<a class="elsevierStyleCrossRef" href="#bib0190"><span class="elsevierStyleSup">17</span></a> reported a surprisingly high prevalence of tetracycline resistance&#44; 58&#46;8&#37; by using a breakpoint of &#62;16&#44; with 104 out of 153 being higher than 1 and 79 strains with MIC &#62;32<span class="elsevierStyleHsp" style=""></span>mg&#47;l&#46;</p><p id="par0100" class="elsevierStylePara elsevierViewall">Metronidazole has been widely prescribed for infections such as parasitic or female genital infections and could contribute to the high resistance rate found everywhere&#46;</p><p id="par0105" class="elsevierStylePara elsevierViewall">In a European Study using the new EUCAST breakpoints&#44; <span class="elsevierStyleItalic">H&#46; pylori</span> resistance rates for adults were 17&#46;5&#37; for clarithromycin&#44; 14&#46;1&#37; for levofloxacin and 34&#46;9&#37; for metronidazole&#44; and were higher for clarithromycin and levofloxacin in Western&#47;Central and Southern Europe &#40;resistance was higher than 20&#37;&#41; than those in Northern European countries &#40;resistance lower than 10&#37;&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0195"><span class="elsevierStyleSup">18</span></a> Moreover&#44; an association was found between outpatient quinolone use and the proportion of levofloxacin resistance and between the use of long-acting macrolides and clarithromycin resistance&#46;</p><p id="par0110" class="elsevierStylePara elsevierViewall">MIC distribution of the strains tested according to the MIC value was bimodal for metronidazole and clarithromycin&#44; whilst a continuous distribution was observed for amoxicillin&#44; tetracycline&#44; rifampicin and levofloxacin&#46; The wild type population is the subpopulation of isolates with no detectable acquired resistance mechanisms&#44;<a class="elsevierStyleCrossRefs" href="#bib0200"><span class="elsevierStyleSup">19&#44;20</span></a> but the mechanism of resistance was not studied herein&#46;</p><p id="par0115" class="elsevierStylePara elsevierViewall">There is a need for continuous surveillance of resistance to antimicrobial agents in <span class="elsevierStyleItalic">H&#46; pylori</span> infections as well as in other infections&#46; The knowledge of the breakpoints used in each study is mandatory when comparing data obtained from different studies&#46;</p><p id="par0120" class="elsevierStylePara elsevierViewall">Recently Boyanova et al&#46;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">21</span></a> compared EUCAST with previously used breakpoint in 299 strains in Bulgaria and found similar results&#58; although there were differences for 3 of the antibiotics tested&#44; the differences in the resistant percentage was lower than 4&#37;&#46; Unfortunately&#44; rifampicin resistance is determined only with EUCAST&#46;</p><p id="par0125" class="elsevierStylePara elsevierViewall">According to the results of this study&#44; no matter which breakpoint was used&#44; similar results were found for the antibiotics with high clinical relevance&#44; whilst there were differences with amoxicillin and rifampicin&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0105">Conflict of interest</span><p id="par0130" class="elsevierStylePara elsevierViewall">None declared&#46;</p></span></span>"
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            0 => array:2 [
              "identificador" => "sec0015"
              "titulo" => "Patients and H&#46; pylori strains"
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              "identificador" => "sec0020"
              "titulo" => "Susceptibility methods"
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              "titulo" => "Interpretative criteria"
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              "titulo" => "Statistical analysis"
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          "titulo" => "Acknowledgement"
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          "titulo" => "References"
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    "pdfFichero" => "main.pdf"
    "tienePdf" => true
    "fechaRecibido" => "2015-11-17"
    "fechaAceptado" => "2016-02-09"
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          "clase" => "keyword"
          "titulo" => "Keywords"
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          "palabras" => array:3 [
            0 => "Clarithromycin resistance"
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            2 => "Multi-resistance"
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          "palabras" => array:3 [
            0 => "<span class="elsevierStyleItalic">Helicobacter pylori</span>"
            1 => "Resistencia a Claritromicina"
            2 => "Punto de corte EUCAST"
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    "resumen" => array:2 [
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        "titulo" => "Abstract"
        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Introduction</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">The aim of this study was to determine the differences in percentage resistance in <span class="elsevierStyleItalic">H&#46; pylori</span> clinical isolates using EUCAST breakpoints compared with previously used breakpoints&#46; MIC value distribution in <span class="elsevierStyleItalic">H&#46; pylori</span> clinical isolates was also studied&#46;</p></span> <span id="abst0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Methods</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Susceptibility to amoxicillin&#44; tetracycline&#44; metronidazole&#44; clarithromycin&#44; rifampicin and levofloxacin was performed by E-test in 824 <span class="elsevierStyleItalic">H&#46; pylori</span> clinical isolates&#46; EUCAST and previous breakpoints defined resistance as follows&#58; MIC &#62;0&#46;12<span class="elsevierStyleHsp" style=""></span>mg&#47;L and &#8805;2<span class="elsevierStyleHsp" style=""></span>mg&#47;L for amoxicillin&#44; &#62;8<span class="elsevierStyleHsp" style=""></span>mg&#47;L and &#8805;8<span class="elsevierStyleHsp" style=""></span>mg&#47;L for metronidazole&#44; &#62;0&#46;5<span class="elsevierStyleHsp" style=""></span>mg&#47;L and &#8805;1<span class="elsevierStyleHsp" style=""></span>mg&#47;L for clarithromycin&#44; &#62;1<span class="elsevierStyleHsp" style=""></span>mg&#47;L and &#8805;32<span class="elsevierStyleHsp" style=""></span>mg&#47;L for rifampicin&#44; and &#62;1<span class="elsevierStyleHsp" style=""></span>mg&#47;L and &#8805;4<span class="elsevierStyleHsp" style=""></span>mg&#47;L for tetracycline and &#62;1<span class="elsevierStyleHsp" style=""></span>mg&#47;L levofloxacin&#46;</p></span> <span id="abst0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Results</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Overall resistance rate by EUCAST and by previous breakpoints was 8&#46;5&#37; and 3&#46;2&#37; for amoxicillin&#44; 0&#46;6&#37; and 0&#46;1&#37; for tetracycline&#44; 39&#46;2&#37; and 39&#46;7&#37; for metronidazole&#44; 51&#46;2&#37; and 51&#46;2&#37; for clarithromycin&#44; 32&#37; and 3&#46;1&#37; for rifampicin&#44; and 6&#46;7&#37; and 6&#46;7&#37; for levofloxacin&#46;</p></span> <span id="abst0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Conclusions</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">When using the different breakpoints for antimicrobial susceptibility testing&#44; similar results were found with most antibiotics tested &#40;tetracycline&#44; metronidazole&#44; clarithromycin&#44; and levofloxacin&#41;&#44; except for amoxicillin and rifampicin&#46;</p></span>"
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        "resumen" => "<span id="abst0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Introducci&#243;n</span><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">El objetivo de este estudio era determinar las diferencias en el porcentaje de resistencia de aislamientos cl&#237;nicos de <span class="elsevierStyleItalic">H&#46; pylori</span> usando los puntos de corte de EUCAST comparado con los puntos de corte usados anteriormente&#46; Tambi&#233;n se estudi&#243; la distribuci&#243;n de los valores de CMI en los aislamientos de <span class="elsevierStyleItalic">H&#46; pylori</span>&#46;</p></span> <span id="abst0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">M&#233;todos</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">La sensibilidad de amoxicilina&#44; tetraciclina&#44; metronidazol&#44; claritromicina&#44; rifampicina y levo-floxacina se determin&#243; mediante E-test en 824 aislamientos cl&#237;nicos de <span class="elsevierStyleItalic">H&#46; pylori</span>&#46; Los puntos de corte utilizados fueron EUCAST&#58; CMI &#62;0&#44;12<span class="elsevierStyleHsp" style=""></span>mg&#47;L para amoxicilina&#44; &#62;8<span class="elsevierStyleHsp" style=""></span>mg&#47;L para metronidazol&#44; &#62;0&#44;5<span class="elsevierStyleHsp" style=""></span>mg&#47;L para claritromicina y &#62;1<span class="elsevierStyleHsp" style=""></span>mg&#47;L para rifampicina&#44; tetraciclina y levofloxacina&#46; Los puntos de corte que se hab&#237;an utilizado antes de EUCAST fueron&#58; CMI &#8805;2<span class="elsevierStyleHsp" style=""></span>mg&#47;L para amoxicilina&#44; &#8805;8<span class="elsevierStyleHsp" style=""></span>mg&#47;L para metronidazol&#44; &#8805;1<span class="elsevierStyleHsp" style=""></span>mg&#47;L para claritromicina&#44; &#8805;32<span class="elsevierStyleHsp" style=""></span>mg&#47;L para rifampicina&#44; &#8805;4<span class="elsevierStyleHsp" style=""></span>mg&#47;L para tetraciclina y &#62;1<span class="elsevierStyleHsp" style=""></span>mg&#47;L para levofloxacina&#46;</p></span> <span id="abst0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Resultados</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">La resistencia global con los puntos de corte EUCAST y con los puntos de corte anteriores fue&#58; 8&#44;5&#37; y 3&#44;2&#37; para amoxicilina&#44; 0&#44;6&#37; y 0&#44;1&#37; para tetraciclina&#44; 39&#44;2&#37; y 39&#44;7&#37; para metronidazol&#44; 51&#44;2&#37; y 51&#44;2&#37; para claritromicina&#44; 32&#37; y 3&#44;1&#37; para rifampicina y 6&#44;7&#37; y 6&#44;7&#37; para levofloxacina&#46;</p></span> <span id="abst0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Conclusi&#243;n</span><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">A pesar de la utilizaci&#243;n de diferentes puntos de corte&#44; se obtuvieron resultados de resistencia similares para la mayor&#237;a de los antibi&#243;ticos probados &#40;tetraciclina&#44; metronidazol&#44; claritrnn&#241;omicina&#44; y levofloxacino&#41;&#44; con la &#250;nica excepci&#243;n de amoxicilina y rifampicina&#46;</p></span>"
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        "nota" => "<p class="elsevierStyleNotepara" id="npar0025">This work has enjoyed the cooperation of the Research Fund Health FIS 08&#47;1775 &#40;Institute of Health Carlos III&#44; Ministry of Economy and Competitiveness&#41;&#46;</p>"
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          "en" => "<p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">Distribution of antibiotic MICs for <span class="elsevierStyleItalic">H&#46; pylori</span> clinical isolates&#46; MICs were determined by E-Test and adjusted to the highest two-fold dilution values&#46; MICs of amoxicillin &#40;A&#41; tetracycline &#40;B&#41;&#44; metronidazole &#40;C&#41;&#44; clarithromycin &#40;D&#41;&#44; rifampicin &#40;E&#41; and levofloxacin &#40;F&#41; are shown&#46; Filled arrows indicate the EUCAST resistance breakpoints and dashed arrows the previously used breakpoints&#46; Exe Y shows the number of <span class="elsevierStyleItalic">H&#46; pylori</span> isolates for each MIC value and Exe X shows each MIC value &#40;mg&#47;L&#41;&#46; Arrows indicates the EUCAST &#40;<elsevierMultimedia ident="201804050444524911"></elsevierMultimedia>&#41; or previous &#40;<elsevierMultimedia ident="201804050444524912"></elsevierMultimedia>&#41; resistance breakpoint&#46;</p>"
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                  \t\t\t\t</th><th class="td" title="table-head  " colspan="4" align="center" valign="top" scope="col" style="border-bottom: 2px solid black">EUCAST Breakpoints</th><th class="td" title="table-head  " colspan="4" align="center" valign="top" scope="col" style="border-bottom: 2px solid black">Previous Breakpoints</th><th class="td" title="table-head  " align="left" valign="top" scope="col"><span class="elsevierStyleItalic">P</span> value&nbsp;\t\t\t\t\t\t\n
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Article information

ISSN: 0213005X
Original language: English

DOI:10.1016/j.eimc.2016.02.010

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Year/Month	Html	Pdf	Total

2024 November	16	1	17
2024 October	70	12	82
2024 September	111	11	122
2024 August	91	9	100
2024 July	87	13	100
2024 June	68	13	81
2024 May	93	20	113
2024 April	76	28	104
2024 March	62	13	75
2024 February	81	12	93
2024 January	116	20	136
2023 December	127	23	150
2023 November	110	47	157
2023 October	136	35	171
2023 September	85	25	110
2023 August	75	13	88
2023 July	84	53	137
2023 June	88	39	127
2023 May	107	13	120
2023 April	64	11	75
2023 March	84	13	97
2023 February	72	4	76
2023 January	68	7	75
2022 December	56	20	76
2022 November	63	28	91
2022 October	52	20	72
2022 September	56	22	78
2022 August	74	14	88
2022 July	50	13	63
2022 June	53	16	69
2022 May	50	22	72
2022 April	46	27	73
2022 March	58	23	81
2022 February	50	12	62
2022 January	86	12	98
2021 December	65	22	87
2021 November	75	47	122
2021 October	65	26	91
2021 September	64	23	87
2021 August	78	19	97
2021 July	61	19	80
2021 June	49	12	61
2021 May	78	16	94
2021 April	206	20	226
2021 March	84	16	100
2021 February	85	13	98
2021 January	77	18	95
2020 December	64	13	77
2020 November	56	15	71
2020 October	43	12	55
2020 September	75	21	96
2020 August	76	25	101
2020 July	48	12	60
2020 June	47	17	64
2020 May	69	21	90
2020 April	52	10	62
2020 March	88	20	108
2020 February	73	24	97
2020 January	71	35	106
2019 December	75	38	113
2019 November	53	13	66
2019 October	60	11	71
2019 September	58	7	65
2019 August	55	6	61
2019 July	50	23	73
2019 June	92	40	132
2019 May	264	86	350
2019 April	107	35	142
2019 March	41	22	63
2019 February	30	19	49
2019 January	20	13	33
2018 December	25	13	38
2018 November	40	4	44
2018 October	36	27	63
2018 September	32	4	36
2018 August	14	4	18
2018 July	12	3	15
2018 June	14	6	20
2018 May	13	6	19
2018 April	224	1	225
2018 March	15	0	15
2018 February	7	1	8
2018 January	15	0	15
2017 December	12	2	14
2017 November	20	1	21
2017 October	18	0	18
2017 September	2	0	2
2017 July	2	0	2
2017 June	4	9	13
2017 May	80	81	161
2017 April	1	0	1
2017 March	2	0	2
2017 February	17	9	26
2017 January	7	6	13
2016 December	3	11	14
2016 November	3	13	16
2016 October	10	8	18
2016 September	6	8	14
2016 August	4	8	12
2016 July	1	4	5

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