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Original article
Multicausal etiology of the enteric syndrome in rabbits from Mexico
Multicausalidad del síndrome entérico en conejos de México
Virginia G. García-Rubioa, Linda G. Bautista-Gómeza,
Corresponding author
, José S. Martínez-Castañedab, Camilo Romero-Núñeza
a Centro Universitario UAEM Amecameca, Universidad Autónoma del Estado de México, Km 2.5 Carretera Amecameca-Ayapango, C.P. 56900 Amecameca, Estado de México, México
b Centro de Investigación y Estudios Avanzados en Salud Animal, Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma del Estado de México. Carretera de Cuota Toluca-Atlacomulco km 15.5, C.P. 50200, Toluca, Estado de México, México
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">The enteritis complex was introduced by Whitney in 1976 to designate a group of diseases that include mucoid enteritis&#44; typhlitis&#44; typhlitis-diarrhea and hemorrhagic enteritis&#46; Commonly observed symptoms include teeth grinding&#44; anorexia&#44; polydipsia&#44; weakness&#44; abdominal distension&#44; profuse diarrhea&#44; dehydration&#44; hypothermia and death<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">18</span></a>&#46; Enteropathies are recognized as a problem for domestic rabbits&#44; being their etiology and pathogenesis poorly understood<a class="elsevierStyleCrossRef" href="#bib0220"><span class="elsevierStyleSup">4</span></a>&#46; In commercial rabbit production&#44; enteropathies are hard to diagnose&#59; they can have a multifactorial etiology &#40;hence the term &#8220;multifactorial enteritis&#8221;&#41; and are also known as &#8220;enteric syndrome&#8221;<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">14</span></a>&#46; This syndrome is a pathological complex characterized by various stressing and pathogenic factors acting synergistically&#44; possessing varying degrees of virulence which can enhance their pathogenicity and cause damage to the intestinal tissue&#46; Numerous studies have reported the isolation of <span class="elsevierStyleItalic">Clostridium perfringens</span>&#44; <span class="elsevierStyleItalic">Clostridium piliformis</span>&#44; <span class="elsevierStyleItalic">Clostridium spiriforme</span>&#44; <span class="elsevierStyleItalic">Escherichia coli</span><a class="elsevierStyleCrossRefs" href="#bib0305"><span class="elsevierStyleSup">21&#44;35</span></a>&#44; <span class="elsevierStyleItalic">Salmonella</span> spp&#46;&#44; <span class="elsevierStyleItalic">Klebsiella</span> spp&#46;&#44; <span class="elsevierStyleItalic">Pseudomonas</span> spp&#46;&#44; Streptococcus <span class="elsevierStyleItalic">aureus</span>&#44; <span class="elsevierStyleItalic">Streptococcus</span> spp&#46;&#44; <span class="elsevierStyleItalic">Campylobacter</span> and <span class="elsevierStyleItalic">Eimeria</span> spp&#46;&#44;<a class="elsevierStyleCrossRefs" href="#bib0270"><span class="elsevierStyleSup">14&#44;19&#44;23&#44;24</span></a>&#46; Viruses seem to have an important but non-crucial role&#59; overall&#44; they are mild pathogens that do not induce severe clinical profiles<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">14</span></a>&#46; Rotavirus<a class="elsevierStyleCrossRef" href="#bib0280"><span class="elsevierStyleSup">16</span></a>&#44; Coronavirus<a class="elsevierStyleCrossRef" href="#bib0220"><span class="elsevierStyleSup">4</span></a>&#44; and Parvovirus<a class="elsevierStyleCrossRef" href="#bib0285"><span class="elsevierStyleSup">17</span></a> have been reported and it has been suggested that they could exert direct pathogenic activity by initiating the development of bacterial infections and&#47;or of other viral pathogens by inducing minimal alterations in the intestinal epithelium<a class="elsevierStyleCrossRef" href="#bib0285"><span class="elsevierStyleSup">17</span></a>&#46; Enteric diseases are important in rabbit production and cause severe economic losses&#44; due to high mortality indexes&#44; decrease in growth and reduction in the feed conversion ratio<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">14</span></a>&#46; Studies in Cuba&#44; Japan and Argentina have reported digestive pathologies as the main cause of mortality with percentages of 57&#46;9&#37;&#44; 48&#46;9&#37; and 43&#37; respectively<a class="elsevierStyleCrossRef" href="#bib0320"><span class="elsevierStyleSup">24</span></a>&#46; In Mexico there are few reports concerning the agents involved in these pathologies<a class="elsevierStyleCrossRef" href="#bib0395"><span class="elsevierStyleSup">39</span></a>&#46; Because of this reason&#44; the aim of this study was to isolate pathogens from enteric disease in rabbits from Mexico&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Material and methods</span><p id="par0010" class="elsevierStylePara elsevierViewall">Fifty-eight rabbits with an enteric clinical profile were obtained from several rabbit meat production from the southeastern part of the State of Mexico&#44; Mexico&#46; The animals exhibited an enteric clinical profile that included depression&#44; anorexia&#44; dehydration&#44; abdominal distension&#44; liquid-to-mucoid diarrhea and death within 24<span class="elsevierStyleHsp" style=""></span>h&#46; Isolates were recovered from the intestinal contents through the necropsy service of the Amphitheater of Veterinary Medicine and Zootechnics of the Centro Universitario Amecameca &#40;CU Amecameca&#41;&#44; of the Universidad Aut&#243;noma del Estado de M&#233;xico &#40;UAEMex&#41;&#46; This study was authorized by the Bioethics Committee of the CU Amecameca &#40;CBE&#47;06&#47;2013&#41;&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Eimeria</span> spp&#46; were identified by microscopy and the parasitological flotation technique<a class="elsevierStyleCrossRef" href="#bib0345"><span class="elsevierStyleSup">29</span></a>&#46; DNA was extracted from the stool samples using the ZR Fecal DNA MiniPrep&#8482; &#40;ZYMO Research&#44; USA&#41;&#44; according to the manufacturer&#39;s instructions&#46; DNA samples were assessed quantitatively and qualitatively by measurements of absorbance in a Nano Drop 2000c &#40;Thermo Scientific&#44; USA&#41;&#46; A PCR was also performed&#44; using primers for the amplification of the ribosomal cistron&#44; ITS1 region &#40;400&#8211;500<span class="elsevierStyleHsp" style=""></span>bp long&#41; of Eimeria tenella&#44; as reported by Oliveira et al&#46;<a class="elsevierStyleCrossRef" href="#bib0295"><span class="elsevierStyleSup">19</span></a> &#40;accession number AFO26388&#41;&#46; The following reagents were added to 1<span class="elsevierStyleHsp" style=""></span>mg of DNA to make 25<span class="elsevierStyleHsp" style=""></span>&#956;l PCR solution&#58; 2&#46;5<span class="elsevierStyleHsp" style=""></span>mM MgCl<span class="elsevierStyleInf">2</span>&#44; 100<span class="elsevierStyleHsp" style=""></span>mM each dATP&#44; dCTP&#44; dGTP&#44; dTTP&#44; 1&#46;5<span class="elsevierStyleHsp" style=""></span>U GoTaq Flexi DNA Polymerase &#40;PROMEGA&#44; USA&#41;&#44; 5<span class="elsevierStyleHsp" style=""></span>&#956;l 5&#215; Green GoTaq Flexi Buffer&#44; and 0&#46;8<span class="elsevierStyleHsp" style=""></span>mM of each primer&#46; The amplification conditions included 35 cycles of denaturation at 96<span class="elsevierStyleHsp" style=""></span>&#176;C for 45<span class="elsevierStyleHsp" style=""></span>s&#44; annealing at 54<span class="elsevierStyleHsp" style=""></span>&#176;C for 45<span class="elsevierStyleHsp" style=""></span>s and extension at 72<span class="elsevierStyleHsp" style=""></span>&#176;C for 60<span class="elsevierStyleHsp" style=""></span>s&#46; A sequenced sample was included as positive control and DNA obtained from rabbit blood was used as negative control&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">The bacteriological analyses involved primary isolation in blood agar&#59; identification was performed by colonial morphology and Gram staining&#46; Gram negative bacteria were cultured in the following selective media&#58; MacConkey&#44; Salmonella-Shigella and brilliant green agar at 37<span class="elsevierStyleHsp" style=""></span>&#176;C incubation temperature and aerobiosis for 24&#8211;48<span class="elsevierStyleHsp" style=""></span>h<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">2</span></a>&#46; To identify <span class="elsevierStyleItalic">Salmonella</span>&#44; the samples were previously inoculated in peptone water and tetrathionate broth&#46; A colony of each growth produced was selected as a representative isolate and subcultured for further biochemical identification&#46; Biochemical tests of oxidase&#44; catalase&#44; triple sugar iron&#44; ornithine decarboxylase&#44; sulfide indol motility and urease were performed<a class="elsevierStyleCrossRefs" href="#bib0225"><span class="elsevierStyleSup">5&#44;10&#44;14</span></a>&#46; Gram positive bacteria were analyzed for evidence of catalase&#44; coagulase&#44; hemolysis&#44; and cultured in mannitol salt agar<a class="elsevierStyleCrossRef" href="#bib0400"><span class="elsevierStyleSup">40</span></a>&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">To determine the <span class="elsevierStyleItalic">E&#46; coli</span> pathotypes&#44; we used a pathogen-specific multiplex PCR to detect enterotoxigenic <span class="elsevierStyleItalic">E&#46; coli</span> &#40;ETEC&#41;&#44; enteropathogenic <span class="elsevierStyleItalic">E&#46; coli</span> &#40;EPEC&#41;&#44; enteroinvasive <span class="elsevierStyleItalic">E&#46; coli</span> &#40;EIEC&#41; and Shiga-toxin-producing or enterohemorrhagic <span class="elsevierStyleItalic">E&#46; coli</span> &#40;EHEC o STEC o VTEC&#41;&#44; using specific primers&#44; by the amplification of 150&#8211;650<span class="elsevierStyleHsp" style=""></span>bp fragments for diverse virulence traits as reported by L&#243;pez-Saucedo et al&#46;<a class="elsevierStyleCrossRef" href="#bib0275"><span class="elsevierStyleSup">15</span></a> Representative positive PCR products were purified and sequenced using an ABI PRISM 3500 genetic analyzer &#40;Life Technologies&#44; Carlsbad&#44; CA&#41;&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Rotavirus detection was accomplished by the amplification of a 380<span class="elsevierStyleHsp" style=""></span>bp fragment of capsid protein VP6&#44; employing primers as reported by Iturriza-Gomora et al&#46;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">12</span></a> RNA extraction was performed using GeneJET Viral DNA and the RNA Purification Kit &#40;Thermo Scientific&#44; USA&#41;&#46; The two-step RT-PCR technique was implemented&#59; complementary DNA &#40;cDNA&#41; was obtained by means of the SuperScript III Reverse Transcriptase &#40;RT&#41; &#40;Thermo Scientific&#44; USA&#41;&#46; PCR conditions were as follows&#58; Initial denaturation at 96<span class="elsevierStyleHsp" style=""></span>&#176;C for 10<span class="elsevierStyleHsp" style=""></span>min&#44; follow by 45 cycles of denaturation at 96<span class="elsevierStyleHsp" style=""></span>&#176;C for 45<span class="elsevierStyleHsp" style=""></span>s&#44; annealing at 61<span class="elsevierStyleHsp" style=""></span>&#176;C for 45<span class="elsevierStyleHsp" style=""></span>s and an extension at 72<span class="elsevierStyleHsp" style=""></span>&#176;C for 30<span class="elsevierStyleHsp" style=""></span>s&#44; the final extension at 72<span class="elsevierStyleHsp" style=""></span>&#176;C for 5 min&#46; As a positive control&#44; we used the Rota teq pentavalent vaccine &#40;MSD SNC&#44; Lyon&#44; France&#41;&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">In order to test the association between the presence of the identified agents and the clinical profiles&#44; we used the Fisher&#39;s exact test&#44; with a significance threshold of &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;05&#41;&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Results</span><p id="par0040" class="elsevierStylePara elsevierViewall">Out of 58 intestine content samples&#44; 35&#47;58 &#40;60&#46;4&#37;&#41; were positive for at least one identification and 23 &#40;39&#46;6&#37;&#41; were in concurrence&#44; including&#58; 3&#47;58 &#40;5&#46;2&#37;&#41; with two identifications and 14&#47;58 &#40;24&#46;0&#37;&#41; with three identifications&#46; Rotavirus was identified for the first time in rabbits from Mexico in 6&#47;58 samples &#40;10&#46;3&#37;&#41;&#44; of which 5&#47;6 samples &#40;83&#46;3&#37;&#41; showed the identification of concomitant infection by Rotavirus and other pathogens&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">We identified six highly pathogenic <span class="elsevierStyleItalic">Eimeria</span> species in 45&#47;58 rabbits &#40;77&#46;5&#37;&#41;&#59; mildly pathogenic <span class="elsevierStyleItalic">E&#46; intestinalis</span> in 2&#47;58 rabbits &#40;4&#46;4&#37;&#41; and <span class="elsevierStyleItalic">E&#46; flavescens</span> in 2&#47;58 &#40;4&#46;4&#37;&#41;&#59; lowly pathogenic <span class="elsevierStyleItalic">E&#46; magna</span> in 35&#47;58 &#40;77&#46;7&#37;&#41;&#44; <span class="elsevierStyleItalic">E&#46; media</span> in 8&#47;58 &#40;17&#46;7&#37;&#41;&#59; <span class="elsevierStyleItalic">E&#46; perforans</span> in 12&#47;58 &#40;26&#46;6&#37;&#41; and <span class="elsevierStyleItalic">E&#46; vejdovsky</span> in 4&#47;58 &#40;8&#46;8&#37;&#41;&#44; followed by <span class="elsevierStyleItalic">Aeromona</span> spp&#46; &#40;15&#46;5&#37;&#41; and <span class="elsevierStyleItalic">E&#46; coli</span> in 5&#47;58 &#40;8&#46;6&#37;&#41;&#44; corresponding to enteropathogenic <span class="elsevierStyleItalic">E&#46; coli</span> &#40;EPEC&#41; while the other strains were non-diarrheagenic by PCR&#44; using primers for <span class="elsevierStyleItalic">bfp</span>A detection<a class="elsevierStyleCrossRef" href="#bib0275"><span class="elsevierStyleSup">15</span></a>&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">There were 86 identifications in the 58 samples&#46; <a class="elsevierStyleCrossRef" href="#fig0005">Figure 1</a> shows the frequency of detection per agent&#46; The concurring presence of pathogenic agents identified in the intestine content samples is shown in <a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#46; Results of the Fisher&#39;s exact test showed a statistically significant association of the clinical profiles and the presence of <span class="elsevierStyleItalic">Eimeria</span> spp&#46; &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;000&#41;&#44; <span class="elsevierStyleItalic">E&#46; coli</span> EPEC &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;09&#41;&#44; <span class="elsevierStyleItalic">Mannheimia</span> spp&#46; &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;001&#41;&#44; <span class="elsevierStyleItalic">Salmonella</span> spp&#46;&#44; <span class="elsevierStyleItalic">Klebsiella</span> spp&#46;&#44; <span class="elsevierStyleItalic">S&#46; aureus</span> and <span class="elsevierStyleItalic">Enterococcus</span> spp&#46; &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;006&#41; &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#46; In relation to the clinical profile observed&#44; diarrhea &#40;with varying characteristics&#41; was the most frequent sign&#44; followed by abdominal distension&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><elsevierMultimedia ident="tbl0010"></elsevierMultimedia></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Discussion</span><p id="par0055" class="elsevierStylePara elsevierViewall">In contrast with the results obtained by Szalo et al&#46;<a class="elsevierStyleCrossRef" href="#bib0370"><span class="elsevierStyleSup">34</span></a>&#44; who suggested that the enteropathy in rabbits is a bacterial disease and does not have a viral or parasitic etiology and with Martella et al&#46;<a class="elsevierStyleCrossRef" href="#bib0280"><span class="elsevierStyleSup">16</span></a>&#44; where rotavirus was the most frequent agent isolated from enteric profiles in rabbits&#44; in the present study&#44; <span class="elsevierStyleItalic">Eimeria</span> spp&#46; was the most frequently recovered agent&#44; both on its own and in association with other pathogens&#46; Studies in other countries have reported the presence of eleven <span class="elsevierStyleItalic">Eimeria</span> species that affect rabbits in up to 70&#37; of enteropathies&#44; and&#44; according to their level of pathogenicity&#44; can cause reduced growth rate and feed conversion&#44; and increased mortality<a class="elsevierStyleCrossRefs" href="#bib0295"><span class="elsevierStyleSup">19&#44;21</span></a>&#46; In this work we only identified by PCR six of the eleven <span class="elsevierStyleItalic">Eimeria</span> species in the samples&#44; being <span class="elsevierStyleItalic">E&#46; magna</span> and <span class="elsevierStyleItalic">E&#46; perforans</span> the most frequently found&#44; considered as mildly and lowly pathogenic respectively&#59; however&#44; although all the rabbits presented enteric disease&#44; the association with other pathogens had not been reported&#46; Interestingly in the present study&#44; we found an association of <span class="elsevierStyleItalic">Eimeria</span> spp&#46; with gram negative bacteria and less frequently with Gram positive bacteria&#46; These results provide epidemiological evidence of synergism among <span class="elsevierStyleItalic">Eimeria</span> spp&#46; and <span class="elsevierStyleItalic">E&#46; coli</span> and other enteric pathogens&#46; It seems that by being simultaneously present in the enteric profiles&#44; these pathogens can increase their pathogenic potential<a class="elsevierStyleCrossRef" href="#bib0215"><span class="elsevierStyleSup">3</span></a>&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">The replication of <span class="elsevierStyleItalic">Eimeria</span> spp&#46; within the epithelial cells of the intestine&#44; alters the natural resistance barrier<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">30</span></a>&#44; which is intensified due to various factors such as the production of inflammatory cytokines&#44; mainly interleukin 6 &#40;IL-6&#41; and to a lesser degree interleukin 8 &#40;IL-8&#41; released as a result of massive cell lysis&#46; These mechanisms are used by gram negative bacteria such as <span class="elsevierStyleItalic">E&#46; coli</span> and <span class="elsevierStyleItalic">Salmonella</span> spp&#46; to increase intestinal wall disorganization&#44; consequently invading the tissue<a class="elsevierStyleCrossRefs" href="#bib0230"><span class="elsevierStyleSup">6&#44;22</span></a>&#44; facilitating bacterial adherence and penetration<a class="elsevierStyleCrossRef" href="#bib0335"><span class="elsevierStyleSup">27</span></a>&#46; Further&#44; some <span class="elsevierStyleItalic">Eimeria</span> species enhance host mucogenesis since the mucus layer of the gastrointestinal tract is an excellent source of nutrients for some bacteria<a class="elsevierStyleCrossRef" href="#bib0300"><span class="elsevierStyleSup">20</span></a>&#46; Blankets and globular particles of mucus associated with numerous bacteria on villi and extensive inflammatory lesions have been observed in rabbits with an enteric profile and bacteria were observed attached to the site of serious cell damage<a class="elsevierStyleCrossRef" href="#bib0230"><span class="elsevierStyleSup">6</span></a>&#46; They can take advantage of this scenario for synergies and exercise their mechanisms of pathogenicity or may be considered as secondary invaders&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Aeromonas</span> spp&#46; are members of the microbiota of warm-blooded animals and have been reported to cause septicemia and gastroenteritis &#40;with self-limiting acute diarrhea&#41;<a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">1</span></a>&#46; Their mechanism of pathogenicity is through type III secretion systems&#44; with production of cytotoxic&#44; hemolytic&#44; enterotoxic and lethal enterotoxin&#44; which also alters the cytoskeletal signaling cascades and promotes bacterial growth<a class="elsevierStyleCrossRefs" href="#bib0325"><span class="elsevierStyleSup">25&#44;28</span></a>&#46; The pathogenic role of this bacterium in enteric disease has been demonstrated and studied in the present study&#44; <span class="elsevierStyleItalic">Aeromonas</span> spp&#46; occurred with a frequency of 10&#46;47&#37;&#46; The isolation of <span class="elsevierStyleItalic">Aeromonas</span> spp&#46;&#44; on their own or in association with other pathogens from the intestinal contents suggests their involvement in the enteric profiles&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">In our study&#44; enteropathogenic <span class="elsevierStyleItalic">E&#46; coli</span> &#40;EPEC&#41; was found in five animals &#40;8&#46;6&#37;&#41;&#44; which is very similar to Swennes et al&#46;&#8217;s findings<a class="elsevierStyleCrossRefs" href="#bib0360"><span class="elsevierStyleSup">32&#44;33</span></a>&#44; who described 10&#46;5 and 4&#46;3&#37; EPEC in laboratory rabbits&#46; Lavazza et al&#46;<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">14</span></a> found that <span class="elsevierStyleItalic">E&#46; coli</span> was the only pathogen in about 40&#46;0&#37; of cases of domestic rabbits&#46; Dewr&#233;e et al&#46;<a class="elsevierStyleCrossRef" href="#bib0230"><span class="elsevierStyleSup">6</span></a> found that the most commonly isolated digestive tract bacteria pathogens were <span class="elsevierStyleItalic">E&#46; coli</span>&#44; but they did not find EPEC&#46; This bacterium is a member of the intestinal microbiota and possibly several factors generate a state of immunosuppression&#44; which allows significant replication of some opportunistic agents or performing synergy with other competing agents<a class="elsevierStyleCrossRefs" href="#bib0250"><span class="elsevierStyleSup">10&#44;14&#44;23&#44;36</span></a>&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">We found that 60&#46;4&#37; of intestinal content samples were positive for one identification&#44; 5&#46;2&#37; for two and 24&#37; for three&#46; Other studies in human detected enteropathogens in 66&#46;4&#37; of patients with diarrhea&#44; a single enteric pathogen in 50&#46;9&#37; and multiple pathogens in 15&#46;5&#37;&#59; concomitant infection by more than one enteric pathogen occurred in 18&#46;6&#37; of the infants and 29&#37; contained multiple pathogens<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">8</span></a>&#46;</p><p id="par0080" class="elsevierStylePara elsevierViewall">The enteric syndrome has a large impact on rabbit production&#46; Several authors suggest that rotavirus could be the main cause of enteric disease in rabbits and also be implicated as the etiological agent of severe enteric outbreaks<a class="elsevierStyleCrossRefs" href="#bib0280"><span class="elsevierStyleSup">16&#44;35</span></a>&#46; Lavazza et al&#46;<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">14</span></a> identified rotavirus in rabbits by electron microscopy &#40;16&#46;0&#37;&#41;&#44; detecting 3&#46;3&#37; to 36&#46;6&#37; in humans<a class="elsevierStyleCrossRefs" href="#bib0240"><span class="elsevierStyleSup">8&#44;27&#44;37</span></a>&#44; our findings show the presence of rotavirus in fewer cases &#40;10&#46;3&#37;&#41;&#46; The concomitant identification of rotavirus and other pathogens was detected in 5&#47;6 &#40;83&#46;3&#37;&#41; samples&#46; <span class="elsevierStyleItalic">In vitro</span> models of pathogenesis indicate that synergism between rotavirus and invasive bacteria involve specific biologic pathways&#58; the attachment of&#44; or the invasion through an up-regulation of specific receptors<a class="elsevierStyleCrossRef" href="#bib0355"><span class="elsevierStyleSup">31</span></a>&#46; Bhavnani et al&#46;<a class="elsevierStyleCrossRef" href="#bib0215"><span class="elsevierStyleSup">3</span></a> found epidemiologic evidence of synergism between rotavirus and other enteric pathogens for producing enteric clinical profiles&#44; either by enhancing attachment and bacterial invasion of intestinal epithelial cells or by producing inflammation promoting the development of bacteria by the release of fluid&#44; mucin&#44; cellular detritus and the secretion of antimicrobials&#44; which could alter the composition of the gut microbiota&#44; allowing pathogens to occupy their commensal niche&#46; Lavazza et al&#46;<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">14</span></a>&#44; conclude that there was no association between viral positivity or negativity and the presence of bacteria&#46; Our results agree with those of Dewr&#233;e et al&#46;<a class="elsevierStyleCrossRef" href="#bib0230"><span class="elsevierStyleSup">6</span></a> and Rodriguez De Lara et al&#46;<a class="elsevierStyleCrossRef" href="#bib0315"><span class="elsevierStyleSup">23</span></a>&#44; about rotaviruses as the main cause of the epizootic outbreaks of diarrheas is questionable&#44; particularly if considering that rotavirus are considered endemic and mildly pathogenic in commercial rabbitries&#46; However&#44; this is the first molecular report confirming the presence of rotavirus in the enteric profiles of rabbits from Mexico&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">In the bacteriological results in rabbits&#44; Lavazza et al&#46;<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">14</span></a> included <span class="elsevierStyleItalic">E&#46; coli</span>&#44; <span class="elsevierStyleItalic">S&#46; aureus</span>&#44; <span class="elsevierStyleItalic">Klebsiella</span> spp&#46;&#44; <span class="elsevierStyleItalic">Yersinia</span> spp&#46;&#44; Pasteurella <span class="elsevierStyleItalic">multocida&#44; C&#46; perfringens</span> and <span class="elsevierStyleItalic">C&#46; spiriforme</span>&#46; This study found <span class="elsevierStyleItalic">E&#46; coli&#44; Aeromonas</span> spp&#46;&#44; <span class="elsevierStyleItalic">Salmonella</span> spp&#46;&#44; <span class="elsevierStyleItalic">Enterococcus</span> spp&#46;&#44; <span class="elsevierStyleItalic">Streptococcus</span> spp&#46;&#44; <span class="elsevierStyleItalic">S&#46; aureus</span>&#44; <span class="elsevierStyleItalic">Mannheimia</span> spp&#46;&#44; and <span class="elsevierStyleItalic">Klebsiella</span> spp&#46; In humans&#44; the results of several research works were similar&#58; in Jordan&#44; enteropathogenic <span class="elsevierStyleItalic">E&#46; coli</span> &#40;12&#46;8&#37;&#41;&#44; enteroaggregative <span class="elsevierStyleItalic">E&#46; coli</span> &#40;10&#46;2&#37;&#41;&#44; enterotoxigenic <span class="elsevierStyleItalic">E&#46; coli</span> &#40;5&#46;7&#37;&#41;&#44; <span class="elsevierStyleItalic">Shigella</span> spp&#46; &#40;4&#46;9&#37;&#41;&#44; <span class="elsevierStyleItalic">Entamoeba histolytica</span> &#40;4&#46;9&#37;&#41;&#44; <span class="elsevierStyleItalic">Salmonella</span> spp&#46; &#40;4&#46;5&#37;&#41;&#44; <span class="elsevierStyleItalic">Campylobacter jejuni&#47;coli</span> &#40;1&#46;5&#37;&#41;&#44; <span class="elsevierStyleItalic">Cryptosporidium</span> spp&#46; &#40;1&#46;5&#37;&#41;&#44; enteroinvasive <span class="elsevierStyleItalic">E&#46; coli</span> &#40;1&#46;5&#37;&#41;&#44; <span class="elsevierStyleItalic">Giardia lamblia</span> &#40;0&#46;8&#37;&#41; and <span class="elsevierStyleItalic">Yersinia enterocolitica</span> &#40;0&#46;4&#37;&#41;<a class="elsevierStyleCrossRef" href="#bib0395"><span class="elsevierStyleSup">39</span></a>&#59; in Colombia&#44; enteropathogenic <span class="elsevierStyleItalic">E&#46; coli</span> &#40;6&#46;0&#37;&#41;&#44; enterohemorragic <span class="elsevierStyleItalic">E&#46; coli</span> &#40;2&#46;8&#37;&#41;&#44; <span class="elsevierStyleItalic">Aeromonas hydrophila</span> &#40;2&#46;0&#37;&#41; and other pathogens &#40;52&#46;6&#37;&#41;<a class="elsevierStyleCrossRef" href="#bib0380"><span class="elsevierStyleSup">36</span></a> were identified&#59; in the Netherlands&#44; enteropathogenic <span class="elsevierStyleItalic">E&#46; coli</span> were detected in 19&#46;9&#37;&#44; and <span class="elsevierStyleItalic">Salmonella enterica</span> in 0&#46;3&#37;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">8</span></a>&#59; in Papua New Guinea&#44; <span class="elsevierStyleItalic">Shigella</span> spp&#46; &#40;26&#46;6&#37;&#41;&#44; enteropathogenic <span class="elsevierStyleItalic">E&#46; coli</span> &#40;8&#46;5&#37;&#41;&#44; <span class="elsevierStyleItalic">Salmonella</span> spp&#46; were found below the limit of detection<a class="elsevierStyleCrossRef" href="#bib0335"><span class="elsevierStyleSup">27</span></a>&#46;</p><p id="par0090" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Staphylococcus</span> spp&#46; make up the microbiota of the upper respiratory tract and lower urogenital tract&#44; are transitory in the digestive tract and predominant in the small intestine and cecum&#59; it has been observed that <span class="elsevierStyleItalic">S&#46; aureus</span> produces yellow diarrhea in nursing rabbits<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">12</span></a>&#46; Lavazza et al&#46;<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">14</span></a> found <span class="elsevierStyleItalic">Staphylococcus</span> both in isolation and associated with <span class="elsevierStyleItalic">E&#46; coli</span> and <span class="elsevierStyleItalic">P&#46; multocida</span>&#59; with and without viral presence&#46; Furthermore&#44; they found <span class="elsevierStyleItalic">Streptococcus</span> as single isolates from rabbits with enteritis&#46; Our results show the presence of <span class="elsevierStyleItalic">S&#46; aureus</span> in association with <span class="elsevierStyleItalic">Eimeria</span> spp&#46; in 5&#46;2&#37;&#46; <span class="elsevierStyleItalic">Streptococcus</span> spp&#46;&#44; were found both on their own &#40;1&#46;7&#37;&#41; and in a concurrent manner with protozoa parasite <span class="elsevierStyleItalic">Eimeria</span> spp&#46; &#40;1&#46;7&#37;&#41;&#46; Isolation frequency was not as high as in the case of other pathogen&#44; however&#44; their presence indicates involvement in promoting enteric profiles in rabbits&#46;</p><p id="par0095" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Enterococcus</span> spp&#46; are ubiquitous and are consistently found in animal gastrointestinal tracts&#46; In pigs&#44; the co-occurrence of <span class="elsevierStyleItalic">Enterococcus</span> genus and <span class="elsevierStyleItalic">E&#46; coli</span> has been previously reported and this interaction has been found to contribute to the development of new neonatal porcine diarrhea<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">11</span></a>&#46; Specifically&#44; <span class="elsevierStyleItalic">Enterococcus hirae</span> has been associated with enteropathy in cats and with diarrhea in rats and nursing kittens<a class="elsevierStyleCrossRefs" href="#bib0235"><span class="elsevierStyleSup">7&#44;9&#44;13</span></a>&#46; It has also been isolated from an outbreak of diarrhea in nursing rabbits with 85&#37; morbidity and 50&#37; mortality&#59; rabbits died within a 3 day period<a class="elsevierStyleCrossRef" href="#bib0390"><span class="elsevierStyleSup">38</span></a>&#46; In the present study&#44; we found <span class="elsevierStyleItalic">Enterococcus</span> spp&#46;&#44; without any associated pathogenic agent in two samples of intestinal content &#40;3&#46;5&#37;&#41; related to diarrhea episodes&#44; which suggests they could be etiologic agents&#46;</p><p id="par0100" class="elsevierStylePara elsevierViewall">Dewr&#233;e et al&#46;<a class="elsevierStyleCrossRef" href="#bib0230"><span class="elsevierStyleSup">6</span></a> studied the epizootic rabbit enteropathy and found several bacteria adhering to the epithelial surface and inside the enterocytes in a few animals&#59; none of the bacteria isolated from the intestinal mixed contents and cultivated on usual media were known as rabbit pathogens&#46; There are several specific cases suggesting that pathogens can have significant impact upon each other&#44; sometimes directly but at other times through the changes they cause to particular body systems and processes&#44; including layers and components of the immune system<a class="elsevierStyleCrossRefs" href="#bib0330"><span class="elsevierStyleSup">26&#44;30</span></a>&#46; The presence of several pathogens in more than half of the intestinal content samples of the rabbits with enteric clinical profiles required to determine if these pathogens found concomitantly can act synergistically&#44; and interestingly&#44; if these clinical enteric profiles are different when they are produced by a single pathogen and if the presence of two or more pathogens&#44; increasing pathogenicity&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Ethical disclosures</span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Protection of human and animal subjects</span><p id="par0105" class="elsevierStylePara elsevierViewall">The authors declare that the procedures followed were in accordance with the regulations of the relevant clinical research ethics committee and with those of the Code of Ethics of the World Medical Association &#40;Declaration of Helsinki&#41;&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Confidentiality of data</span><p id="par0110" class="elsevierStylePara elsevierViewall">The authors declare that no patient data appear in this article&#46;</p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Right to privacy and informed consent</span><p id="par0115" class="elsevierStylePara elsevierViewall">The authors declare that no patient data appear in this article&#46;</p></span></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Conflict of interest</span><p id="par0120" class="elsevierStylePara elsevierViewall">The authors declare no conflict of interest in the present study&#46;</p></span></span>"
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        8 => array:3 [
          "identificador" => "sec0025"
          "titulo" => "Ethical disclosures"
          "secciones" => array:3 [
            0 => array:2 [
              "identificador" => "sec0030"
              "titulo" => "Protection of human and animal subjects"
            ]
            1 => array:2 [
              "identificador" => "sec0035"
              "titulo" => "Confidentiality of data"
            ]
            2 => array:2 [
              "identificador" => "sec0040"
              "titulo" => "Right to privacy and informed consent"
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          ]
        ]
        9 => array:2 [
          "identificador" => "sec0045"
          "titulo" => "Conflict of interest"
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        10 => array:2 [
          "identificador" => "xack284613"
          "titulo" => "Acknowledgements"
        ]
        11 => array:1 [
          "titulo" => "References"
        ]
      ]
    ]
    "pdfFichero" => "main.pdf"
    "tienePdf" => true
    "fechaRecibido" => "2015-08-25"
    "fechaAceptado" => "2016-10-11"
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        0 => array:4 [
          "clase" => "keyword"
          "titulo" => "Keywords"
          "identificador" => "xpalclavsec843741"
          "palabras" => array:4 [
            0 => "Enteropathies"
            1 => "Pathogens"
            2 => "Rabbits"
            3 => "Mexico"
          ]
        ]
      ]
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          "clase" => "keyword"
          "titulo" => "Palabras clave"
          "identificador" => "xpalclavsec843740"
          "palabras" => array:4 [
            0 => "Enteropat&#237;as"
            1 => "Agentes pat&#243;genos"
            2 => "Conejos"
            3 => "M&#233;xico"
          ]
        ]
      ]
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        "titulo" => "Abstract"
        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Enteropathies in rabbits are difficult to diagnose&#59; their etiology involves pathogens that act synergistically&#44; causing damage to the intestine&#46; The aim of the present study was isolate enteric pathogens from rabbits in Mexico&#46; Using parasitological&#44; bacteriological and molecular analyses&#44; we screened 58 samples of the intestinal content of rabbits having a clinical history of enteric disease from the southeastern part of the State of Mexico&#46; Out of the 58 samples analyzed&#44; a total of 86 identifications were made&#44; <span class="elsevierStyleItalic">Eimeria</span> spp&#46; were found in 77&#46;5&#37;&#44; followed by <span class="elsevierStyleItalic">Aeromonas</span> spp&#46; in 15&#46;5&#37; and <span class="elsevierStyleItalic">Escherichia coli</span> in 8&#46;6&#37;&#44; which were identified as enteropathogenic <span class="elsevierStyleItalic">E&#46; coli</span> &#40;EPEC&#41;&#44; and the presence of the following agents was also confirmed&#58; <span class="elsevierStyleItalic">Salmonella</span> spp&#46;&#44; <span class="elsevierStyleItalic">Klebsiella</span> spp&#46;&#44; <span class="elsevierStyleItalic">Streptococcus</span> spp&#46;&#44; <span class="elsevierStyleItalic">Staphylococcus aureus</span>&#44; <span class="elsevierStyleItalic">Enterococcus</span> spp&#46;&#44; <span class="elsevierStyleItalic">Mannheimia</span> spp&#46; and <span class="elsevierStyleItalic">Rotavirus</span>&#46; The concurrent presence of <span class="elsevierStyleItalic">Eimeria</span> spp&#46; with <span class="elsevierStyleItalic">Aeromonas</span> was frequent &#40;15&#46;5&#37;&#41;&#59; there was statistical significance for the presence of an association between the clinical profiles and <span class="elsevierStyleItalic">Eimeria</span> spp&#46; &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;000&#41;&#44; <span class="elsevierStyleItalic">Mannheimia</span> spp&#46; &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;001&#41;&#44; <span class="elsevierStyleItalic">Salmonella</span> spp&#46;&#44; <span class="elsevierStyleItalic">Klebsiella</span> spp&#46;&#44; <span class="elsevierStyleItalic">Streptococcus</span> spp&#46; and <span class="elsevierStyleItalic">Enterococcus</span> spp&#46; &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;006&#41;&#46;</p></span>"
      ]
      "es" => array:2 [
        "titulo" => "Resumen"
        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Las enteropat&#237;as en conejos son dif&#237;ciles de diagnosticar&#44; debido a que en su etiolog&#237;a participan pat&#243;genos que act&#250;an en sinergia y causan da&#241;o al intestino&#46; El objetivo de este estudio fue el aislamiento de pat&#243;genos de cuadros ent&#233;ricos en conejos de M&#233;xico&#46; Mediante m&#233;todos parasitol&#243;gicos&#44; bacteriol&#243;gicos y moleculares&#44; se analizaron 58 muestras de contenido intestinal de conejos con el antecedente de cuadro cl&#237;nico ent&#233;rico procedentes de granjas cun&#237;colas de la zona suroriente del Estado de M&#233;xico&#46; A partir de las 58 muestras se realizaron un total de 86 identificaciones&#44; los pat&#243;genos m&#225;s frecuentes fueron <span class="elsevierStyleItalic">Eimeria</span> spp&#46; &#40;77&#44;6&#37;&#41;&#44; seguidas de <span class="elsevierStyleItalic">Aeromonas</span> spp&#46; &#40;15&#44;5&#37;&#41; y de <span class="elsevierStyleItalic">Escherichia coli</span> &#40;8&#44;6&#37;&#41;&#44; identificadas como <span class="elsevierStyleItalic">E&#46; coli</span> enterpatog&#233;nicas &#40;EPEC&#41;&#46; Tambi&#233;n se determin&#243; la presencia de otros agentes&#58; <span class="elsevierStyleItalic">Salmonella</span> spp&#46;&#44; <span class="elsevierStyleItalic">Klebsiella</span> spp&#46;&#44; <span class="elsevierStyleItalic">Streptococcus</span> spp&#46;&#44; <span class="elsevierStyleItalic">Staphylococcus aureus&#44; Enterococcus</span> spp&#46;&#44; <span class="elsevierStyleItalic">Mannheimia</span> spp&#46; y <span class="elsevierStyleItalic">Rotavirus</span>&#46; La presencia concurrente de <span class="elsevierStyleItalic">Eimeria</span> spp&#46; y <span class="elsevierStyleItalic">Aeromonas</span> spp&#46; &#40;15&#44;5&#37;&#41; fue la observaci&#243;n m&#225;s frecuente&#46; Se encontr&#243; asociaci&#243;n estad&#237;sticamente significativa entre la presentaci&#243;n del cuadro cl&#237;nico en conejos y la presencia de <span class="elsevierStyleItalic">Eimeria</span> spp&#46; &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;000&#41;&#44; <span class="elsevierStyleItalic">Mannheimia</span> spp&#46; &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;001&#41;&#44; <span class="elsevierStyleItalic">Salmonella</span> spp&#46;&#44; <span class="elsevierStyleItalic">Klebsiella</span> spp&#46;&#44; <span class="elsevierStyleItalic">Streptococcus</span> spp&#46; y <span class="elsevierStyleItalic">Enterococcus</span> spp&#46; &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;006&#41;&#46;</p></span>"
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        "descripcion" => array:1 [
          "en" => "<p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Agents isolated from enteric profiles in rabbits from Mexico&#46;</p>"
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                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Concurrent identification&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="center" valign="top" scope="col" style="border-bottom: 2px solid black">Frequency&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="center" valign="top" scope="col" style="border-bottom: 2px solid black">Percentage&nbsp;\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">Enteropathogenic <span class="elsevierStyleItalic">Escherichia coli</span> &#40;EPEC&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">8&#46;7&nbsp;\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"><span class="elsevierStyleItalic">Eimeria magna</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">25&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">43&#46;1&nbsp;\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"><span class="elsevierStyleItalic">Enterococcus</span> spp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">3&#46;5&nbsp;\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"><span class="elsevierStyleItalic">Streptococcus</span> spp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&#46;7&nbsp;\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"><span class="elsevierStyleItalic">Rotavirus</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&#46;7&nbsp;\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"><span class="elsevierStyleItalic">Mannheimia</span> spp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&#46;7&nbsp;\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"><span class="elsevierStyleItalic">Eimeria magna</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">E&#46; perforans</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Aeromona</span> spp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">9&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">15&#46;5&nbsp;\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"><span class="elsevierStyleItalic">Eimeria media</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Sthapylococcus aureus</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&#46;7&nbsp;\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"><span class="elsevierStyleItalic">Eimeria media</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">E&#46; intestinalis</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">E&#46; perforans</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Staphylococcus aureus</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">3&#46;5&nbsp;\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"><span class="elsevierStyleItalic">Eimeria magna</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">E&#46; perforans</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">E&#46; vejdovsky</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Streptococcus</span> spp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&#46;7&nbsp;\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"><span class="elsevierStyleItalic">Eimeria vejdovsky</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Klebsiella</span> spp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&#46;7&nbsp;\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"><span class="elsevierStyleItalic">Eimeria vejdovsky</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Salmonella</span> spp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&#46;7&nbsp;\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"><span class="elsevierStyleItalic">Eimeria media</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">E&#46; flavescens</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Rotavirus</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">3&#46;4&nbsp;\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"><span class="elsevierStyleItalic">Eimeria media</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">E&#46; vejdovsky</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Rotavirus</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&#46;7&nbsp;\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"><span class="elsevierStyleItalic">Eimeria media</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Klebsiella</span> spp&#46;<span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Rotavirus</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&#46;7&nbsp;\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"><span class="elsevierStyleItalic">Eimeria media</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Salmonella</span> spp&#46;<span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Rotavirus</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">17&#46;0&nbsp;\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">Without isolation&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">5&#46;2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " colspan="3" align="left" valign="top"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="table-entry  " align="" valign="top">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">58&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">100&#46;0&nbsp;\t\t\t\t\t\t\n
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          "en" => "<p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Identification of concurring agents in rabbit intestine samples from Mexico&#46;</p>"
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                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">0&#46;11&nbsp;\t\t\t\t\t\t\n
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