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Vol. 26. Issue S9.
Utilidad de la biología molecular en el diagnóstico microbiológico
Pages 26-32 (July 2008)
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Vol. 26. Issue S9.
Utilidad de la biología molecular en el diagnóstico microbiológico
Pages 26-32 (July 2008)
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Biología molecular en el diagnóstico de la infección respiratoria aguda de origen bacteriano
Molecular biology in the diagnosis of acute bacterial infection of the respiratory tract
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José María Marimóna,b,
Corresponding author
josemaria.marimonortizdez@osakidetza.net

Correspondencia: Servicio de Microbiología. Hospital Donostia. P.° Dr. Beguiristain, s/n. 20014 San Sebastián. Guipúzcoa. España.
, Gustavo Cillaa, Emilio Pérez-Tralleroa,b,c
a Servicio de Microbiología. Hospital Donostia. San Sebastián. Guipúzcoa. España
b CIBER Enfermedades Respiratorias (CIBERES). Bunyola. Mallorca. España
c Departamento de Medicina Preventiva y Salud Pública. Facultad de Medicina. Universidad del País Vasco. San Sebastián. Guipúzcoa. España
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Los métodos de diagnóstico bacteriológico empleados tradicionalmente en las infecciones respiratorias agudas (IRA) tienen limitaciones de sensibilidad (cultivo, detección directa de antígenos, etc.), o requieren un tiempo prolongado para obtener resultados (aparición de anticuerpos). En los últimos años, se han desarrollado técnicas de amplificación de ácidos nucleicos (TAAN) que permiten la detección de dianas genéticas específicas de cada patógeno en muestras clínicas. Estas técnicas han mostrado ser más sensibles que el cultivo o la detección directa y, a diferencia de las serológicas, trabajan eficazmente en fase aguda. Sin embargo, tienen limitaciones, como la presencia ocasional de inhibidores de la amplificación en muestras clínicas, la persistencia de Mycoplasma pneumoniae o Chlamydophila pneumoniae en la mucosa de algunas personas, y en la diferenciación entre infección patógena y colonización en el caso de bacterias que forman parte de la flora habitual de la vía respiratoria (Streptococcus pneumoniae, etc.). Las recientemente desarrolladas TAAN en tiempo real han generado expectativas de resolver algunos de estos problemas, al poder cuantificar la carga bacteriana. En el diagnóstico etiológico de la IRA debida a S. pneumoniae, las TAAN siguen estando esencialmente en el campo de la investigación. En el caso de M. pneumoniae y C. pneumoniae, su combinación con la serología mejora la capacidad diagnóstica. Estos métodos son sensibles y específicos para detectar Legionella; sin embargo, su utilidad práctica está por establecer, a la espera de una valoración en relación con la antigenuria. Actualmente, son una alternativa ventajosa para Bordetella pertussis, pero de momento no tienen utilidad en la infección aguda por Coxiella burnetii.

Palabras clave:
Reacción en cadena de la polimerasa
Streptococcus pneumoniae
Mycoplasma pneumoniae
Chlamydophila pneumoniae
Legionella pneumophila
Bordetella pertussis

The bacteriological methods traditionally used in the diagnosis of acute respiratory infections (ARI) have limited sensitivity (culture, direct antigen detection, etc.) or require long periods to obtain results (appearance of antibodies). In the last few years, nucleic acid amplification techniques (NAAT) have been developed that allow pathogen-specific genetic targets to be detected in clinical samples. These techniques have been proven to be more sensitive than culture or direct detection and, unlike serological tests, are effective in the acute phase of the infection. However, NAAT also have certain limitations, such as the occasional presence of amplification inhibitors in clinical samples, the persistence of Mycoplasma pneumoniae or Chlamydophila pneumoniae in the mucosa of some individuals, and the lack of discrimination between pathogen infection and colonization in bacteria forming part of normal respiratory tract flora (Streptococcus pneumoniae…). Recently developed real-time NAAT have raised expectations that some of these obstacles will be resolved, since these techniques allow bacterial load to be quantified. In the etiological diagnosis of ARI due to S. pneumoniae, the use of NAAT is still in an experimental phase. In M. pneumoniae and C. pneumoniae, combining NAAT with serological tests could potentially improve diagnosis. NAAT show good sensitivity and specificity in the detection of Legionella; however, the practical utility of these techniques should be weighed against that of antigenuria. NAAT provide advantages over other techniques in Bordetella pertussis. At present, these techniques are not useful in the diagnosis of Coxiella burnetii acute infections.

Key words:
Polymerase chain reaction
Streptococcus pneumoniae
Mycoplasma pneumoniae
Chlamydophila pneumoniae
Legionella pneumophila
Bordetella pertussis
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Copyright © 2008. Elsevier España S.L.. Todos los derechos reservados
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