Detection of Haemophilus influenzae in respiratory secretions from pneumonia patients by quantitative real-time polymerase chain reaction
2009 (English)In: Diagnostic microbiology and infectious disease, ISSN 0732-8893, E-ISSN 1879-0070, Vol. 64, no 4, 366-373 p.Article in journal (Refereed) Published
A quantitative real-time polymerase chain reaction (PCR) based on the omp P6 gene was developed to detect Haemophilus influenzae. Its specificity was determined by analysis of 29 strains of 11 different Haemophilus spp. and was compared with PCR assays having other target genes: rnpB, 16S rRNA, and bexA. The method was evaluated on nasopharyngeal aspirates from 166 adult patients with community-acquired pneumonia. When 104 DNA copies/mL was used as cutoff limit for the method, P6 PCR had a sensitivity of 97.5% and a specificity of 96.0% compared with the culture. Of 20 culture-negative but P6 PCR-positive cases, 18 were confirmed by fucK PCR as H. influenzae. Five (5.9%) of 84 nasopharyngeal aspirates from adult controls tested PCR positive. We conclude that the P6 real-time PCR is both sensitive and specific for identification of H. influenzae in respiratory secretions. Quantification facilitates discrimination between disease-causing H. influenzae strains and commensal colonization.
Place, publisher, year, edition, pages
Elsevier , 2009. Vol. 64, no 4, 366-373 p.
H. influenzae, Pneumonia, Real-time PCR, Outer membrane protein P6, fucK, rnpB
Microbiology in the medical area
Research subject Microbiology
IdentifiersURN: urn:nbn:se:uu:diva-106189DOI: 10.1016/j.diagmicrobio.2009.03.030ISI: 000269337900002PubMedID: 19446978OAI: oai:DiVA.org:uu-106189DiVA: diva2:224210