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Molecular analysis of oral and respiratory bacterial species associated with ventilator-associated pneumonia.

Abstract：

:Trauma intensive care unit (TICU) patients requiring mechanical respiratory support frequently develop ventilator-associated pneumonia (VAP). Oral and oropharyngeal bacteria are believed to be responsible for many cases of VAP, but definitive evidence of this relationship is lacking. Earlier studies used conventional culture-based methods for identification of bacterial pathogens, but these methods are insufficient, as some bacteria may be uncultivable or difficult to grow. The purpose of this study was to use a culture-independent molecular approach to analyze and compare the bacterial species colonizing the oral cavity and the lungs of TICU patients who developed VAP. Bacterial samples were acquired from the dorsal tongue and bronchoalveolar lavage fluid of 16 patients. Bacterial DNA was extracted, and the 16S rRNA genes were PCR amplified, cloned into Escherichia coli, and sequenced. The sequencing data revealed the following: (i) a wide diversity of bacterial species in both the oral and pulmonary sites, some of them novel; (ii) known and putative respiratory pathogens colonizing both the oral cavity and lungs of 14 patients; and (iii) a number of bacterial pathogens (e.g., Dialister pneumosintes, Haemophilus segnis, Gemella morbillorum, and Pseudomonas fluorescens) in lung samples that had not been reported previously at this site when culture-based methods were used. Our data indicate that the dorsal surface of the tongue serves as a potential reservoir for bacterial species involved in VAP. Furthermore, it is clear that the diversity of bacterial pathogens for VAP is far more complex than the current literature suggests.

journal_name

J Clin Microbiol

journal_title

Journal of clinical microbiology

authors

Bahrani-Mougeot FK,Paster BJ,Coleman S,Barbuto S,Brennan MT,Noll J,Kennedy T,Fox PC,Lockhart PB

doi

10.1128/JCM.01963-06

subject

Has Abstract

pub_date

2007-05-01 00:00:00

pages

1588-93

issue

5

eissn

0095-1137

issn

1098-660X

pii

JCM.01963-06

journal_volume

45

pub_type

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