Clinical impact of methicillin-resistant staphylococcus aureus on bacterial pneumonia: cultivation and 16S ribosomal RNA gene analysis of bronchoalveolar lavage fluid View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2016-04-16

AUTHORS

Toshinori Kawanami, Kazuhiro Yatera, Kei Yamasaki, Shingo Noguchi, Kazumasa Fukuda, Kentarou Akata, Keisuke Naito, Takashi Kido, Hiroshi Ishimoto, Hatsumi Taniguchi, Hiroshi Mukae

ABSTRACT

BackgroundDetermining whether methicillin-resistant Staphylococcus aureus (MRSA) is a true causative pathogen or reflective of colonization when MRSA is cultured from the respiratory tract remains important in treating patients with pneumonia.MethodsWe evaluated the bacterial microbiota in bronchoalveolar lavage fluid (BALF) using the clone library method with a 16S ribosomal RNA (rRNA) gene analysis in 42 patients from a pneumonia registry who had MRSA cultured from their sputum or BALF samples. Patients were divided into two groups: those treated with (Group A) or without (Group B) anti-MRSA agents, and their clinical features were compared.ResultsAmong 248 patients with pneumonia, 42 patients who had MRSA cultured from the respiratory tract were analyzed (Group A: 13 patients, Group B: 29 patients). No clones of S. aureus were detected in the BALF of 20 out of 42 patients. Twenty-eight of 29 patients in Group B showed favorable clinical outcomes, indicating that these patients had non-MRSA pneumonia. Using a microflora analysis of the BALF, the S. aureus phylotype was predominant in 5 of 28 (17.9 %) patients among the detected bacterial phylotypes, but a minor population (the percentage of clones ≤ 10 %) in 19 (67.9 %) of 28 patients. A statistical analysis revealed no positive relationship between the percentage of clones of the S. aureus phylotype and risk factors of MRSA pneumonia.ConclusionsThe molecular method using BALF specimens suggests that conventional cultivation method results may mislead true causative pathogens, especially in patients with MRSA pneumonia. Further studies are necessary to elucidate these clinically important issues. More... »

PAGES

155

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/s12879-016-1493-3

DOI

http://dx.doi.org/10.1186/s12879-016-1493-3

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https://app.dimensions.ai/details/publication/pub.1018435536

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/27083412


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