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J Infect Dis. 2013 Dec 1;208(11):1813-20. doi: 10.1093/infdis/jit506. Epub 2013 Oct 2.

Distribution of 13-valent pneumococcal conjugate vaccine Streptococcus pneumoniae serotypes in US adults aged ≥50 years with community-acquired pneumonia.

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1
Sinai Grace Hospital Emergency Department and Sinai Grace Hospital/Detroit Receiving Hospital, Wayne State University School of Medicine, Detroit, Michigan.

Abstract

BACKGROUND:

Streptococcus pneumoniae causes a substantial proportion of community-acquired pneumonia (CAP) and healthcare-associated pneumonia (HCAP) in the United States. Limited data are available regarding the pneumococcal serotypes causing CAP and HCAP.

METHODS:

Adults aged ≥ 50 years presenting to participating US hospitals with radiographically confirmed pneumonia between February 2010 and September 2011 were screened for inclusion. S. pneumoniae was identified using microbiological cultures, BinaxNOW® S. pneumoniae assay, or urine antigen detection (UAD) assay capable of detecting 13-valent pneumococcal conjugate vaccine (PCV13)-associated serotypes.

RESULTS:

Among 710 subjects enrolled, the median age was 65.4 years; 54.2% of subjects were male, 22.4% of radiographically confirmed pneumonia cases were considered HCAP, and 96.6% of subjects were hospitalized. S. pneumoniae was detected in 98 subjects (13.8%) by any test, and PCV13-associated serotype(s) were identified by UAD in 78 (11.0%). Serotype 19A was most prevalent, followed by 7F/A, 3, and 5. Serotypes associated with 7-valent pneumococcal conjugate vaccine (PCV7) accounted for 25% of UAD-positive isolates.

CONCLUSIONS:

Pneumococcal serotypes causing noninvasive pneumonia in adults may differ significantly from those causing invasive disease, with PCV7-associated serotypes overrepresented. Serotype 5, rarely seen in contemporary surveillance of invasive disease in the United States, substantially contributed to the observed cases of S. pneumoniae-positive CAP or HCAP.

KEYWORDS:

13-valent pneumococcal conjugate vaccine; Streptococcus pneumoniae; community-acquired pneumonia; healthcare-associated pneumonia; pneumococcal serotypes; serotype distribution; urinary antigen detection assay

PMID:
24092845
DOI:
10.1093/infdis/jit506
[Indexed for MEDLINE]
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