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Published in: BMC Infectious Diseases 1/2010

Open Access 01-12-2010 | Research article

Group B streptococcusserotype prevalence in reproductive-age women at a tertiary care military medical center relative to global serotype distribution

Authors: Danielle L Ippolito, Wesley A James, Deborah Tinnemore, Raywin R Huang, Mary J Dehart, Julie Williams, Mark A Wingerd, Samandra T Demons

Published in: BMC Infectious Diseases | Issue 1/2010

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Abstract

Background

Group B Streptococcus (GBS) serotype (Ia, Ib, II-IX) correlates with pathogen virulence and clinical prognosis. Epidemiological studies of seroprevalence are an important metric for determining the proportion of serotypes in a given population. The purpose of this study was to evaluate the prevalence of individual GBS serotypes at Madigan Healthcare System (Madigan), the largest military tertiary healthcare facility in the Pacific Northwestern United States, and to compare seroprevalences with international locations.

Methods

To determine serotype distribution at Madigan, we obtained GBS isolates from standard-of-care anogenital swabs from 207 women of indeterminate gravidity between ages 18-40 during a five month interval. Serotype was determined using a recently described molecular method of polymerase chain reaction by capsular polysaccharide synthesis (cps) genes associated with pathogen virulence.

Results

Serotypes Ia, III, and V were the most prevalent (28%, 27%, and 17%, respectively). A systematic review of global GBS seroprevalence, meta-analysis, and statistical comparison revealed strikingly similar serodistibution at Madigan relative to civilian-sector populations in Canada and the United States. Serotype Ia was the only serotype consistently higher in North American populations relative to other geographic regions (p < 0.005). The number of non-typeable isolates was significantly lower in the study (p < 0.005).

Conclusion

This study establishes PCR-based serotyping as a viable strategy for GBS epidemiological surveillance. Our results suggest that GBS seroprevalence remains stable in North America over the past two decades.
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Metadata
Title
Group B streptococcusserotype prevalence in reproductive-age women at a tertiary care military medical center relative to global serotype distribution
Authors
Danielle L Ippolito
Wesley A James
Deborah Tinnemore
Raywin R Huang
Mary J Dehart
Julie Williams
Mark A Wingerd
Samandra T Demons
Publication date
01-12-2010
Publisher
BioMed Central
Published in
BMC Infectious Diseases / Issue 1/2010
Electronic ISSN: 1471-2334
DOI
https://doi.org/10.1186/1471-2334-10-336

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