Antibodies to capsular polysaccharides of group B Streptococcus in pregnant Canadian women: relationship to colonization status and infection in the neonate. |
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Authors: | H D Davies C Adair A McGeer D Ma S Robertson M Mucenski L Kowalsky G Tyrell C J Baker |
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Affiliation: | Departments of Microbiology and Infectious Disease, Pediatrics, and Community Health Sciences and Child Health Research Unit, Alberta Children's Hospital, University of Calgary, Calgary,T2T-5C7, Canada. dele.davies@crha-health.ab.ca |
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Abstract: | In a cohort study of 1207 pregnant women in Alberta, Canada, the serotype distributions of vaginal-rectal group B Streptococcus (GBS) isolates were compared with all isolates from neonates with invasive GBS disease identified by population-based surveillance. Serum concentrations of Ia, Ib, II, III, and V capsular polysaccharide (CPS)-specific IgG also were determined, according to serotype of the vaginal-rectal colonizing GBS strain. GBS colonization was detected in 19.5% (235 of 1207) of women. Serotype III accounted for 20.6% (48 of 233) of colonizing strains available for typing but for 37% (27 of 73) of invasive isolates from neonates (P<.01). Maternal colonization with type III was least likely to be associated with moderate concentrations of III CPS-specific IgG. Serotype III GBS is more invasive than other serotypes in this population; this may be due, at least in part, to poor maternal type III CPS-specific antibody response. |
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