Group B streptococcal colonization in prepubertal children.

Colonization of prepubertal boys and girls with group B streptococci was studied prosepctively for one year. Throat, anal canal, and vaginal cultures were obtained from 415 children not receiving antimicrobics. The over-all colonization rate at any site was 11.3% and did not vary with age, sex, or season. Streptococci were recovered most commonly from the anal canal. Throat colonization was comparable in boys and girls. A total of 71 sites were positive for the organism in the 47 colonized children. Serotype Ia was the most common (41% of isolates). Types II and III accounted for 24% and 20%, respectively. Colonization at more than one site occurred in 20 children and in two of these children, different serotypes were recovered from different sites.