Rapid identification of pregnant women heavily colonized with group B streptococci

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Abstract

Pregnant women admitted to Tampa General Hospital, Tampa, Fla., were cultured for group B streptococci (GBS). Culture swabs were placed into enriched, selective Todd-Hewitt medium and were quantitated for GBS. The broth cultures were tested by slide coagglutination before incubation and after 5 and 20 h of incubation. Fifty-four (27%) of the 201 maternity patients cultured were positive for GBS and were identified as such by slide coagglutination. A strong correlation was found between the magnitudes of colonization and the times required to identify the broth cultures as GBS positive. Cultures from mothers heavily colonized (mean concentrations of 3 x 104 GBS per culture swab or greater) were identified after 5 h or less of incubation. Mothers lightly colonized with GBS (mean concentrations of 2 x 102 GBS per culture swab) were identified only after their broth cultures had been incubated for 20 h.

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Jones, D. E., Friedl, E. M., Kanarek, K. S., Williams, J. K., & Lim, D. V. (1983). Rapid identification of pregnant women heavily colonized with group B streptococci. Journal of Clinical Microbiology, 18(3), 558–560. https://doi.org/10.1128/jcm.18.3.558-560.1983

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