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. 2011 Mar;84(3):490-1.
doi: 10.1016/j.mimet.2011.01.014. Epub 2011 Jan 21.

Evaluation of CHROMagar™ StrepB agar, an aerobic chromogenic medium for prepartum vaginal/rectal Group B Streptococcus screening

Didier-Marc Poisson  1 , Marie-Liesse Evrard, Claire Freneaux, Marie-isabelle Vivès, Louis Mesnard
Affiliations

Evaluation of CHROMagar™ StrepB agar, an aerobic chromogenic medium for prepartum vaginal/rectal Group B Streptococcus screening

Didier-Marc Poisson et al. J Microbiol Methods. 2011 Mar.

Abstract

An aerobic chromogenic medium, CHROMagar™ StrepB agar, designed for isolation of group B Streptococci, was evaluated on 285 prepartum vaginal/rectal swabs from pregnant women. After overnight enrichment in Todd-Hewitt broth containing 15μg/ml nalidixic acid and 10μg/ml colistin, sensitivities were respectively 79% on day 1 and 92% on day 2, and significantly higher than those achieved by blood agar (40% and 58%) and colimycin-nalidixic-acid agar (82% on day 2).

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