Colorex™ Strep B Agar

Colorex™ Strep B Agar

About a quarter of pregnant women in the UK are estimated to carry Streptococcus agalactiae. As a result of this, babies become colonized with Streptococcus agalactiae (GBS) during labour and birth; the vast majority are unaffected by this colonization, however, a small percentage become infected with conditions such as eye infections, pneumonia, septicaemia or meningitis. Colorex™ StrepB Agar is a chromogenic media that presumptively identifies Streptococcus agalactiae (mauve/red colonies) after 18-24 hours incubation in aerobic conditions. Enterococci are differentiated by the formation of blue colonies; other organisms are inhibited or colourless.

NB: Some strains of Group A, C & G streptococci may also produce mauve colonies. Therefore, final identification may require additional testing.

Additional Information


Pack Size

Shelf Life (days)

Storage Conditions

2-8°C – Store in the dark




Fill Volume

Product Description

Organisms Ref. No Result
Enterococcus faecalis NCTC 12697 Blue colonies
Streptococcus agalactiae ATCC 12386 Mauve / red colonies
Escherichia coli NCTC 12241 Inhibited
Staphylococcus aureus NCTC 12981 Inhibited

  PP3065 – Colorex Strep B Agar