Colorex Chromogenic O157 CT

Colorex Chromogenic O157 CT

Colorex 0157 with Cefixime & Tellurite

This medium replaces the conventional Sorbitol MacConkey Agar that is reputed for high levels of false positives and the difficulty of colonial interpretation and differentiation. Colorex O157 is a chromogenic medium with a very high specificity (98% according to K.A. Bettelheim, 1998 J.Appl.Microbiol.85:425-428) for E.coli O157. To reduce the level of background flora, the medium is made selective by the addition of Cefixime and Potassium tellurite. Positive colonies exhibit a mauve colouration enabling easy interpretation amongst blue or colourless colonies of other bacteria.

Additional Information


Pack Size

Shelf Life (days)

Storage Conditions

2-8°C – Store in the dark




Fill Volume

Product Description

Organisms Ref. No Result
Escherichia coli 0157 NCTC 12900 Mauve colonies
Escherichia coli NCTC 12241 Inhibited


  PP3041 – Colorex O157 with Cafixime & Tellurite