Colorex STEC

COLOREX™ STEC is a chromogenic medium(1) for the detection of enterohaemorrhagic E. coli (including serotypes O26, O111 & O157). Over the past few years there has been an increase in the number of food poisoning outbreaks where non-O157 Shiga toxin producing E. coli (STEC) have been shown to be etiological agent.
The medium contains several selective agents to reduce the level of background flora from the specimen or food
sample. Positive STEC colonies exhibit a mauve colouration enabling easy interpretation amongst other Gram negative bacteria that will exhibit blue or colourless colonies, if they are able to grow on the medium. Gram positive bacteria will be inhibited.

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 O157 NCTC 12900 Mauve colonies
Escherichia coli NCTC 12241  Inhibited
Staphylococcus aureus NCTC 12981  Inhibited


Recommended incubation: Incubate aerobically at 37 ± 1°C for 18-24 hours.