This is a differential medium for the isolation of Escherichia coli O157:H7. It differs from other MacConkey media in that lactose has been replaced by sorbitol. As Escherichia coli O157:H7 does not ferment sorbitol, it produces pale translucent colonies whereas most other strains of Escherichia coli do ferment sorbitol and produce pink colonies.
- Storage temperature: 2 to 8°C
- Appearance: firm gel
- Colour: pale red, violet tinge
- Recommended incubation: aerobically at 37°C ± 1°C for 16 to 24 hours
- Plate size: 90mm
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