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Chameleon™ COLOREX™ O157

Chameleon™ COLOREX™ O157

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Chameleon™ COLOREX™ O157 prepared culture media plates by S²Media are manufactured using original CHROMagar™ raw materials. This selective chromogenic culture medium is intended for the qualitative detection and presumptive identification of Escherichia coli O157, including O157:H7, from food, veterinary, and environmental samples. Characteristic colony coloration facilitates rapid differentiation of E. coli O157 from non-target organisms, supporting food safety testing, outbreak investigation, and surveillance of Shiga toxin-producing E. coli (STEC). Presumptive isolates should be confirmed using appropriate biochemical, serological, or molecular methods.


👉 Key Performance Features:

  • Rapid Chromogenic Detection: E. coli O157 produces characteristic mauve colonies after 24 hours of incubation, while most non-O157 E. coli develop blue colonies.

  • Improved Differentiation: Distinct chromogenic reactions facilitate differentiation of E. coli O157 from non-target organisms and simplify interpretation compared with conventional Sorbitol MacConkey (SMAC) Agar.

  • Reduced Presumptive False Positives: Enhanced selectivity and chromogenic differentiation help distinguish E. coli O157 from organisms that may produce similar reactions on sMAC, including Proteus spp. and E. hermannii.

  • Demonstrated Sensitivity: Reported 89% sensitivity for detection of E. coli O157 in published performance evaluation.


👉 Finished product meets the following standards and references:

  • AOAC


🧫 Application Areas:

  • Food and beverage microbiology for the selective detection and presumptive identification of E. coli O157

  • Food safety and foodborne pathogen testing

  • Meat, dairy, and fresh produce microbiological testing

  • Veterinary and livestock microbiology

  • Agricultural and environmental monitoring

  • Water and wastewater testing

  • Public health and epidemiological surveillance

  • Foodborne outbreak investigation and source tracking

  • Microbiological quality control and regulatory compliance testing


Equivalent or Comparable to Item Numbers:

  • 214984

  • CHRP0008

  • M-0360

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