Microbial Detection using Chromogenic Media

Rainbow® Agars are a simple selective and chromogenic medium to help you conveniently detect strains of E. coli O157, Shigella and Aeromonas with results in less than 24 hours!

E. coli O157

Rainbow Agar O157 has both selective and chromogenic properties that make it particularly useful for isolating pathogenic E. coli strains. The medium contains chromogenic substrates that are specific for two E. coli-associated enzymes: ß-galactosidase (a blue-black chromogenic substrate) and ß-glucuronidase (a red chromogenic substrate).

Shigella spp.

Rainbow Agar Shigella/Aeromonas was developed to directly isolate these important causative agents of gastroenteritis. The medium is inhibitory to gram-postive bacteria and most non-enteric gram- negative bacteria, but is not toxic to the target species. Most other enteric species including Escherichia coli are significantly inhibited, and colonies that grow are blue. Strains of all four Shigella species (sonnei, flexneri, boydii and dysenteriae) as well assome Aeromonas species (hydrophila, jandaei and tructi) grow as large or medium-sized orange-red colonies.

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