E.coli resistant to quinolones (nalidixic acid = NA and norfloxacin = NOR), Trimethoprim-Sulfamethoxazole (Co-trimoxazole) = SXT, tetracyclines = TE and amplicillin = AM. Kirby-Bauer test on Mueller-Hinton agar.

Cultivation 18 hours, 37°C in an aerobic atmosphere.