Patent ID: 7273719

Claim:
A test medium for detecting, quantifying or differentiating general coliforms, E. coli, Aeromonas spp. and Salmonella spp., said test medium comprising: a β-D-glucuronide substrate, which forms a first product in the presence of E. coli; an α-D-galactoside chromogenic substrate, which forms a second product in the presence of the Salmonella ; and a β-D-galactoside chromogenic substrate, which forms a third product in the presence of Aeromonas , said products of said α-D-galactoside and said β-D-galactoside substrates combining to form a color in the presence of general coliforms, so that general coliforms, E. coli, Aeromonas , and Salmonella are distinguishable from one another.