“…The latter include members of the genera Cedecea, Citrobacter, Enterobacter, Escherichia, Hafnia, Klebsiella, Kluyvera, Rahnella, Salmonella III, Serratia, and Yersinia. Recently, chromogenic substrate assays based on the enzymatic activities of -glucuronidase for the rapid identification of E. coli in urine (2), food (4,15,16), and water (6,10,16) and that of -galactosidase for the coliform group in food (5) and water (12) have been assessed. However, 5-bromo-4-chloro-3-indolyl--D-glucuronide cyclohexylammonium salt (13,15,16) for E. coli and 5-bromo-3-indolyl--D-galactoside (5,12) for -galactosidase-positive Enterobacteriaceae have not been evaluated directly for use with urine samples.…”