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A membrane filter-Endo agar method for enumerating Escherichia coli as distinct from other coliforms in drinking water was developed. Membranes containing coliform colonies are transferred to nutrient agar containing 4-methyl umbelliferyl-beta-D-glucuronide (MUG) and incubated at 35 degrees C for 4 h. The MUG is hydrolyzed by the glucuronidase of E. coli and the fluorogenic product is visualized. The method recovered 98% of E. coli without false positives and is proposed as an additional test in routine water examination for the detection of pollution.
Mates et al. (Fri,) studied this question.
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