Samples of raw and pasteurized milk were plated in desoxycholate lactose agar and incubated at 32 C ± 1.0 and 37 C ± 1.0 for enumeration of coliform bacteria. The lower temperature produced counts comparable to those at 37 C. Pasteurized samples yielded coliform-type bacteria which had 5 different IMViC test patterns, wheras 6 patterns were found among the isolates from raw milk. The most predominant pattern was − + + + and existed among 33% of the isolates.

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Author notes

1Contribution from the University of Missouri Experiment Station. Journal Series Number 5562.