Abstract
Pasteurized fluid dairy products (998 samples) and raw milk samples from approximately 1200 producers in Southern Ontario (5574 samples) were examined by the disc assay method, having a sensitivity of 0.0125 unit of penicillin per milliliter of milk, for the presence of inhibitory substances during the period April–August, 1975. One pasteurized milk (0.1%) and 50 raw milk samples (0.9%) contained penicillin. No other antibiotics were detected. Results represent a significant decrease in the incidence of antibiotics in milk compared to reports during the 1950's.
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