Abstract
The incidence of penicillin in the pasteurized milk marketed in Amherst, Massachusetts was found relatively high when compared with the findings in earlier state and national surveys.Twenty-five or 20.5 percent of 122 samples were found positive. Of these, fifteen or 12.3 percent of the total were detected by the ¼″ disc assay method of Difco. The ½″ disc was found more sensitive as with it ten additional positive samples were detected.
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