Abstract
For enumerating viable bacteria in raw milk, the Petrifilm method was compared with the standard plate count method and Breed method. 1) The correlation coefficient between Petrifilm SM counts and Breed clump counts was 0.916, and the regression line, with a slope of 1.00 and an intercept of -0.11, was close to the line of equality. 2) On average, Petrifilm SM counts were 15% lower than plate counts, but the correlation coefficient between both counts was 0.972 and the regression line, with a slope of 0.92 and an intercept of 0.60, was close to the line of equality. 3) An incubation time of 48 hours in the Petrifilm method and plate count method was better than 24 or 72 hours. 4) The personal errors in the Petrifilm method were fewer than in the other methods.
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