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The Cellular Test for Pastuerized Milk under Practical Conditions¹

University of Wisconsin, Madison, Wisconsin

ABSTRACT

The "microscopic test for pasteurized milk" (Frost) has been applied to 260 of the routine milk samples analyzed by the laboratories of the Chicago Health Department during July, 1918. All of the 47 raw samples were correctly placed, although 11 showed indications of having been partly or partially heated. Twenty-six of the 2l3 pasteurized samples seemed to have been insufficiently pasteurized. Fourteen of these should be condemned by the high bacterial count. This leaves 12 out of the total (260), or about 4 per cent of the samples as being unsatisfactory in spite of the fact that they are supposed to have been pasteurized and have a low bacterial count. This investigation gives strong evidence that the method may be used to control pasteurized milk supplies with a high degree of accuracy and that the method requires neither expensive equipment nor unusual skill and is not excessively time-consuming.

¹ The work was done at the Laboratories of the Chicago Health Department through the courtesy of Dr. John Dill Robertson, Commissioner of health, and Dr. F. O. Tonney, Director of the Laboratories and made possible by the generosity of the Bowman Dairy Company of Chicago which furnished a fellowship in bacteriology at the University of Wisconsin for the year 1917-18.