A COMPARATIVE STUDY OF SIX AGARS PROPOSED FOR BACTERIAL PLATE COUNTS OF MILK

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Abstract
Because of faults noted by laboratory workers in the current A.P.H.A. Standard Methods agar, the Committee on Applied Laboratory Methods of the I.A.M.F.S. sponsored this study of proposed substitute agars. The Standard agar, another agar containing skim milk, and four agars without skim milk were tested simultaneously on 505 milk samples in a total of ten laboratories. The productivities of the five proposed new media were compared with that of the Standard Medium, with due consideration being given to effects of size of counts, differences among laboratories, and dilutions used. Agars without skim milk can be prepared which possess more desirable attributes than, and colony counts at least as great as, the Standard medium.

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