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A method was devised and tested for a quantitative identification of microbial flora in foods. The colonies developing on the initial isolation plates were picked with sterile toothpicks and inoculated on a master plate in prearranged spacing and order. The growth on the master plates was then replicated on a series of solid-agar plates containing differential or selective agents. The characteristic growth and physiological responses of microbial isolates to penicillin, tylosin, vancomycin, streptomycin, chloramphenicol, neomycin, colistin, and to S S Agar, Staphylococcus Medium No. 110, and Potato Dextrose Agar were recorded, together with Gram reaction and cell morphology. This information was then fed into an IBM 1410 digital computer which grouped and analyzed each isolate into 10 microbial genera, or groups, according to the identification key. The identification scheme was established by use of reference culture studies and from the literature. This system was used to analyze the microbial flora in dover sole (Microstomus pacificus ) and ground beef. The method described in this article enables one to examine large numbers of microbial isolates with simplicity.

Application of Replica Plating and Computer Analysis for Rapid Identification of Bacteria in Some Foods