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A collection of 216 well-characterized strains of Staphylococcus, Micrococcus and Stomatococcus was examined by a commercially available STAPHYtest system ( Lachema, Brno, Czechoslovakia). The results of STAPHYtest agreed with those of conventional tests. The STAPHYtest permitted a clear-cut separation of Staphylococcus from Micrococcus and Stomatococcus strains and correctly identified 104 of 145 (72%) Staphylococcus strains after 24 h of incubation. However, it allowed the identification only of 19 of 29 validly published Staphylococcus species. The STAPHYtest proved to be a simple and rapid system for the separation of staphylococci from micrococci and for the identification of most frequent clinically significant staphylococci. [ABSTRACT FROM AUTHOR]