SUMMARY: Strains of staphylococci were tested for lysogenicity and different ‘lysogenicity patterns’ were defined on the basis of the phage lytic spectra. The test of lysogenicity was used to indicate the pathogenicity, and to complement the phage-typing pattern. None of the coagulase-negative strains (65) carried a phage. The lysogenicity patterns of 76% of the coagulase-positive strains (122 tested) were determined. With the method of phage typing 80% of the coagulase-positive strains of staphylococci were classified. By using both methods (phage-typing and the test of lysogenicity) the classification of 92% of coagulase-positive strains was possible. Differentiation of identical phage-typing patterns was obtained by using lysogenicity patterns.


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