[Studies of oral microbiocenosis. I. Incidence and properties of staphylocci in young persons].

The study of staphylococci in the buccodental washings of 117 second year students at the Faculty of Stomatology, all healthy youths aged 20-25 years, gave the following results: (I) stapphylococci were present in 90% of the students; (II) 50.66% were oral carriers of pathogenic staphylococcal strains; (III) in 23 cases two or more staphylococcal strains were found with different metabolic and biologic properties; (IV) part of the bucal lysozyme was of microbial origin since 95% of the coagulasopositive strains and 88% of the coagulasonegative strains produce lysozymes; (V) 35.23% of the strains yield staphylococcal active with regard to M. lysodeicticus; (VI) 56.19% of the staphylococcal strains were resistant to penicillin and/or tetracyclin, and 5 coagulopositive strains developed in media with a penicillin concentration of 800 u/ml; (VII) 85% of the coagulopositive staphylococci were sensitive to human anti-staphylococcal bacteriophages, the most frequent being phage type 77 of group III.