Bacteriophage Types and Antibiotic Susceptibility of Staphylococcus aureus

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Abstract
Bacteriophage typing and antibiotic sensitivity tests were done on 254 strains of Staphylococcus aureus isolated in 1967, and results were compared with those of earlier studies. The proportion of group 1 strains decreased and those of group 3 increased among both outpatients and hospitalized patients, and from all except respiratory sources. Strains of groups 1 and 3 were more resistant than others to the commonly used antibiotics. Kanamycin sulfate-resistant strains were predominantly group 3 and from hospitalized patients. In 1967, resistance to penicillin G sodium was equally prevalent among outpatients and hospital strains. Increased resistance to other antibiotics was associated with prolonged hospitalization, particularly with prior antibiotic therapy. Group 1 strains were less, and others more, prevalent in 1967 than in 1959 to 1960. Resistance to the commonly used antibiotics increased among outpatient strains and, except for penicillin, decreased among hospital strains. Some reports have indicated a decreasing frequency of

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