Antibiotic susceptibility of Staphylococcus aureus

Over 250 strains of Staphylococcus aureus isolated from patients who presented with infections acquired outside the hospital were tested for susceptibility to penicillin G, minocycline and erythromycin. Only 15.5% of strains could be regarded as sensitive to penicillin, whereas 99.2% and 90.2% were sensitive to minocycline and erythromycin respectively. Beta-haemolytic streptococci were found in association with Staph, aureus in 17.5% of the lesions cultured in this survey. The susceptibility of a further 100 strains of methicillin-sensitive Staph, aureus to a wider range of antimicrobial agents was also examined.