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SUMMARY Antibiotic multiresistant isolates of Staphylococcus aureus from outbreaks of nosocomial infection throughout Australia were found to possess essentially similar patterns of antibiotic resistance. Plasmid DNA profiles from these isolates exhibited a common pattern of large plasmids, of (15–22) × 106 mol. wt, associated with resistance to gentamicin, kanamycin and tobramycin, plasmids of 3 × 106 mol. wt, mediating resistance to chloramphenicol, and cryptic plasmids of 1 × 106 mol. wt. Restriction endonuclease digestion confirmed the presence of related plasmids in isolates from all the hospitals that were surveyed. The homogeneity of these organisms suggests the dissemination of a multiresistant, plasmid-bearing strain of S. aureus, or its derivatives, among geographically-separated hospitals in Australia.
Lyon et al. (Wed,) studied this question.