Abstract
Nasal carriage in a hospital of strains of S. aureus resistant to 3 or more antibiotics was restricted almost entirely to ward inhabitants, pharmacists and operating theater staff. Within the wards, the distribution of strains having different resistances showed a complex pattern. It is suggested that these findings are due to the effect of 3 factors: the numbers in which different kinds of S. aureus are present; the differing ability to invade the nostrils which different kinds possess; the assistance or hindrance given to them by dust derived from antibiotics.

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