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The nasal carrier-rate of Staphylococcus aureus in 548 Nigerians aged 9–32 years and attending various educational establishments was 56·4%. This rate decreased with increasing age. A significantly greater proportion of females (65·0%) than males (46·5%) were carriers, but the excess in females was apparent only in subjects aged >20 years. Mucoid strains of S. aureus, which gave a negative slide-coagulase reaction, were found in 21·5% of carriers aged 10–15 years, but were absent from members of other age-groups. A considerable proportion of all the strains tested were resistant to commonly used antibiotics.
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