Clonal Comparison ofStaphylococcus aureusIsolates from Healthy Pig Farmers, Human Controls, and Pigs

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Abstract
Pig farming is a risk factor for increased nasal Staphylococcus aureus colonization. Using sequence typing and phylogenetic comparisons, we showed that overcolonization of farmers was caused by a few bacterial strains that were not present in nonfarmers but often caused swine infections. This finding suggests a high rate of strain exchange between pigs and farmers.