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Bar graph of number of neonatal intensive care unit patients infected or colonized with methicillin-resistant Staphylococcus aureus (MRSA) during each quarter of the study period. Three healthcare worker surveillance efforts are indicated by arrows. The periods when predominant MRSA clones were detected are shown. CA-MRSA, community-associated MRSA; HA-MRSA, healthcare-associated MRSA.
