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The dominant methicillin-resistant Staphylococcus aureus clone from hospitals in Cape Town has an unusual genotype: ST612.

There is currently limited information available on the molecular epidemiology of methicillin-resistant Staphylococcus aureus (MRSA) in South Africa. A molecular characterization of 100 MRSA from five hospitals in Cape Town was carried out in this study. The strains were separated into six clusters by pulsed-field gel electrophoresis, indicating transmission of MRSA between local hospitals. None of the strains carried the Panton-Valentine Leukocidin gene. SCCmec typing, multilocus sequence typing and spa typing were used to further characterize the MRSA. Three clones corresponded to frequently described pandemic clones: ST239-MRSA-III, ST36-MRSA-II and ST5-MRSA-I. ST239-MRSA-III and ST36-MRSA-II were minor clones and collectively accounted for 16% of the isolates. ST5-MRSA-I was the second-most prevalent clone and accounted for 37% of the isolates. The dominant local clone was the infrequently described ST612-MRSA-IV (44% of isolates), which has only been described in South Africa and Australia.