OSCP-like (n=15) USA 300 (n=6) USA 400 (n=2) Other clonal group (n=2) Total (n=25) P Source Skin or soft tissue related 15 4 19   0.0012 Other sources 0 6 6 Origin CA-MRSA or HACO-MRSA 14 7 21 0.2668 HA-MRSA 1 3 4 Type of sccMec IVa and IVb 1 5 6 0.0225 IVc 14 5 19 PVL positive 15 0 16 0.0000 negative 0 9 9 Antibiotic resistance (other than methicillin) none 2 1 3 1.000 Any combination 13 9 22

Table 2: Characteristics of non-multidrug resistant methicillin-resistant Staphylococcus aureus from Porto Alegre, Brazil, according to clonal group