were observed. Phenotypic differentiation of bacterial species was done as described by Piepers et al. (2007). Staphylococci were identified presumptively based on colony morphology, Gram stain, and positive catalase test. Staphylococcus aureus was differentiated from other Staphylococcus spp. based on morphology, pigmentation, hemolysis, and DNase activity. All nonStaphylococcus aureus staphylococci were a priori con-