Distribution of virulence genes and phages within spa-defined CCs among furunculosis strains (A) and colonizing strains (B). luk-PV genes were detected in 85% of furunculosis strains, while their prevalence among nasal strains was below 1%. Furunculosis and colonizing strains did not differ in their SAg gene patterns. For a reliable construction of the consensus tree, some reference spa types were included in the BURP clustering (gray lettering). Virulence genes (SAg genes, agr, eta, etb, etd, luk-PV, and mecA) and phage types were determined by PCR. Staphylococcal enterotoxins (SEs) are indicated by single letters (a sea, etc.). ID, identifier; n.d., not determined.