Another indicator of human to animal transmission is the presence of the Panton-Valentine leukocidin toxin genes lukF-PV and lukS-PV found in SA3 and the staphylokinase gene scn and staphylococcal complement inhibitor gene sak found in all MRSA isolates, which are strongly associated with human infections and sporadically have been found in livestock (33, –, 35). The gene discussed is SRI; the disease is infection.