The isolate from the infant ( S1 , isolated from a tracheal sample ) and 7 isolates from the 6 health care workers ( S2 , isolated from skin lesions of 1 physician ; S4 and S5 , from nasal and anal samples from another physician ; and S3 , S6 , S7 , and S8 , from nasal samples from 4 nurses ) were genotyped and analyzed for the presence of the PVL gene.