We had a couple of groupings of MRSA where I work. All of the nurses, docs, RTs etc were tested for MRSA. Apparently there was some cross contamination going on with patients that we didn't know had MRSA. Now any patient admitted to the unit gets a nasal swab for MRSA so we can pinpoint carriers earlier and take the appropriate isolation steps to assist in avoiding the cross contamination. Good handwashing continues, of course