Clustering of Multiple Endemic Strains of Methicillin-ResistantStaphylococcus aureusin a Nursing Home: An 8-Year Study

Abstract
PFGE was performed on residents' first clinical MRSA isolate (n = 94) during 8 years. Sixty-one percent of the isolates were clustered in time (P< .05) and space (P< .05) (ie, 2 separate statistically significant tests). Isolates from individual units were genetically related, with only the occasional unrelated isolate.