We report a familial case of repetitive furunculosis due to Community-associated MRSA (CA-MRSA), disseminating from a male case to his wife, his son and his mother-in-law. Screening of samples from furuncles of the four cases showed methicillin-resistant
Staphylococcus aureus (MRSA). The results of PCR showed that all the isolates showed an identical antimicrobial susceptibility profile, carried type V SCC
mec, and harbored the pvl gene. In addition, the clonal relationship determined by pulsed field gel electrophoresis using
Sma I enzyme for genomic DNA digestion showed that isolates from all four cases displayed indistinguishable electrophoretic patterns. The cases were diagnosed as repetitive furunculosis due to CA-MRSA on the basis of the drug sensitivity pattern of MRSA isolated from the four cases and the positivity to Panton-Valentine leukocidine (PVL). In the two cases with atopic dermatitis, furunculosis due to CA-MRSA recurred despite long-term oral administration of trimethoprim-sulfamethoxazole.
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