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rRNA operon analysis of MSSA and MRSA. (A) Among MSSA isolates, 180 of the 195 carried six rRNA operons (92.3%). Among MRSA isolates, 78 of the 146 carried six rRNA operons (53.4%). ***, P < 0.0001 (Fisher's exact test). (B) MRSA isolates were subdivided into HA-MRSA and CA-MRSA according to the criteria described in Materials and Methods. Of the 78 HA-MRSA isolates, 52 (66.7%) had five rRNA operon copies; 16 (23.2%) of the 69 CA-MRSA isolates had five operon copies.
