All MRSA strains (n = 21) expressed 7/15 studied genes: spa, clfB cna, bbp, sdrC, icaA, and agr. [group II (n = 18); group I (n = 3)] during in vitro infection of RHE (Table 2); 95.2% (n = 20) expressed sdrD and efb; 90.4% (n = 19) expressed fnbA, clfA, ebps, and eap; 85.7% (n = 18) expressed sdrE; and 80.9% (n = 17) expressed fnbB. This evidence concerns the gene PPP3CA and infection.