Table 3 The antimicrobial resistance rates, positive rates of virulence genes and of resistance genes among S.epidermidis clinical isolates with major ST types (%)
|  | ST466 (N = 20) | ST2 (N = 28) | ST130 (N = 16) | ST20 (N = 8) | ST59 (N = 12) |
|---|---|---|---|---|---|
Antimicrobials | |||||
 penicillin | 95(19) | 96.43(27) | 100.00(16) | 100.00(8) | 91(11) |
 tetracycline | 50.00(10) | 10.71(3) | 25.00(4) | 50.00(4) | 33.33(4) |
 ciprofloxacin | 15.00(3) | 82.14(23) | 25.00(4) | 50.00(4) | 33.33(4) |
 chloramphenicol | 30.00(6) | 25.00(7) | 12.50(2) | 12.50(1) | 0.00(0) |
 gentamicin | 20.00(4) | 82.14(23) | 25.00(4) | 0.00(0) | 33.33(4) |
 clindamycin | 30.00(6) | 67.86(19) | 50.00(8) | 25.00(2) | 41.67(5) |
 erythromycin | 80.00(16) | 82.14(23) | 68.75(11) | 87.50(7) | 83.33(10) |
SXTa | 60.00(12) | 71.43(20) | 100(16) | 0.00(0) | 41.67(5) |
 linezolid | 0.00(0) | 0.00(0) | 0.00(0) | 0.00(0) | 0.00(0) |
 vacomycin | 0.00(0) | 0.00(0) | 0.00(0) | 0.00(0) | 0.00(0) |
 Biofilm formation | 5.00(1) | 10.71(3) | 0.00(0) | 75.00(6) | 0.00(0) |
Virulence genes | |||||
 icaA | 0.00(0) | 85.71(24) | 0.00(0) | 62.50(5) | 0.00(0) |
 aap | 90.00(18) | 96.43(27) | 50.00(8) | 50.00(8) | 91.67(11) |
 sesI | 0.00(0) | 96.43(27) | 0.00(0) | 0.00(0) | 25.00(3) |
 ACME-arcA | 65.00(13) | 39.29(11) | 87.50(14) | 25.00(2) | 41.67(5) |
 IS256 | 15.00(3) | 82.14(23) | 43.75(7) | 25.00(2) | 33.33(4) |
 bhp | 30.00(6) | 10.71(3) | 0.00(0) | 0.00(0) | 50.00(6) |
 aae | 100.00(20) | 92.86(26) | 100.00(16) | 100.00(8) | 100.00(12) |
 altE | 100.00(20) | 96.43(27) | 100.00(16) | 100.00(8) | 100.00(12) |
 gehD | 25.00(5) | 67.86(19) | 12.50(2) | 62.50(5) | 33.33(4) |
Resistance genes | |||||
 mupA | 0.00(0) | 39.29(11) | 12.50(2) | 12.50(1) | 8.33(1) |
 qacA/B | 65.00(13) | 67.86(19) | 56.25(9) | 62.50(5) | 58.33(7) |