Table 3 Prevalence of toxin genes, agr groups, and biofilm formation in S. aureus isolates from the two groups
|  | Infectious Group N = 30 | Non-infectious Group N = 75 | χ2 P-Value | MRSA N = 59 | MSSA N = 46 | χ2 P-Value | Total N = 105 |
|---|---|---|---|---|---|---|---|
tsst-1 | 4(13.3%) | 12(16%) | .732 | 13(23.2%) | 3(6.5%) | .028 | 16(15.2%) |
pvl | 2(6.6%) | 1(1.33) | .138 | 0 | 3(6.5%) | .047 | 3(2.8%) |
Eta | 3(10%) | 11(14.6%) | .525 | 7(11.8%) | 7(15.2%) | .616 | 14(13.3%) |
etb | 3(10%) | 5(6.6%) | .561 | 2(3.3%) | 5(10.8%) | .127 | 7(6.6%) |
hlaα | 12(40%) | 47(62.6%) | .034 | 38(64.4%) | 21(45.6%) | .055 | 59(56.1%) |
psmα | 20(66.6%) | 46(61.3%) | .609 | 38(64.4%) | 28(60.8%) | .710 | 66(62.8%) |
agr I | 11(36.6%) | 41(54.6%) | .096 | 25(42.3%) | 27(58.6%) | .097 | 52(49.5%) |
agr II | 9(30%) | 14(18.6%) | .205 | 10(16.9%) | 13(28.2%) | .164 | 23(21.9%) |
agr III | 4(13.3%) | 8(10.6%) | .698 | 11(18.6%) | 1(2.1%) | .008 | 12(11.4%) |
agr IV | 3(10%) | 12 (16%) | .427 | 10(16.9%) | 5(10.8%) | .377 | 15(14.2%) |
S-biofilm | 6(20%) | 19(25.3%) | .562 | 19(32.2%) | 6(13%) | .022 | 25(23.8%) |
M-biofilm | 15(50%) | 44(58.6%) | .419 | 24(40.6%) | 35(76%) | .000 | 59(56.1%) |
W-biofilm | 6(20%) | 9(12%) | .290 | 13(22%) | 2(4.3%) | .010 | 15(14.2%) |
No-biofilm | 3(10%) | 3(4%) | .231 | 3(5%) | 3(6.5%) | .757 | 6(5.7%) |