Table 4.
Frequencies of virulence genes among methicillin-susceptible Staphylococcus aureus (MSSA) and methicillin-resistant S. aureus (MRSA) isolates.
| Virulence gene | S. aureus (n = 78) | MRSA (n = 27) | MSSA (n = 51) | P-valuea |
|---|---|---|---|---|
| pvl | 17.9 | 37.0 | 7.8 | < 0.05 |
| hla | 100 | 100 | 100 | |
| hlb | 57.7 | 88.9 | 41.2 | < 0.05 |
| hlg | 15.4 | 22.2 | 11.8 | > 0.05 |
| hlg2 | 84.6 | 81.5 | 86.3 | > 0.05 |
| bsa | 17.9 | 14.8 | 19.6 | > 0.05 |
| icaA | 100 | 100 | 100 | |
| clfA | 100 | 100 | 100 | |
| sdrC | 85.9 | 100 | 78.4 | < 0.05 |
| sdrD | 50 | 29.6 | 60.8 | < 0.05 |
| sdrE | 69.2 | 66.7 | 70.6 | > 0.05 |
| lukE | 89.8 | 77.8 | 96.1 | < 0.05 |
| lukM | 0 | 0 | 0 | |
| arcA | 0 | 0 | 0 | |
| tsst1 | 5.1 | 11.1 | 2.0 | < 0.05 |
| eta | 3.8 | 0 | 5.9 | > 0.05 |
| etb | 0 | 0 | 0 | |
| sea | 21.8 | 25.9 | 19.6 | > 0.05 |
| seb | 23.1 | 55.6 | 5.9 | < 0.05 |
| sec | 17.9 | 22.2 | 15.7 | > 0.05 |
| sed | 12.8 | 7.4 | 15.7 | > 0.05 |
| see | 20.5 | 14.8 | 23.5 | > 0.05 |
| seg | 20.5 | 7.4 | 27.5 | > 0.05 |
| seh | 5.1 | 3.7 | 5.9 | > 0.05 |
| sei | 23.1 | 11.1 | 29.4 | > 0.05 |
| sej | 6.4 | 0 | 9.8 | > 0.05 |
| sek | 19.2 | 55.6 | 0 | < 0.05 |
| seq | 19.2 | 55.6 | 0 | < 0.05 |
| sel | 5.1 | 7.4 | 3.9 | > 0.05 |
| sem | 21.8 | 11.1 | 27.5 | > 0.05 |
| sen | 21.8 | 11.1 | 27.5 | > 0.05 |
| seo | 21.8 | 11.1 | 27.5 | > 0.05 |
| sep | 20.5 | 14.8 | 23.5 | > 0.05 |
aThe positive rates of virulence genes among MRSA strains were compared to those among MSSA isolates.