Table 2. Molecular characteristics of Staphylococcus aureus isolates from implant-associated infection (IAI) isolates and skin and soft tissue infection (SSTI) isolates.
| Molecular Characteristic | All isolates | IAI isolates | SSTI isolates | P |
|---|---|---|---|---|
| n = 235 (%) | n = 47 (%) | n = 188 (%) | ||
| MRSA | 122 (52) | 13 (28) | 109 (58) | 0.001 |
| MSSA | 113 (48) | 34 (72) | 79 (42) | |
| USA300a | 139 (59) | 8 (17) | 131 (70) | <0.0001 |
| agr group | n = 233 (%) | n = 47 (%) | n = 186 (%) | |
| I | 173 (74) | 21 (45) | 152 (82) | <0.0001b |
| II | 34 (15) | 19 (40) | 15 (8) | |
| III | 17 (7) | 6 (13) | 11 (6) | |
| IV | 8 (3) | 0 | 8 (4) | |
| NT | 1 (0) | 1 (2) | 0 | |
| MLST | n = 233 (%) | n = 47 (%) | n = 186 (%) | |
| 8 | 137 (59) | 11 (23) | 126 (68) | <0.0001c |
| 5 | 19 (8) | 11 (23) | 8 (4) | |
| 72 | 6 (3) | 1 (2) | 5 (3) | |
| 30 | 6 (3) | 3 (6) | 3 (2) | |
| 121 | 5 (2) | 0 | 5 (3) | |
| 45 | 5 (2) | 2 (4) | 3 (2) | |
| 15 | 4 (2) | 3 (6) | 1 (1) | |
| 188 | 4 (2) | 3 (6) | 1 (1) | |
| 508 | 3 (1) | 1 (2) | 2 (1) | |
| Other (36 STs) | 39 (17) | 10 (21) | 29 (16) | |
| NT | 5 (2) | 2 (4) | 3 (2) | |
| pvl positive | 143 (61) | 7 (15) | 136 (72) | <0.0001 |
NT, nontypeable
aOne IAI isolate was not typable by pulsed-field gel electrophoresis
bConditional logistic regression comparing agr group I (1) to agr groups II, III, and IV (0), odds ratio 0.17, 95% confidence interval 0.08–0.36
cConditional logistic regression comparing sequence type (ST)8 (1) to all other STs (0), odds ratio 0.12, 95% confidence interval 0.05–0.29