Table 2.
Presence of biofilm formation and adhesion genes in methicillin-resistant coagulase-negative staphylococci
| Biofilm formation | Clinical samples | |||||
|---|---|---|---|---|---|---|
| S. haemolyticus (n=19) (%) | S. epidermidis (n=18) (%) | S. capitis (n=10) (%) | S. cohnii (n=5) (%) | S. hominis (n=3) (%) | Total (n=55) (%) | |
| CRA | ||||||
| Red (%) | 0 | 2 (11.1) | 2 (20) | 3 (60) | 0 | 7 (12.7) |
| Black (%) | 12 (63.2) | 8 (44.4) | 4 (40) | 1 (20) | 2 (66.7) | 27 (49.1) |
| Very black (%) | 7 (36.8) | 8 (44.4) | 4 (40) | 1 (20) | 1 (33.3) | 21 (38.2) |
| MTP | ||||||
| Negative (%) | 18 (94.7) | 9 (50) | 1 (10) | 4 (80) | 2 (66.7) | 34 (61.8) |
| Low-grade positive (%) | 1 (5.3) | 7 (38.9) | 9 (90) | 1 (20) | 1 (33.3) | 19 (34.5) |
| Highly positive (%) | 0 | 2 (11.1) | 0 | 0 | 0 | 2 (3.6) |
| Adhesion genes | ||||||
| icaAD (%) | 0 | 4 (22.2) | 6 (60) | 0 | 0 | 10 (18.2) |
| bap (%) | 0 | 1 (5.6) | 5 (50) | 1 (20) | 0 | 7 (12.7) |
| fnbA (%) | 8 (42.1) | 15 (83.3) | 0 | 3 (60) | 0 | 26 (47.3) |
| cna (%) | 4 (21.1) | 10 (55.6) | 0 | 1 (20) | 0 | 15 (27.3) |
| mecA genes | 19 (100) | 18 (100) | 10 (100) | 5 (100) | 3 (100) | 55 (100) |
S. haemolyticus: Staphylococcus haemolyticus, S. epidermidis: Staphylococcus epidermidis, S. capitis: Staphylococcus capitis, S. cohnii: Staphylococcus cohnii, S. hominis: Staphylococcus hominis, CRA: Congo red agar, MTP: Microtiter plate