Table 1. The biofilm-forming abilities of the clinical staphylococcal isolates.
| Strainsa | Biofilm-negativeb (number (%)) | Biofilm-positiveb (number (%)) | ||
|---|---|---|---|---|
| - | + | ++ | +++ | |
| MRSA | 32 (57.6) | 15 (27.3) | 3 (6.0) | 5 (9.1) |
| MSSA | 22 (54.1) | 13 (33.3) | 3 (8.3) | 2 (4.3) |
| MRSE | 16 (37.2) | 11 (25.7) | 9 (20.0) | 8 (17.1) |
| MSSE | 10 (41.6) | 7 (29.2) | 3 (12.5) | 4 (16.7) |
a
Biofilm formation by the clinical isolates was assessed by semiquantitative assay with microtiter plates.
b
The clinical strains were classified into four groups according to their abilities to form biofilms as measured by OD570. The cutoff OD value (ODc) was 0.16. The four groups were as follows: no biofilm producer (−), OD570≤0.16; weak biofilm producer (+), 0.16<OD570≤0.32; moderate biofilm producer (++), 0.32<OD570≤0.64; and strong biofilm producer (+++), OD570>0.64.