TABLE 1.
Resistance profiles of the 280 MRSA strains studied and associated PFGE types
| RP | Susceptibility toa:
|
Total no. of isolates | PFGE type(s) (no. of isolates) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| GEN | ERY | CLI | TOB | TET | RIF | SXT | |||
| I | S | S | S | S | S | S | S | 46 | J (40); M (5); E (1) |
| II | S | R | R | S | S | S | S | 179 | J (178); M (1) |
| III | S | S | S | S | S | R | S | 1 | J (1) |
| IV | S | S | S | S | S | S | R | 2 | D (2) |
| V | S | R | R | S | R | S | S | 4 | J (4) |
| VI | S | R | R | S | S | R | S | 1 | J (1) |
| VII | S | R | R | R | S | S | S | 8 | M (2); C (6) |
| VIII | S | R | R | R | S | R | S | 3 | M (2); J (1) |
| IX | S | R | R | S | R | R | R | 1 | B (1) |
| X | S | R | R | R | R | R | R | 7 | B (7) |
| XI | R | R | R | R | R | R | S | 2 | A (1); F (1) |
| XII | R | R | R | R | R | R | R | 26 | B (25); G (1) |
a
MIC breakpoints, expressed in μg/ml, used for the definition of categories of susceptible (S), intermediate (I), and resistant (R), were those recommended by CLSI: GEN, ≤4, 8, and ≥16; ERY, ≤0.5, 1 to 4, and ≥8; CLI, ≤0.5, 1 to 2, and ≥4; TOB, ≤4, 8, and ≥16; TET, ≤4, 8, and ≥16; RIF, ≤1, 2, and ≥4; SXT, ≤2/38, — (intermediate breakpoint not applicable to SXT per CLSI), and ≥4/76, respectively.