TABLE 2.
Rates of resistance to clindamycin among B. fragilis group isolates by species and year
| Yr | Resistance | No. (%) of strains susceptible or resistant to clindamycin
|
|||||
|---|---|---|---|---|---|---|---|
| B. fragilis | B. distasonis | B. ovatus | B. thetaiotaomicron | B. vulgatus | Other B. fragilis group spp.a | ||
| 1992 | Rb | 4 (10.5) | 1 (9.1) | 4 (16.7) | 0 (0) | 1 (4.0) | 3 (11.5) |
| S/Ic | 34 (89.5) | 10 (90.9) | 20 (83.3) | 34 (100) | 24 (96.0) | 23 (88.5) | |
| 1993 | R | 5 (8.5) | 2 (11.8) | 1 (4.0) | 4 (10.3) | 3 (12.5) | 0 (0) |
| S/I | 54 (91.5) | 15 (88.2) | 24 (96.0) | 35 (89.7) | 21 (87.5) | 22 (100) | |
| 1994 | R | 2 (4.3) | 2 (18.2) | 3 (18.8) | 5 (18.5) | 1 (7.7) | 2 (20.0) |
| S/I | 45 (95.7) | 9 (81.8) | 13 (81.3) | 22 (81.5) | 12 (92.3) | 8 (80.0) | |
| 1995 | R | 2 (4.7) | 0 (0) | 2 (11.8) | 3 (10.7) | 5 (18.5) | 0 (0) |
| S/I | 41 (95.3) | 11 (100) | 15 (88.2) | 25 (89.3) | 22 (81.5) | 22 (100) | |
| 1996 | R | 8 (14.5) | 1 (10.0) | 5 (17.2) | 5 (21.7) | 3 (17.6) | 3 (15.8) |
| S/I | 47 (85.5) | 9 (90.0) | 24 (82.8) | 18 (78.3) | 14 (82.4) | 16 (84.2) | |
| 1997 | R | 8 (19.0) | 2 (20.0) | 3 (13.0) | 6 (23.1) | 2 (9.5) | 6 (30.0) |
| S/I | 34 (81.0) | 8 (80.0) | 20 (87.0) | 20 (76.9) | 19 (90.5) | 14 (70.0) | |
| Total | R | 29 (10.2) | 8 (11.4) | 18 (13.4) | 23 (13.0) | 15 (11.8) | 14 (11.8) |
| S/I | 255 (89.8) | 62 (88.6) | 116 (86.6) | 154 (87.0) | 112 (88.2) | 105 (88.2) | |
a
Other B. fragilis group spp. include B. uniformis, B. eggerthii, B. caccae, B. stercoris, and two strains reported as indole-positive B. fragilis.
b
R, resistant.
c
S/I, susceptible or intermediate.