TABLE 2.
Trends in resistance of ETEC O149:K91 isolates with time, as determined by the disk diffusion method
| ATMb | No. (%) of resistant ETEC O149:K91 isolatesa
|
||||
|---|---|---|---|---|---|
| 1978-1984 (n = 25) | 1985-1989 (n = 24) | 1990-1994 (n = 22) | 1995-2000 (n = 41) | Total (n = 112) | |
| AMP | 8 (32) | 2 (8) | 8 (36) | 25 (61) | 43 (38) |
| CTX | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) |
| XLN | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) |
| GEN | 1 (4) | 2 (8) | 1 (4) | 12 (29) | 16 (14) |
| NEO | 10 (40) | 5 (21) | 4 (18) | 20 (49) | 39 (35) |
| KAN | 10 (40) | 6 (25) | 8 (36) | 19 (46) | 43 (38) |
| TET | 22 (88) | 22 (92) | 21 (95) | 39 (95) | 104 (93) |
| CHL | 4 (16) | 1 (4) | 2 (9) | 17 (41) | 24 (21) |
| TMP | 1 (4) | 2 (8) | 2 (9) | 25 (61) | 30 (27) |
| SUL | 22 (88) | 24 (100) | 22 (100) | 34 (83) | 102 (91) |
a
Phenotypic resistance was overestimated because only isolates showing initial resistance to one antimicrobial were further analyzed.
b
ATM, antimicrobials; AMP, ampicillin; CTX, cefotaxime; XLN, ceftiofur; GEN, gentamicin; NEO, neomycin; KAN, kanamycin; TET, tetracycline; CHL, chloramphenicol; TMP, trimethoprim; SUL, sulfonamides.