TABLE 1.
Main resistance phenotypes of serotype Typhimurium (1989–1997)
| Resistance phenotypea | No. of isolates for yr:
|
Total no. | |||||
|---|---|---|---|---|---|---|---|
| 1989 | 1991 | 1993 | 1995 | 1996 | 1997 | ||
| Susceptible | 10 | 7 | 16 | 8 | 7 | 6 | 54 |
| S | 2 | 1 | 2 | 1 | 7 | 12 | 25 |
| Su | 0 | 1 | 2 | 1 | 3 | 2 | 9 |
| T | 1 | 0 | 1 | 0 | 0 | 1 | 3 |
| ST | 2 | 3 | 1 | 3 | 6 | 6 | 21 |
| SSu | 2 | 5 | 6 | 4 | 14 | 19 | 50 |
| SSuT | 6 | 5 | 1 | 2 | 2 | 3 | 19 |
| STFu | 2 | 3 | 1 | 0 | 0 | 4 | 10 |
| SSuTFu | 0 | 1 | 3 | 1 | 1 | 2 | 8 |
| SSuTSxt | 0 | 1 | 3 | 4 | 3 | 7 | 17 |
| SSuTGKNx | 0 | 0 | 0 | 0 | 1 | 0 | 1 |
| ASSu | 0 | 1 | 1 | 4 | 0 | 0 | 6 |
| ASSuT | 0 | 4 | 1 | 2 | 2 | 4 | 13 |
| ASSuTSxt | 0 | 0 | 3 | 1 | 2 | 1 | 7 |
| ASSuTGKNx | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
| ACSSuT | 1 | 1 | 2 | 5 | 0 | 0 | 9 |
| ACSSuTAmc | 0 | 1 | 1 | 4 | 1 | 0 | 7 |
| ACSSuTFu | 0 | 0 | 0 | 0 | 3 | 6 | 9 |
| ACSSuTAmcFu | 0 | 1 | 3 | 15 | 21 | 3 | 43 |
| ACSSuTAmcFu+ | 0 | 1 | 2 | 5 | 5 | 3 | 16 |
| Total | 26 | 35 | 49 | 60 | 78 | 80 | 328 |
a
A, ampicillin; T, tetracycline; S, streptomycin; Su, sulfonamides; Fu, nitrofurantoin; C, chloramphenicol; Sxt, cotrimoxazole; Amc, amoxicillin-clavulanic acid; Nx, nalidixic acid; G, gentamicin; K, kanamycin; +, any other antibiotic. Intermediate and high resistance are grouped together.