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Characteristics of the isolates included in the study
| Years | Number of isolates | Susceptibility pattern | Class 2 integron |
| 1971–1980 | 5 | Susceptible | Negative |
| 4 | SmSuTc | " | |
| 3 | SmSu | " | |
| 1 | SmSuCmTc | " | |
| 1 | SmSuCm | " | |
| 1 | Su | " | |
| 1981–1990 | 7 | SmSuTcTp | Positive |
| 1 | ApSmSuTcTp | Positive | |
| 1991–2000 | 5 | SmSuTcTp | Positive |
| 1 | SmSuTcTp | Negative | |
| 2 | SmSuTp | Positive |
Ap = ampicillin; Cm = cloramphenicol; Sm = streptomycin; Su = sulfonamides; Tc = tetracycline; Tp = trimethoprim
