TABLE 1.
Characterization of S. sonnei isolates used in this study
| Group | PFGE pattern | Presence of integrase gene:
|
Antibiograma | No. of isolates in:
|
||||
|---|---|---|---|---|---|---|---|---|
| intI1 | intI2 | intI3 | 1998 | 1999 | 2000 | |||
| S1 | A | − | + | − | TcSmSuTpNa | 27 | 4b,c | 1b |
| S2 | B | − | + | − | TcSmSuTpNaKm | 1b | 0 | 0 |
| S3 | A | − | + | − | SmTpNa | 1 | 0 | 0 |
| S4 | A | + | + | − | TcSmSuTpNaAp | 0 | 10 | 0 |
| S5 | A | − | + | − | TcSmSuTpNaAp | 1b | 0 | 0 |
| S6 | C | − | + | − | TcSmSuTpNaApKm | 2b | 0 | 0 |
| S7 | D | − | + | − | TcSmSuTpApKm | 0 | 0 | 20 |
a
Abbreviations of antimicrobial agents: Tc, tetracycline; Sm, streptomycin; Su, sulfamethoxazole; Tp, trimethoprim; Na, nalidixic acid; Km, kanamycin; Ap, ampicillin.
b
Eight isolates were collected from sporadic cases.
c
Of the four isolates, three were isolated from sporadic cases and one was isolated from the outbreak.