TABLE 3.
Characteristics of Shigella sp. clinical isolatesa
| Shigella sp. | Subgroupb | β-Lactamase profile
|
CAT | DHFR | ||
|---|---|---|---|---|---|---|
| pI | TEM | OXA | ||||
| S. flexneri | F1 (4) | Ca. 7 | − | + | + | Ia |
| F2 (1) | Ca. 7 | − | + | + | Ia | |
| F3 (1) | ND | ND | ND | ND | ND | |
| F4 (2) | Ca. 7 | − | + | + | Ia | |
| F5 (1) | Ca. 7 | − | + | + | ND | |
| F6 (2) | Ca. 5.4 | + | − | + | VII | |
| F7 (1) | ND | ND | ND | ND | ND | |
| F8 (1) | ND | ND | ND | ND | Ia | |
| F9 (1) | ND | ND | ND | ND | ND | |
| S. sonnei | S1 (2) | ND | ND | ND | ND | Ia |
| S2 (1) | Ca. 5.4 | + | − | ND | Ia | |
| S. dysenteriae | D1 (3) | Ca. 7 | − | + | + | Ia |
a
CAT, chloramphenicol acetyltransferase; DHFR, dihydrofolate reductase; ND, not determined; −, absent; +, present.
b
Number of strains analyzed in each subgroup is shown in parentheses.