TABLE 1.
Details of environmental strains of V. cholerae possessing virulence genes isolated in this study
| Strain | Date of isolation (mo/day/yr) | Source | Serogroup | Ribotypea | Presence of virulence gene:
|
|||
|---|---|---|---|---|---|---|---|---|
| ctxAB | tcpAb | toxR | toxT | |||||
| SCE4 | 7/7/97 | Plankton, freshwater lake | O8 | A | − | + | + | + |
| SCE5 | 7/7/97 | Plankton, freshwater lake | O11 | A | − | + | + | + |
| SCE6 | 7/7/97 | Plankton, freshwater lake | O8 | A | − | + | + | + |
| SCE188 | 12/2/97 | Water, fish farm | O44 | F | + | − | + | + |
| SCE200 | 12/2/97 | Water, fish farm | O44 | ND | + | − | + | + |
| SCE201 | 12/2/97 | Water, fish farm | O44 | ND | + | − | + | + |
| SCE223 | 1/8/98 | Plankton, freshwater pond | O27 | G | + | − | + | + |
| SCE225 | 1/8/98 | Plankton, freshwater pond | O35 | B | − | + | + | − |
| SCE226 | 1/8/98 | Plankton, freshwater pond | O35 | G | − | + | + | − |
| SCE227 | 1/8/98 | Water, fish farm | O35 | B | − | + | + | − |
| SCE228 | 1/8/98 | Plankton, fish farm | O35 | B | − | + | + | − |
| SCE256 | 2/10/98 | Water, fish farm | O42 | C | − | + | + | − |
| SCE257 | 2/10/98 | Water, fish farm | O42 | D | − | + | + | − |
| SCE258 | 2/10/98 | Water, fish farm | O42 | D | − | + | + | − |
| SCE259 | 2/10/98 | Water, fish farm | O42 | D | − | + | + | − |
| SCE260 | 2/10/98 | Water, fish farm | O42 | ND | − | + | + | − |
| SCE261 | 2/10/98 | Water, fish farm | O42 | ND | − | + | + | − |
| SCE263 | 2/10/98 | Water, fish farm | O10 | E | − | + | + | − |
| SCE264 | 2/10/98 | Water, fish farm | O42 | C | − | + | + | − |
| SCE265 | 2/10/98 | Water, fish farm | O42 | C | − | + | + | − |
| SCE340 | 5/5/98 | Plankton, freshwater pond | O69 | H | − | + | + | − |
| SCE341 | 5/5/98 | Plankton, freshwater pond | O69 | H | − | + | + | − |
| SCE354 | 5/19/98 | Water, freshwater pond | O27 | I | + | − | + | + |
| SCE359 | 5/19/98 | Water, fish farm | O8 | J | − | + | + | − |
a
The various ribotype patterns designated A to J are shown in Fig. 3. ND, not determined.
b
The tcpA from strains SCE340 and SCE341 belonged to the El Tor variant, while tcpA from the other strains belonged to the classical variant.