Table 1.
Abundance of chxA (cholix toxin) gene among Vibrio cholerae strains used in this study
| Serogroup | Country | Source | No. of strains | Presence or absencea of chxA |
|---|---|---|---|---|
| O1 (n = 485) | India | Clinical | 260 | − |
| India | Environmental | 208 | − | |
| Brazil | Clinical | 10 | − | |
| Bangladesh | Clinical | 4 | − | |
| Peru | Clinical | 3 | − | |
| O139 (n = 84) | India | Clinical | 61 | − |
| Bangladesh | Clinical | 23 | − | |
| Non-O1/non-O139 (n = 196) | India | Clinical | 64 | − |
| India | Clinical | 18 | + | |
| India | Environmental | 79 | − | |
| India | Environmental | 35 | + | |
| Total | 765 | 53 |
a
−, absence; +, presence.