TABLE 2.
Presence of different virulence-associated genes among O139 V. cholerae isolates used in this study
| No. of isolates | Presence of genea |
|||||
|---|---|---|---|---|---|---|
| CTX prophage |
tcpA | rtxC | VSP-I | VSP-II | ||
| rstR | ctxB | |||||
| 83 | E | E | E | + | + | + |
| 3 | − | − | − | + | − | − |
| 2 | E + C | E | E | + | + | + |
| 1 | rstR6 | E | E | + | + | + |
| 1 | E | E | E | − | + | + |
| 1 | E | E | E | + | − | + |
| 1 | − | − | E | + | + | + |
| Environmental | ||||||
| 64 | − | − | − | + | − | − |
| 42 | E | E | E | + | + | + |
| 3 | E | − | − | + | − | − |
| 3 | − | − | − | − | − | − |
| 2 | E | E | E | − | + | + |
| 1 | E + C | − | E | + | − | +b |
| 1 | E | E | E | − | − | + |
| 1 | E | E | E | + | − | − |
| 1 | E | E | − | + | + | + |
| 1 | − | − | E | + | − | − |
a
+, positive; −, negative; C, classical; E, El Tor.
b
Positive for six ORFs (VC0490, VC0493, VC0498, VC0502, VC0512, and VC0516) in VSP-II.