Table 3.
SNPs in CTX prophage regions
| CTX prophage | RS1 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Strain ID. | Group | rstR | rstA | rstB | cep | orfU | ace | zot | ctxA | ctxB | rstR | rstA | rstB | rstC |
| 341 | ET‐1 | rstREl Tor | − | − | − | − | − | − | − | ctxB3 | rstREl Tor | T579C, T609C, C654T, C639T, T894C | ‐ | ‐ |
| J6 | ET‐2 | rstREl Tor | − | − | − | − | − | − | − | ctxB3 | rstREl Tor | T579C, T609C, C654T, C639T, T894C | ‐ | ‐ |
| C1 | ET‐3 | rstREl Tor | − | − | − | − | − | − | − | ctxB3 | rstREl Tor | T579C, T609C, C654T, C639T, T894C | ‐ | ‐ |
| C2 | ET‐4 | rstREl Tor | − | − | − | − | − | − | ctxB3 | rstREl Tor | ‐ | ‐ | ‐ | |
| P2 | ET‐5 | rstREl Tor | − | − | − | − | − | − | − | ctxB3 | NA | NA | NA | NA |
| C7 | ET‐6 | rstREl Tor | *G301A | T84C | − | − | − | − | G622A | ctxB3 | NA | NA | NA | NA |
| P16 | ET‐7 | rstREl Tor | − | − | − | − | − | − | − | ctxB3 | NA | NA | NA | NA |
| M25 | ET‐8 | rstREl Tor | − | − | − | − | − | − | − | ctxB3 | rstREl Tor | ‐ | ‐ | ‐ |
Nucleotide sequences of CTX prophage array of each strain were compared with that of N16961, a reference strain of V. cholerae biotype El Tor.
−: no SNPs compared with the corresponding gene of N16961 are present
NA: not applicable, satellite phage RS1 was not present in the genome
rstREl Tor: ref. (23); B3: ref. (21)
*: strain C7 contains four copies of CTX phage arrays in the genome. SNPs were found in three of four CTX prophage arrays of the strain (see text for more detail).