TABLE 1.
Biotype characterization of V. cholerae O1 isolates from Vietnam
| Strain(s) | Voges-Proskauer test resulta | Sensitivity to polymyxin B (50 IU)b | rstR type | ctxB type | MLST typec |
|---|---|---|---|---|---|
| Vietnamese strains (n = 70) | + | R | El Tor | Classical | 1,1,1,2,1,1,1,1,1 |
| O395 (classical) | − | S | Classical | Classical | 1,1,12,2,3,1,1,6,1 |
| N16961 (El Tor) | + | R | El Tor | El Tor | 1,1,1,2,1,1,1,1,1 |
| B33 strain | + | R | Classical | Classical | 1,1,1,2,1,1,1,1,1 |
a
+, positive; −, negative.
b
R and S indicate resistance and sensitivity, respectively.
c
MLST loci in the order dnaE, lap, rstA, gmd, recA, pgm, gry, chi, and cat.