TABLE 1.

Biotype characterization of V. cholerae O1 isolates from Vietnam

Strain(s)Voges-Proskauer test resultaSensitivity to polymyxin B (50 IU)brstR typectxB typeMLST typec
Vietnamese strains (n = 70)+REl TorClassical1,1,1,2,1,1,1,1,1
O395 (classical)SClassicalClassical1,1,12,2,3,1,1,6,1
N16961 (El Tor)+REl TorEl Tor1,1,1,2,1,1,1,1,1
B33 strain+RClassicalClassical1,1,1,2,1,1,1,1,1
  • 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.