Table 3.

Selected characteristics of V. cholerae O1, O139, and non-O1, non-O139 strains included in this study

StrainHemolysis Presence of the following genes as determined by PCR NCT productionb
V. cholerae O1 biotype E1 Tor  strains
 VO2Beta ++++++++NT
 VO13Beta ++++++++NT
 VO3None +++++++NT
V. cholerae O139 strains
V. cholerae non-O1, non-O139  strains
  • a Specific for V. choleraeclassical hlyA. All V. cholerae strains were positive for nonclassical specific hlyA.

  • b NCT, new cholera toxin detected by immunodiffusion assay.

  • c NT, not tested.

  • d Reference strain MO45 (= ATCC 51394).