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
ctxAzotacesthlyAatcpAompUtcpItoxR
V. cholerae O1 biotype E1 Tor  strains
 VO1Beta+++++NTc
 VO2Beta ++++++++NT
 VO13Beta ++++++++NT
 VO3None +++++++NT
 VO4Beta++++++++NT
 VO5None++++++++NT
 VO7Beta++++++++NT
V. cholerae O139 strains
 MO45dBeta++++++++NT
 CO594None++++++++NT
 CO766Beta++++++++NT
 CO788Beta+++++NT
 VO12Beta++++++++NT
 VO14Beta++++++++NT
 VO15Beta++++++++NT
 VO16Beta++++++++NT
 VO17None++++++++NT
 VO18Beta++++++++NT
 VO19Beta++++++++NT
 VO20Beta++++++++NT
V. cholerae non-O1, non-O139  strains
 VO22Beta++
 VO23Beta++
 VO24Beta+++
 VO25Beta+++
 VO26Beta++++
 VO27Beta+++
 VO28Beta++
  • 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).