The oral bivalent cholera vaccine WC-O1/O139/CTB and the
monovalent WC-O1/CTB cholera vaccine (Dukoral) were studied
(SBL Vaccine, Stockholm, Sweden). The WC-O1/CTB monovalent
cholera vaccine studied is a licensed vaccine, which contains
1.0×1011 heat- and formalin-killed O1 vibrios (both Inaba and
Ogawa serotypes, and classical and El Tor biotypes) [8] together
with 1.0mg of recombinantly produced cholera toxin B subunit. The
bivalent vaccine in addition to the 1.0×1011 ofWC-O1/CTB vaccine,
contains 5.0×1010 formalin killed V. cholerae O139 (strain 4260B)