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[Community trial for safety and immunogenicity of oral-administered lyophilized rBS-WC cholera vaccine].

In order to evaluate the safety and immunogenicity of domestic produced lyophilized recombinant, B-subunit, inactivated whole cell vaccine of vibrio cholerae (rBS-WC), 369 subjects were randomly divided into three groups and observed with masking method, one with high dose of vaccine (5 mg rBS and 10" WC), another with low dose (1 mg rBS and 10" WC), and the control one with placebo. Three doses of vaccine were given orally at an interval of seven days and 14 days, respectively. Results showed that only one subject had mild adverse reaction in the vaccine group (1/247) and none in the control group. Serum and fecal antibody conversion rates and average levels of antibodies in the two vaccine groups were significantly higher than those in control one. There was no significant difference in serum and fecal antibody conversion rate and average antibody levels between the two vaccine groups. But, antibody response was different among subjects of various sex, age, and vaccine doses. It indicates that rBS-WC vaccine of vibrio cholerae had good immunogenicity and safety.