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  • Title: Immunogenicity of liposome-associated and refined antigen oral cholera vaccines in Thai volunteers.
    Author: Chaicumpa W, Chongsa-nguan M, Kalambaheti T, Wilairatana P, Srimanote P, Makakunkijcharoen Y, Looareesuwan S, Sakolvaree Y.
    Journal: Vaccine; 1998 Apr; 16(7):678-84. PubMed ID: 9562686.
    Abstract:
    A mixture of Vibrio cholerae antigens made up of crude fimbrial extract, lipopolysaccharide and procholeragenoid was administered orally to Thai volunteers either as free antigen or associated with liposomes. All vaccines and controls were administered in three doses given at 14 day intervals. Nine volunteers received liposome-associated vaccine and seven received free vaccine. Liposomes without antigens were given to eight volunteers and seven volunteers received 5% NaHCO3 solution alone. Both vaccines had 100% immunogenicity as determined by serum vibriocidal antibody responses. Liposomes were shown by indirect ELISA to localize the immune response against lipopolysaccharide and fimbriae to the intestinal mucosa. Vaccines given liposome-associated antigens had a higher rate of antigen-specific antibody response than did individuals who had received free antigens. The vaccines induced intestinal antibodies of IgM and/or IgA isotypes, but not IgG antibody.
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