Oral immunization with Salmonella typhi Ty21a-based clones expressing Vibrio cholerae O-antigen: serum bactericidal antibody responses in man in relation to pre-immunization antibody levels
- 31 December 1991
- Vol. 9 (12) , 877-882
- https://doi.org/10.1016/0264-410x(91)90007-s
Abstract
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