VIBRIO CHOLERAE 01 (CVD111) and -Non-01 (CVD112 and CVD112RM) serogroup vaccine strains, methods of making them, and products thereof

摘要

Avirulent Vibrio cholerae strains of 01 (CVD111) and non-01 (CVD112 and CVD112RM) serogroups having the DNA of the cholera toxin core and the RS1 sequences of the cholera toxin locus deleted, and further having a DNA encoding a resistance to mercury, and a DNA encoding the cholera toxin B subunit, or a part thereof sufficient to confer immunogenicity, re-inserted in the chromosome. Methods of making the avirulent V. cholerae 01 and non-01 strains of the invention, and cholera vaccines using these strains.