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. 1997 Jun;65(6):2029–2033. doi: 10.1128/iai.65.6.2029-2033.1997

A recombinant Bacillus anthracis strain producing the Clostridium perfringens Ib component induces protection against iota toxins.

J C Sirard 1, M Weber 1, E Duflot 1, M R Popoff 1, M Mock 1
PMCID: PMC175280  PMID: 9169728

Abstract

The Bacillus anthracis toxinogenic Sterne strain is currently used as a live veterinary vaccine against anthrax. The capacity of a toxin-deficient derivative strain to produce a heterologous antigen by using the strong inducible promoter of the B. anthracis pag gene was investigated. The expression of the foreign gene ibp, encoding the Ib component of iota toxin from Clostridium perfringens, was analyzed. A pag-ibp fusion was introduced by allelic exchange into a toxin-deficient Sterne strain, thereby replacing the wild-type pag gene. This recombinant strain, called BAIB, was stable and secreted large quantities of Ib protein in induced culture conditions. Mice given injections of live BAIB spores developed an antibody response specific to the Ib protein. The pag-ibp fusion was therefore functional both in vitro and in vivo. Moreover, the immunized animals were protected against a challenge with C. perfringens iota toxin or with the homologous Clostridium spiroforme toxin. The protective immunity was mediated by neutralizing antibodies. In conclusion, B. anthracis is promising for the development of live veterinary vaccines.

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Selected References

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