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Canine adenovirus based rabies vaccines.

Adenovirus based vectors are very attractive candidates for vaccination purposes as they induce in mammalian hosts potent humoral, mucosal and cellular immune responses to antigens encoded by the inserted genes. We have generated E1-deleted and replication-competent recombinant canine type-2 adenoviruses expressing the rabies virus glycoprotein (G). The effectiveness of both vectors to express a native G protein has been characterized in vitro in permissive cell lines. We compared the humoral and cellular immune responses induced in mice by intramuscular injection of the recombinant canine adenovirus vectors with those induced by a human (Ad5) E1-deleted virus expressing the same rabies G protein. Humoral responses specific to the adenoviruses or the rabies glycoprotein antigens were studied. The influence of the mouse strain was observed using replication-competent canine adenovirus. A high level of rabies neutralizing antibody was observed upon i.m. inoculation, and 100% of mice survived lethal challenge. These results are very promising in the perspective of oral vaccine for dog rabies control.