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- W2080561462 abstract "Bovine tuberculosis costs New Zealand more than $80 million per year, mostly because extensive areas of the country are occupied by brushtail possums infected with Mycobacterium bovis. AgResearch has a major programme to produce new live tuberculosis vaccines that can be delivered to possums. Primary work involved development of molecular biological methods to enable genetic manipulation of M. bovis, including the production of random and specific mutants. Many avirulent mutants of M. bovis have been produced and their vaccine efficacy has been compared to BCG in guinea pigs. Selected mutants that perform at least as well as BCG are retested in guinea pigs using an extended vaccination protocol in which animals are pre-sensitized to environmental mycobacteria to mimic natural exposure. Ten candidate vaccines that have induced good protection in guinea pigs have been subsequently tested as vaccines in possums. While the protective efficacy of an M. bovis mutant inoculated into guinea pigs reliably indicated that some protection would be induced in possums, the most protective mutant in guinea pigs was different from that in possums. This illustrates the importance of testing in the target species as part of new vaccine development. An important outcome of this work was the identification of an operon in M. bovis whose inactivation produced an avirulent M. bovis vaccine candidate that was better than BCG in protecting possums from experimental tuberculosis. Allelic exchange methods are now being used to produce vaccine strains with multiple specific mutations to improve safety and immunological characteristics." @default.
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- W2080561462 date "2011-07-01" @default.
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- W2080561462 title "Newly attenuated Mycobacterium bovis mutants as vaccines against bovine tuberculosis, particularly for possums" @default.
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- W2080561462 doi "https://doi.org/10.1016/j.vetmic.2011.02.031" @default.
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