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process for the preparation of a mutant strain of bordetella bronchiseptica improved useful for a vaccine, attenuated live for the protection from infections of b.bronchiseptica vaccine ar attenuated live so obtained
process for the preparation of a mutant strain of bordetella bronchiseptica improved useful for a vaccine, attenuated live for the protection from infections of b.bronchiseptica vaccine ar attenuated live so obtained
