mass vaccination as a complementary tool in the control of a severe outbreak of bovine brucellosis due to brucella abortus in extremadura, spain.we report the evolution of an outbreak of bovine brucellosis (brucella abortus) in the region of extremadura (spain) involving more than 1000 herds and nearly 40,000 animals. s19 vaccination of young cattle combined with a test and slaughter strategy did not result in a rapid decrease in herd prevalence and animal incidence; these parameters showed a constant decreasing trend only when a combination of restriction of cattle movements, increased test frequency, s19 vaccination and mass rb51 vacci ...201020833439
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