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Survival of animals after the viral and bacterial challenges. A — BVD and CNTL: Animals challenged with BVDV type 1 and M. bovis or M. bovis alone respectively. BHV: Animals challenged with BHV-1 and M. bovis. B — IT and IN: Animals challenged by the intratracheal or intranasal route, respectively. The groups with different superscripts are significantly different from each other.
