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on cattle that had not been vaccinated before, or failure of the vaccine to prevent IBR,” Barling ex- plained. However, the experienced veterinarian says vaccinating a pregnant animal with an MLV defi es common sense. “The bovine species is the only one among all the animal species in the world that has a label for MLV use during pregnancy,” he reported.


Barling has a simple message for cattle producers:


Don’t take the risk of using an MLV. Take the safe, effective route by vaccinating with an inactivated vaccine like Vira Shield® from Novartis Animal Health. “Inactivated vaccines pose no risk to gestat- ing fetuses,” he said. Latency is another potential risk with using MLVs.


Dr. Clinton Jones, a virologist at the University of Nebraska, explains that vaccinating with an IBR MLV has the potential to reactivate from latency during a stressful event or immune suppression. “Modifi ed-live viruses, if reactivated, are likely to


enter the blood system and cross the placenta. The IBR virus prefers actively growing tissue, which is characteristic of a developing embryo,” Jones said. He also worries that a cow vaccinated with an MLV has the ability to infect others in the herd by shed- ding the IBR virus. “The most important thing about managing IBR in


herds is that one should never vaccinate a pregnant cow with an MLV,” concluded Jones.


78 The Cattleman October 2014 thecattlemanmagazine.com


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