Cows can also be vaccinated, using two subcutaneous injections 2-4 weeks apart. The course should finish 4 weeks prior to breeding. Vaccine is safe in pregnant cattle and can be used after exposure to reduce shedding. | Cows can also be vaccinated, using two subcutaneous injections 2-4 weeks apart. The course should finish 4 weeks prior to breeding. Vaccine is safe in pregnant cattle and can be used after exposure to reduce shedding. |