Merck Animal Health reported that beef and dairy producers now have the flexibility to vaccinate pregnant cows and calves nursing pregnant cows against bovine reproductive and respiratory diseases with its Vista modified-live viral (MLV) vaccine product line. Approved by the U.S. Department of Agriculture, the new indication includes the following label additions:
* Cows or heifers being vaccinated should be vaccinated prior to breeding, within the previous 12 months, with any of the vaccines in this product line.
* Fetal health risks associated with vaccination of a pregnant animal with MLV vaccines cannot be unequivocally determined by clinical trials conducted for licensure.
* Management strategies based on vaccination of pregnant animals with MLV vaccines should always be discussed with a veterinarian.