Most vaccine labels read, “For the vaccination of healthy horses . . .” Not all horses that seem well are healthy enough to mount immune responses. Stress, chronic lameness, age and poor nutrition can impact immunity. Madalyn Ward, DVM, shares steps horse owners can take to help their horse experience the best response to vaccinations with the fewest negative reactions.
Ultimately, the protection from disease must come from a horse’s response to the vaccine, not the vaccine itself.” – Madalyn Ward, DVM
Source: Equine Wellness. Link.