Elizabeth Davis, DVM, explains how vaccines prime the immune system and why some horses might still get sick.
The idea of vaccination is intended to provide, in a very safe way and at a small level of exposure to the immune system, so that on future exposure to the immune system at the time of disease challenge, that the horse is is protected.
Source: The Horse, October 22, 2019. Link. Although this is the mechanism to prime the immune system and have it prepared, it is not a perfect system. We need to think about giving the vaccine when the horse is as healthy as possible.
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