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There are some human drugs and vaccines that should not be used if there 
has ever been a prior reaction. Myself I would be very learly of giving 
a vaccine that caused a prior reaction. That said you need to be sure it 
was the vaccine and not the carrier a particular company uses. I had bad 
reaction in one of my horses to a Potomac Horse Fever vaccination some 
years. At the advice of my vet I will not give that one again. In this 
case given the probability of catching the PHF, the risk from the 
vaccine is higher than the risk of PHF itself.

The use of vaccines is a matter of risk management. If the risk from the 
vaccine is higher than the risk of the condition (when the probability 
of getting it is factored in ), then don't vaccinate - if the risk from 
the condition is higher, e.g. EEE or WEE, for the condition then 
vaccinate. Many horses recover just fine from WN. Very few recover from 
EEE or WEE.

Truman

Scott Johnson wrote:

> Speaking of reactions to vaccinations, has anybody ever had a horse 
> colic after vaccinating?  One of my horses did this twice, but I think 
> it may be more of a stress reaction.  It wasn't the same vaccination 
> each time either.  Happened 30-60 minutes after the shot was 
> administered.  In the 9 years I've had her, this has never happened, 
> then wham- twice last year.  Makes me leery of giving her any shot.  
> Any thoughts on this?
>
> Dede

>




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