Ridecamp: Re: [RC] More on the WNV horses that were vaccinated

> I would guess that if the horses you wrote about were only vaccinated in
> September, that's why they still got sick.   jeri

The vaccine only has an efficacy rate of about 70%--which means that 30% of
vaccinated horses still have the potential to get sick, if they are exposed.
However, as with a great many other vaccines, those vaccinated individuals
who DO get sick tend to get much more mild cases, so the vaccine is still of
benefit to them.

Heidi


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