Is it safe to mix vaccinated chickens with unvaccinated chickens? I have heard that it is not, that the unvaccinated chickens could catch Merak's disease.
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I have learned that the Mareks vaccine is actually the turkey version of Mareks, so technically they can't get Mareks from the vaccine. However if they are exposed to Mareks, they can become carriers and then should not be mixed with unvaccinated chicks, Mareks is very complicated and I know there is alot of controversy and confusion surrounding the vaccine. I personally lost an 8 week old chick that had been vaccinated for it.
OK so it sounds like my first, unvaccinated (very healthy) batch of chicks will be fine when they are (eventually) mixed with my second, vaccinated batch of chicks (they are a month apart in age)...