Search results for query: *

The only source that actually claims that is the case is Wikipedia (which can be edited by anyone). All other sources say that it may be the case, as there is no proof that the Marek's vaccine led to the more virulent strain(s). It's an interesting argument though. They need to do a lot of...

Marek's vaccine doesn't make your bird a carrier. They can become one if they get Marek's disease (instead of dying), but they aren't automatically a carrier. To me, if it's a bird you plan on keeping for their entire life, you should get them vaccinated, because if you don't and Marek's ends...