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The vacination will not take if the bird has ever been exposed to Mareks. Since it's so common older vacinations are not done often. Chicks that have been naturally hatched are not even done.

Thanks for posting that. I know the confusion comes from the chicks that get sick with Mareks after being vacinated. He put that very well, it's a race with the 2 viruses to see which will get the chicken. If the vacine virus wins then the chickens will not shed, and will not be sick. If the...