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Of course they "can". A piece of space junk "can" fall out of the sky and hit your house. You "can" have an accident the next time you drive to the grocery store. It "can" rain today. The question is "will" they get sick from Marek's. Nobody knows. If they are exposed to the Marek's...

I should have added to my last post, many chickens that are not vaccinated that catch Marek's will never show symptoms but they can still spread Marek's.

The Marek's vaccination does not stop the bird from catching Marek's. The vaccination stops it from developing the tumors that cause the damage. The vaccination does not cause the bird to be a carrier. If a vaccinated chicken is exposed to chicken Marek's it can catch Marek's. It can pass...