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All of your chickens could be at risk no matter the age if you brought vaccinated or unvaccinated chickens into your flock. The vaccine does not prevent the disease nor will it prevent vaccinated birds from carrying the disease into your flock.

Yes...they can bring the Marek's disease in to your flock even though they were vaccinated. I'd never make the mistake of accidentally bring in a disease into my flock. I actually have never added chickens to my original flock for this exact reason, but if I were to add I would add day old...