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Then I highly doubt they had Marek’s. Chicks from large hatcheries like Meyer are completely isolated from other birds except for the other ones they hatch with. The Marek’s vaccine does not give chickens Marek’s, but it also doesn’t prevent them from later getting the disease and spreading it. Unfortunately, your flock probably already carried it and the stress of the new chicks brought it to the surface.I got the vaccinated chicks as day old chicks from Meyer hatchery online. I won’t rehome anyone.