yes, but if flocks free range aren"t they exposed to wild bird dander and poo every day?Mareks can be transmitted by mosquito but is more readily transmitted by dander and poop of wild birds. The vaccine is actual a strain derived from turkey mareks which doesn't harm chickens but according to the pathologist it seems that most strains are mutating rendering vaccination less effective. She did stress that good husbandry and cleanliness was the best tool against mareks though.
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