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I believe if you do not have Mareks in your flock already (which as Deb said it is very common) you can still hatch eggs from your new birds - even if they do carry Mareks. It does not transmit through the egg. If you have a "sacrificial" chicken you can put it in with the quarantined birds - and see if it gets sick from what they carry - or if they get sick from what you already have in your environment.
I also wonder about vaccinating the young chicks. I have been reading that if you vaccinate you have to keep them away from any exposure to Mareks for 7 days as they will get it worse than they would from exposure without vaccinating.... Since they are now saying the chicks are exposed at birth (if present) - it seems odd to vaccinate unless you do it 7 days before they hatch
and how do you do that?
I have also been reading that broody raised chicks are exposed to all the immunities carried by their mother in the first few days - by being exposed to her broody poop. They always get it on them somewhere - and eating it to clean it off gives them the same immunities that the mother carries. Its why most broody raised babies do not get sick. Hmm.. I wonder if the broodies would mind if I collected it and brought it into the brooder
I do hear that the turkeys carry a modified strain of Mareks that gives chickens exposed to them a natural immunity to Chicken Mareks. Perhaps if your birds carry that immunity your sacrificial chicken will pass that immunity on to them?
and
too.