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In my opinion I would not vaccinate for Marek's. Because out of sight is out of mind... even vaccinated they can still pass it on through the dander. Once you have Marek's on your property you have it for ever because it cannot be cleaned away.
So I would rather KNow and deal with it... Like @seminolewind is doing. That way I cant inadvertently pass it on to someone else's flock.
For what its worth they vaccinate with The turkey version of Marek's... It seems Turkeys do get a version of it but dont get sick... And it seems Guineas dont get it at all.
Oh and for what its worth the vaccine was developed for the poultry industry... eggs and meat... Can you imagine the devistation of a farmer trying to make a living and having all his birds come down with it. And from then on he couldnt raise chickens at all. With the vaccine he could keep going.
I would NOT adopt a battery hen for that reason...
deb
It did happen. In the late 70's/early 80's, Marek's got so bad with commercial poultry that 2/3 of flocks were wiped out. The vaccines started use. But the commercial poultry growers were still having a lot of deaths-until they learned that aside from the vaccine, you should practice all in-all out with flocks, disinfect well between batches.
Then up until about 5-10 years ago, everyone thought it was a poultry industry problem and backyarders don't have to worry. Well as the poultry industry got their deaths down to 1-5%, backyarders were getting Marek's because they had mixed flocks, swaps, auctions, breeders, and vets were telling people their chickens wouldn't get Marek's-it's an industry problem.
Making a few changes, you can live with Marek's, sell hatching eggs, breed and sell chicks if incubated elsewhere and not at your home. It's do-able.