Congrats on the eggs. First eggs are so amazing aren't they? I am just waiting for this summer's 3 pullets to start and it surely has to be any day now!
I would probably dismantle and burn the old coop if you haven't already. If the chickens have access to it, they could and probably will go...
Chicks only need to be vaccinated at hatch for Marek's. The vaccine is however not 100% effective, but that is not to say re-administering it is worthwhile. Did you get them vaccinated because you have experienced Marek's on your property or just taking precautions to prevent it? That can make a...