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The chicks do have some immunity for a few days from mamma, but that is it. Marek's is becoming epidemic in back yard flocks! It used to be the hatcheries in the 70's. They lost 60% to marek's. They now practice all in/all out, and the larger ones vaccinate also, so have gotten their loses down...

Once mixed, you only have an hour to use it, then it must be disposed of properly! You can NOT keep if for the next clutch! This is a live turkey strain, and is currently the only vaccine offered for the back yard chicken owners. There is much speculation if it even works anymore...no...

The vaccine is only good for ONE HOUR after you mix it. Yes you can vaccinate older birds, but there is no research to back up whether it works or not. This is a herpes virus, with quite a few strains and seems, from flocks that are now infected, mutating and getting stronger. There is much...