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I understand your frustration and despair. There are a number of us with it in our flocks (the truly frustrating thing is that even perfect biosecurity can't keep it from coming in on the environment even!), and I don't know about the others but I take some small comfort in having a "Marek's...

If your existing flock has been exposed to your Marek's birds (RIP... sorry for your loss!) then vaccination probably would be a waste of time and money. You can still do it, if they are healthy, but in reality their immune systems are already either building resistance... or not. Vaccination...