Jen -Chickenzoo, I never knew you have dealt with this as well! I hope things have been okay now.. It's interesting to hear what you've experienced. I've had known problems for a year. Leadwolf and I both have gone to heck and back with this. We've both been obsessive about knowing everything there is to know. Which is IMpossible with this disease. But you both have said something I've been wondering about; giving Marek's vaccine to older birds. The vaccine is supposed to be given to day olds so that they can build their "army" before the "enemy" arrives. The vaccine protects only against the tumors that kill the bird.
However, giving vaccine to older birds, I wonder if that could be more of an irritant to a bird who has already been exposed and carries it, and maybe "wake" the virus up?
Or maybe the vaccine does nothing at all for exposed adults , and eventually some get sick anyway.
This Marek's stuff is all so confusing because there's no test for it. Then there's Classic symptoms, Common symptoms, Acute symptoms, Long term symptoms, Uncategorized symptoms, Rare symptoms, Unheard of symptoms, it can be any symptoms- OR no symptoms at all. Any paralysis or No paralysis. Or paralysis that clears up fine. It affects some birds and not others and no one knows why. It makes me crazy!