Personally, and Roberta and I have pm'ed about this, is that this is far more widespread than most chicken folks want to admit and that not talking about it only makes it worse. I don't think it is fair to Roberta to single her out and put it on another thread. If she wants to put it out there, and she has, she will. The Marek's vaccine only protects against the tumors that the virus causes, not against contracting the disease. It stands to reason that this means that many birds have it. It also means that if we cull only birds that show signs, it has already spread during the latent phase of the disease. Those that cull still probably have it in their flocks (this is true for most of the viral diseases in any animal) and have kept the birds that didn't show outright signs of disease. Additionally, so many people lose birds to "unknown" causes. I have lost several after going to the NJ state fair show and I am convinced that my participation (I didn't show any birds, just helped with the show) is what brought something back to my flock, despite very careful attention to my biosecurity rules. So, now what? Never bring another bird in? Cull the flock and start over? Keep the survivors and hope for the best? Never let them out of the building for fear of wild bird droppings? It is an impossible dilemma for the average backyard owner. just my 2 cents.
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