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The vaccine has to be given at 24 hours old, it can't be given to adult birds or to birds that have already been exposed to the virus. If you vaccinate the chicks, they couldn't be given back to the hen for 2 weeks, to prevent exposure before the vaccine had a chance to take, and at that point...

If you lose another I would recommend that you have a professional necropsy done, so you can verify or rule out Marek's disease. IF it's Marek's then the virus is on your property. It's spread mostly by feather dander and dust, it's everywhere. It can spread on the wind for miles. It can...