that is why I am going to keep searching until I can find a vet that will do a blood draw on my last sex-link to find out once and for all if I have Marek's in my flock or not. I wish I could have afforded to send my little Gravy to the university for a necropsy since I was actually right there with her when she passed but the timing could not have been worse since we had workers showing up the very next day to put on the new roof and replace windows and that drained us until the loggers come.