OMG, I can not believe I have Mareck's in my Tolbunt Polish and Cream Legbar juvies. My paperwork states they were vaccinated. Is it possible for birds that are vaccinated against Mareck's to get Marecks? Do I have to put the whole flock down now? I'm at a total loss here. They have the typical symptoms: difficulty breathing, gray eye color, stumbling when walking. Someone help.