Yeah sorry it's been crazy round here with the little ones being sick.
So the necropsy on the cockerel came back as Mareks. There was lymphoma in the blood and advanced lesions on organs. He also had very high amounts of coccidodosis in the stool. So sadly they say that he was shipped with these issues as he was only in my care for 3 days before he was euthanized and also completely quarantined away from any other birds. The others are potential carriers so I can't put them anywhere near my other flocks as they've never had any symptoms of Mareks. Luckily we have enough land and resource to have them in an area that's no where near our current birds. We are just going to keep practicing vigilant biosecurity and raise them to laying age. We'll hatch out as many chicks as we possibly can and fill any egg orders.
Interestingly I've spent a GREAT deal of time on the phone with avian vets and pathologists and they've all said that most flocks in the US, especially those that have outdoor/freerange yards are carriers of Mareks. It was a ridiculous percentage that they suspect. But she said that it's a non-issue if you keep your birds in good health. Things like cocci and stress of travel can make birds shed the viruses. she said that the respiratory issue wasn't anything contagious but was a complication of the other issues in his system. She said that MG is much more of a concern as it passes through the embryo. She said once a flock has it it's near impossible to eradicate. So THANKFULLY it wasn't MG! Even with the strictest biosecurity I would have had all of my flocks!