I'm sure you've looked all this up, but I found this interesting. I don't know how you'd ever eradicate it (whatever it is...canker maybe?) I wonder what local/state government does when diseased creatures are found. Surely they don't just let them run around spreading contagion? Might be worth a call to FWP.Thanks Meg
I have no idea but I’m certain it’s not Marek’s. These birds are exhibiting respiratory symptoms and usually a Marek’s case will present with paralysis and/or tumors. I can’t cull just one bird and send for a necropsy because the lab isn’t doing them right now so feel like culling all and starting fresh is probably the best bet in this case. Whatever it is, the only symptoms are the rattling when they breathe that gradually gets worse, some sneezes and now the sicker birds are showing less interest in food. I almost thought maybe the roo or the rescue girls brought something into the flock but I don’t think so. The roo never exhibited any symptoms and the rescue girls weren’t the first to get sick with this thing. So I’m inclined to believe that since the pigeons were showing the same symptoms that it’s something being passed by them. They could certainly be bringing it from another flock around here as well.
https://www.thesprucepets.com/common-pigeon-diseases-4153044