I'd also like to point out that a friend of mine went to a poultry show in CT and there were some big bame Silkie breeders there. She purchased a Silkie rooster who was acting very lathargic by the next day. By three days he couldn't open his eyes. Took it too the vet and he had MG. This is from a well known breeder and she had no idea. I breed my birds to be hardy and resistant and only sell as pets, not to breeders or people who wanna heavily show. It's all around and if you even attend a show you very well can bring it home to your flock. I have 4 year old birds who never show symptoms. The strong will live and be resistant and the weak perish. I don't mind people wanting to keep it out of their flock but in the mountains of NY, I have wild birds left and right sharing the pasture with my birds. If I were to cull my flock and start over, it would come right back cause of the wildlife. It's in nature for a reason to keep the strongest alive so I will let it do that.....plus I love my birds and don't wanna kill them, lol. Good luck in whatever you choose.