@Sylvester017 ..it's Egg Yolk Peritonitis
@Bogtown Chick and @Speckled Hen was the EYP confirmed by necrospy?
Any specific thread that shows what it looks like inside after death?
Is it related to and/or caused by internal laying?
For specific details I did a search on the internet and there is more info than anyone could ever need to know, including outward symptoms which are similar to so many other chicken maladies that only a necropsy could diagnose for certain. Apparently EYP can be contagious from what I could understand in my research. I suppose just about anything viral or bacterial can be infectious in a flock. And that one problem can incite a secondary problem with different symptoms. Poor chickens -- they have so much going against them healthwise!