I've raised chickens for 7 years and between coccidiosis and respiratory issues I thought I had seen it all; apparently not! I purchased 8 hens from a local with old hens he was looking to get off of his hands. I've had these hens for about 5 months without any issue, yet I just noticed today this issue in one of the hens. Her abdomen is very red and swollen - it feels full of fluid like a water balloon. There is puss coming form her vent, and it smells awful! She hasn't been with the other chickens all day, and instead has stayed around the house. Other than staying from the others she behaves perfectly normal. I'll go out on a limb and assume this is an infection cause by some form of impaction (probably in the egg canal). I have a few questions that I could really use some help on. Side note: I don't know if this has anything to do with it, but I did find a small egg with only egg whites in it a couple of days ago. Is my diagnosis correct? Have you treated this before? Is there anything I can do to help this hen? How likely is it that her infection is caused by a contagious bacterium? (Should I isolate her?) There are a few picture below; fair warning, they're not pleasant to look at. It breaks my heart to see her like this, she is a very sweet and great hen.