I ave an older hen who started suffering from sour crop several months ago. I treated with Nystatin. It cleared up only to return in a few weeks. I tried withholding food for 24 hours, isolation and a special diet. It cleared up only to return again a few weeks later. The hen has not laid for some time due to age and I am wondering if I want to continue this cycle. Can it be passed to my other chickens? Is the chicken suffering without treatment? It has definitely lost weight. Is it time to euthanize?