One of my red star hens, Hazelnut, about 1 year old, was euthanized at the vet today. Starting yesterday, she became extremely lethargic and listless and stood separate from the flock. She didn’t go home to her chicken tractor last night and I had to put her in myself. Today she was worse. She stood in a corner of the tractor by herself hunched over and with ruffled feathers. I checked for egg binding, nothing, checked for lice and mites, nothing. Her crop wasn’t impacted and her comb looked fine. I brought her inside and syringe fed her water since she wasn’t interested in drinking it or eating scrambled egg on her own. She had really runny poops too. When I put her in the pen I made for her she wouldn’t stand on her own so that’s when I decided to take her to the vet. At this point, I’m texting 3 different people trying to get advice and I’m getting 3 different answers. One persons saying worms, ones saying she’s probably egg bound (though I checked for that), ones saying coccidiosis. I took her to the emergency exotic vet and they looked at her and told me they wanted to do bloodwork and X-rays and hospitalize her to the tune of $1000. I love my chickens and so does my mom but my mom wasn’t paying for that and I don’t have that kind of money. Without the testing, they didn’t know exactly what was wrong with her but the vet suspected something neurological bc apparently (I hadn’t noticed this) she was leaning to one side and only opening one eye. And of course it could be an infectious disease. We decided to have her humanely euthanized, sadly. I’m left with a dead chicken and no answers. Should I be concerned about the rest of my flock? How can I protect them? If it is coccidiosis what can I do to treat it? Thank you in advance for reading and answering.