I had a partridge rock that recently past. She was only 6 months old. We live in Northern NewEngland. I have 13 hens. They have a 8x12 coop with a caged 10x16 run. They also free ranged before the snow came. She first showed signs about two weeks ago. I noticed her wings drooping. Then she started to isolate herself from the flock. Started to "hunch up" and neck feathers raised. Her comb became very pale and seened to shrink. I watched he eat and drink. After a week She started to not roost at night then things went down hill. Her vent was very messy. There was no blood in the poop. She past away this sunday. A friend mentioned coccidiosis. I had the birds vaccinated when i bought them thru mail order. I bought corid 9.6 % to treat her on saturday. Since she pasted, i was curious abouttreating the other hens. None of them show any signs of illness. Any thoughts?