I need help
I currently have 19 hens and 1 rooster. I have 1 currently that can not walk. It started with 1 leg, 2 days ago, I pulled from the flock and isolated her. Now she seems to not be able to use either leg. My first thought was Mareks just from what I read. But here is where I am confused. I lost 3 last year from the same thing, only 3, I sprayed the coop down with some natural disinfectant safe with live birds and prepared myself to slowly lose my flock, since from what I read Marek's will wipe a flock, winter ended and I lost no more.
Now winter has started and the temps have just started getting cold and now the first one is down. Mind you it has yet to drop below freezing but does get to the 30-40's most nights with rain every 3-4 days so the yard is usually wet. My birds free range 90% of the time.
If Marek's why did I not lose and more till now and what can I do do prevent more chickens from dying? and If not Mareks what else could this be?
any help would be very helpful.
Oh and I have inspected her legs and feet for sores and they look good as well as her in general, till she started not using the leg she was very active and looked great!