I have never had a sick chicken, at least not until 2 mos. Ago when I bought 12 chicks and a thrown in young rooster. I believe the birds I bought have brought illness to my whole flock. My Leghorn roo looks like he's got the pox on his comb and also have seen it in another but it went away. All of my faithful layers stopped. A few older birds started sneezing shortly after bringing the new birds home. My laying flock freeranges and the others were kept penned seperate for a month. Shortly after mixing the new roo in and allowing him to free range as well it seems he has passed on something to the youngsters I bought. I lost one baby early on. Then another last week and one today and one yesterday. Also lost a week old creamed legbar today. All same symptoms. Weak poor coordination reduced eating drinking loss of weight runny poo looks like water with white goo. Drooped wings puffed feathers and eventually swollen eyes and death. Do I need to kill my whole flock?