Hello, This may be a long one but please help and i'll try to describe everything in as much detail as i can. I have adult chickens in a coop and run and have around 12 chicks in a brooder. 8 of the chicks were hatched by myself and my friend and have been nothing but healthy. 4 of the chicks were bought from a poultry farm that is run by a friend we were introduced to. 2 were chocolate orpingtons, that were hatched and raised by their mother and have been really healthy. The other 2 were contained with older unrelated birds, but still all youngsters in one pen. When we visited the owner of the farm treated a young frizzle whos eyes were tightly closed shut with a thick mucus type substance, which she said had a cold.and it recovered with no problems. I had 2 chicks from the same pen, and had no visable problems. I have had them for around 4-5 days and yesterday out of the blue noticed the one had both eyes shut with the same mucussy type stuff, remembering how she washed the frizzles eyes we decided to do the same, except this one had her mouth wide open. I just thought because she couldnt see she was just thirsty and hungry and when encouraged to drink did so. but wasnt too bothered about eating. The other chick had only 1 eye that had the same problem, the other eye was healthy and was much more lively and acted like a normal chick. I isolated them from the rest of the chicks and left them to recover over night Today i woke up and theres blood in the poo - not sure which one though - but now they are both lethargic and seems like theyre struggling to breath. I called the lady who owns the farm who sent up some anti biotics and i forced them to drink it and left them for a while. Th one who seemed really poorly had what looked like a seed or something stuck on the roof of its mouth near the throat, they have been fed nothing but chick crumb. the face was now swelling up, and to me look like brusing over the eyes because of how swollen its face was, it wouldnt eat or drink as its throat was swelling up, the chick that seemed healthier than the other sat there made a few weird noises like a death rattle, obviously couldnt breath and had a mad fit around the brooder box before eventually laying on its back to die. The one who was worse off lay head down breathing only every few seconds until that too died. I havent had any problems before i dont know whether it is this "cold" or if it is coccidosis, i dont know what to do but never heard of a chicken having blood in their poop, eyes swollen shut with mucus face swelling and having what seemed to be lesions in its mouth and throat, PLEASE HELP! i dont want this spreading to my other chicks or chickens!!!