It started with 10 weekold chicks. I hae treated one with antibiotics and the other teo pulled through ontheir own. Now some of my 6 month old leghorns aren't doing well. They are lethargic and one has a purple looking comb. They don't have diarrhea but I was getting 7 eggs a day and now I am down to 3 a day. It hasnt been too hot the last few days but has been very wet 12 inches of rain yesterday. None of them seem to have an upper respiratory infection. We got some adult chickens a few weeks ago but they have been separate. They were close to the chicks that originally got sick. My boyfriend did let the chicks out with the leghorns right before they got sick. The chicks are doing better now but I don't know what has caused this. Originally I thought it might have been te new food I gave the chicks but my leghorns haven't had any of that food. I have checked them for lice and mites. The new chickens I got had lice but we dusted them. One of the new chickens we got died yesterday but never acted sick at all. I don't know what to do for them. I have added electrolytes to their water. The chicks were treated with Albon and flagyl, do I need to do this for the leghorns? I also got some amprolium but havent used it because the chicks were doing better. Please help!!!!! And what could this be? I have not seen lice on anyone else and I know it doesn't live well once off of the chickens so they shouldn't be traveling to the other pens. Their diarrhea is white to greenish and is mucousy. When I checked a stool sample there was no coccidia just a lot of bacteria. Not sure if hat is normal for chicken poop I usually look at cat and dog poop at work and know it isn't normal for them.