I have a chicken who seems to have something wrong with her. She is doing this weird cough/sneeze thing and has watery poop. No runny eyes or nose, no bloody stools, and not even acting sick. Just the cough and the watery poop. She's been doing this for several weeks. She in with 20 other chickens and no one else is presenting with symptoms. Anybody have any suggestions? Should I try antibiotics? Any help would be appreciated. Thank you.