My chickens have been sick for over a month. They have runny noses, they are wheezing and coughing, and it seems to be contagious throughout my flock. I have given them several antibiotics, but nothing seems to help them. It clears up a little bit, but it comes right back. It is more evident at night, you can hear it more. My neighbors chickens have been doing the same thing. I've seen runny noses on their chickens as well as heard them coughing. People from the feed store have advised me to cull them out and start new in 6 months or so because it sounds like CRD. I would like to know if anyone knows if this is in fact what could be wrong or has gone through anything similar and could give me any help with what to do. Any help is appreciated! Thank you.