Get this, I had someone come over who was/is a prominent figure in 4-h in my county to give me and my kids some advice on my flock before the show season and now my whole flock is infected with CRD. She has a lot of birds that live in her house and such was telling my husband how she has had a few sick birds die and now my kids cant show the birds. I now have to keep a closed flock. I was told to go to this girl cause she could help us, us being new to chickens and 4-h and she infected my whole flock. I am so heartbroken. I had spent alot of money on some awesome birds and coop and all the fixins. This really sucks! Why cant CRD just be vaccinated for? if it doesnt kill the birds and can be treated with an antibiotic, why are the birds culled? We humans may be" carriers" for the commen cold> i dont get it.