Has anyone ever successfully treated chickens with CRD with sulfadimethoxine soluble powder? I got it along with some VetRX to treat my chickens. I was hoping the VetRX would do the job, but I'm hearing more wheezing in my coop and the ones who are the sickest aren't getting better. The sulf. powder package says in can be used on meat chickens, but does not say anything about egg layers. I know I'd probably have to throw away their eggs for awhile, and as painful as that is, I don't care as long as my chooks get better!! Also, would it be okay to treat the whole flock even though all of them don't "have" CRD?