That's probably the cause. I have something going around in my flock, and will definitely use your advise Sweetened. I really prefer using natural remedies since my family and me eat our birds eggs.
Ok that should be okay just make sure you don't bring any waterers or feeders into the other coop from the infected birds coop.
Praying all goes well. (By the way: I like your siggy. )
I hate to be the bearer of bad news, but if it is Coryza, really you cannot make them well. Once they recover they will be carriers for life and will pass the disease on the other birds including wild ones. I had this same issue. My whole brooder was "filled" with great quality chicks that I...