I have a rooster and hen that have coryza...I am currently treating them and for now they are isolated from my hen and duck. If they get better ( I know they will forever be carriers) can they go back in with the other birds that as of now are not displaying symptoms? I don't mind keeping a closed flock just to allow them to live out their lives but wonder if when I do put them back, will the non symptomatic birds ie..my hen and duck come down with the illness? I would love to keep everyone even if it's just as carrier pets as long as they can live a happy life. I want to also mention that the 2 sick birds up til I saw discharge and smelly faces, were in with the other 2 so should I just let everyone back together considering they probably already were exposed??