I have 5 silkies between the ages of 6-8 weeks old. three days ago one started with having trouble breathing, separated her and went to TS for duramycin started her and the rest of them on it. Today one of my smallest silkies has very raspy breathing, she has been on meds since sunday. What else can I do? Should I just keep all the silkies together? Please help, I am new with having chickens and this is so heart breaking. I did see corid at TS but it was labeled for cattle. Should I change meds?