My flock has came down w coryza i believe. They smell like roadkill, sneezing, and runny noses. Today is the third day of antibiotics. The red sex links went downhill fast but not to the point of swollen faces. The road islands started sneezing yesterday. As of now they no longer smell and the runny noses are gone. How long should i keep injecting the antibiotics? Im only giving 1/2 CC each once a day. I think i may have brought the virus from the county fair we had a couple of weeks ago.