I'm sorry to say that three pullets of mine came down with respiratory illness symptoms, killing two of the three. Gaping, respiratory difficulties, congested, sneezing. I was able to start two of them on Tylan. I was too late with one, but the third pullet seems to be getting slowly better, starting to drink and modestly peck a bite or two. Do I continue the Tylan? She has had three doses thus far, or could it be viral? Additionally, I need to know how to reintegrate her back to the flock without risk. Or now that she has had it, is she destined to become a leper and never reintegrate back to the flock.