Hi - I'm currently treating my 23 week old chicken with Tylan 50 (injected in the back of her neck) because I believe she had Corzya (bubbly eye, nasal discharge and she smelled TERRIBLE) She's had 3 injections of 1/2 cc so far. her eyes aren't AS bubbly, but still are a tad. She doesn't smell bad anymore. She's active, eating and drinking. (She's been inside since starting the injections). My question is, how long should I keep injecting her? When she first had these symptoms, I treated her with tetracycline powder (duramycin?) for a week. She was better and I released her, only to have her get "sick" again, just as bad, a week later. I'm afraid that she'll come right back down with it if I don't treat it long enough... Thanks a bunch!!