Please Help!! My two cochin hens that I have been treating with Tylan 50 are still sick. They act fine but they have runny noses and sneezing. What can I do now? I gave them Tylan 50 down their throats for 4 days..nothing happened. So I started injecting it on Sunday. So that is injections on Sun, Mon, and Tues. They are still sick though. How long can I give them the injections?? They are seperated from the flock but this morning I heard a couple of the healthy hens sneezing. This is disappointing as I treated them with the Tylan 50 down the throat when I did the sick chickens, so they shouldn't have anything. I am at a loss. I am so frustrated!!! I really need to get them back with the flock ASAP, but I don't want to make everyone sick!!