I bought a 3 week old polish tophat chick a few weeks ago along with some other chicks. After a couple days of having her I noticed her sneezing every once in a while. The following day the sneezing was worse. I researched what might be causing this and thought it was possibly the start of a respiratory infection. Since she is one of 5 chicks I put Termycin in their water for a week hoping to treat them all in case she was contagious. She seemed to get a little better with the Termycin, but the sneeze never totally went away. This week I came home and noticed the sneezing was very frequent and she had bubbles in her eye. I seperated her from the others and ran to the store and got Tylen 50 and injected .25 cc under her skin. She doesn't seem to have gotten any better and I am having to feed her with a syringe. The other chicks seem to be perfectly fine even after being in the same coop with her for almost three weeks. What else can I do and could this possibly be something other than a respiratory infection?