I have 2-3 chickens at the moment that have nasal drainage, coughing and sneezing and are lethargic! We have had one die within a day of noticing that it was sick. The other chickens (about 25-30) at the moment seem to be ok, they are eating and drinking. The ones that are sick will not eat or drink and just stand around and sleep. I am using oxytetracycline in there water at the moment. Any ideas or thoughts? We did buy some new ducks and birds a couple weeks ago that didn't appear to be sick! Thanks for everyone's input in advance!