I wasn't really concerned when one of my D'Uccles got a small cough and a little running nose. I mostly thought it was from stress after buying her. After 2 weeks I put my D'Uccles in with my Cochins and then once I got a better pen moved them into that pen. Now, I bought some new D'Uccles and had no other choice to put them in with the rest and thought nothing of it coming from a healthy flock. Well, needless to say all of my birds including my other pens now have this coughing/sneezing but the one D'Uccle is now healthy. Should I put some Duramycin-10 in all the water? My Pheasants seem healthy, nothing wrong with them. My Cochins are also healthy.