
DE wont do anything. I strongly urge you to follow Chickenzoo's recommendation. You are either dealing witth coryza or MG. Either will easily spread through your other birds. With coryza, there's a foul odor around the head area, otherwise I'd suspect MG. Here's a link, scroll down to Coryza and Mycoplasma Gallisepticum (MG) and read about them if you wish.
http://edis.ifas.ufl.edu/ps044
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