Need some help. I have a 6 y/o Buff Roo, who started acting lethargic and odd within the last week. At first, my husband and I attributed it to aging, but as of yesterday we noted him drooling with a long drool thread coming from his beak through the day. None of the other birds have any symptoms. He does not feel like he has lost weight, and we have not noted any worms. We isolated him last night and starting a course of duramycin. Really don't want to introduce dewormer since we have not seen worms and because of his age. This roo has been in perfect health his entire life. He has a terrible odor from the drool. So I'm thinking URI. Any other thoughts or actions I should be doing?