No he/she is fine. No other symptoms, and I havent heard a sneeze since I gave her a deeper one. She has now decided her water dish is a swimming hole.She sits in it splashing around. It's funny, but now I have to think of a better solution. I have all of those things here, so I will use them if I need to. They currently have ACV, brewers yeast, and drench in their water that she is playing in.Hard to say, ducks can be hard to diagnose. Do his eyes droop at all and is he having difficulty breathing? I would get some electrolytes in his water right away and also give him some nutri-drench. You can get both at the feed store.
PS - Are you feeding the same feed you feed the chicks? If it is medicated chick feed that could be the culprit. Ducks have different protein and niacin requirements than chickens and medicated chick feed can be harmful to ducks.