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No, it's not a venereal disease at all. It can even spread through feather dust, so it's easy for it to spread even from wild birds to domestic flocks. Look it up on Google (specifically in birds, birds have slightly different symptoms than people do), there's some good information on it there. I'm hoping this isn't what he has because of the hassle of it, but it's worth looking into.
Aw, too bad about the vets... Keep looking through the internet about duck diseases, hopefully you'll figure out what he has.
By the way, my duck had these symptoms: Eye discharge, wheezing, some coughing, weakness to the point of being unable to stand or lift his head eventually, extreme amount of urates in his poop (watery poop, and it was green and not always fully digested), decreased appetite, and some dehydration because of the watery poop. He had had it for a long time before I got to him, though, so his symptoms may be more extreme than a bird who has just caught it.