there is fluid in it i was going to pop it but didnt want to hurt it,this is my first time breeding so im not sure what paratyphoid looks like all my other ybs are fine and so are the old birds.
Yellow spots in the throat would be trich use chevi-col or spartrix make sure u treat for a sufficient lenght of time you shouldnt have a big problem as trich does not repoduce at low temperatures in the drinker.