Pat Daufeldt is a little more leery of the geese that fly over the grow sheds on her family’s turkey farm these days near West Liberty.

"Now is the time of the year geese are flying north, and we can’t do anything about that," Daufeldt said. "We just hope that they don’t leave any residue as they fly by."

That’s because geese and other fowl have been carrying and spreading avian influenza, killing flocks of turkeys and birds in several...