"Most disturbing, bees that ate pollen contaminated with fungicides were three times as likely to be infected by the parasite. "
I recently heard some speakers from the University of Nebraska, Lincoln speak. I think contaminated pollen is where research is going to focus on in the future. Pollen is the food choice for brood and nurse bees. They also think viruses can be transmitted by foragers working the same bloom. A forager contaminated with a virus works a blossom gathering pollen which is then worked by another forager from another colony thus contaminating the subsequent visitors to that blossom. Very similar to human reaction. (If you are sick you should stay home from work.)
