Brian Foss washes the top of a Gold'n Plump truck at R.J. Lanners Trucking in Sauk Rapids, Minn. Gold'n Plump started washing their trucks in an effort to keep the avian flu out of its chicken flocks. Foss said that washing the top of the truck was important because that's where the feed enters the truck. (Jackson Forderer for MPR News)

Truck WashAcid WashSemi TruckChickenAvian FluFeedGrain