A line of Holstein dairy cows feed through a fence at a dairy farm in Idaho in this 2009 file photo. The highly pathogenic avian influenza is spreading rapidly through dairies and poultry farms in the region, and health experts say states could be doing more to test workers — many of whom are migrants — in order to prevent the disease among humans.(Charlie Litchfield / AP Photo)

Avian flu is a major concern across Oregon's agricultural environments. Dr. Ryan Scholz joins the Exchange to offer more insight. He's a state veterinarian at the Oregon Department of Agriculture. We'll learn about the depth of the problem in Oregon and why there's a constant watch on dairy cows to ensure they don't catch bird flu.