Iowa currently has one of the highest rates of infection in the nation, with 15% of tests last week coming back positive. Nearby South Dakota has a positive test rate of 19% and North Dakota is at 18%, according to a Reuters analysis. The surge in Iowa and South Dakota is being linked to colleges reopening in Iowa and an annual motorcycle rally last month in Sturgis, South Dakota. Kansas, Idaho and Missouri are also among the top 10 states for positive test rates.