(Erin Bormett | The Argus Leader via AP) In this May 4 photo, health care workers run a coronavirus testing site for Smithfield employees in the Washington High School parking lot on Monday, May 4, 2020 in Sioux Falls, S.D. North Dakota and South Dakota have the nation's worst rate of coronavirus deaths per capita in the last 30 days. Despite advances in treating coronavirus patients, hundreds more people in the Dakotas have died in recent weeks than during any other time of the pandemic.