(Tom Stromme | The Bismarck Tribune via AP, File) In this Sept. 8 photo, Bismarck-Burleigh Public Health nurses Crys Kuntz, left, and Sara Nelson confer inside the Bismarck Event Center in Bismarck, N.D., where vehicles were lined up for the weekly drive-thru COVID-19 testing. The coronavirus tightened its grip on the American heartland, with hospitals in Wisconsin and North Dakota running low on space, and the NFL postponing a game over an outbreak that's hit the Tennessee Titans football team.