Looks to me like the Chinese "seeded" Covid 19 in Sious Falls.

A Sioux Falls meatpacking plant was forced to close when it became the epicenter of COVID-19 in South Dakota. Three weeks after executives from its Chinese owner, WH Group, visited the plant, a month after President Trump's ban on travel from China, nearly 600 of Smithfield Foods' 3,700 employees tested positive for the virus, as have 135 additional people in close contact with employees.

https://www.americanthinker.com/blog/2020/05/how_china_is_buying_up_americas_food_supply.html