Nation Trump’s order to open meat plants brings anxiety to one Iowa town where 90% of COVID-19 cases are tied to Tyson April 29, 2020Donnelle Eller and Barbara Rodriguez, Des Moines RegisterComments Off on Trump’s order to open meat plants brings anxiety to one Iowa town where 90% of COVID-19 cases are tied to Tyson Black Hawk County has more coronavirus cases than any county in Iowa. 90% of the 1,326 cases are tied to the Tyson pork plant that closed last week.