More than 1,000 workers at the Tyson Foods plant in Waterloo have tested positive for the coronavirus, a county public health leader said Thursday — more than double the number Gov. Kim Reynolds had said the day before. The news came as the Arkansas-based company reopened the plant Thursday after a two-week closure following a spike in COVID-19 cases there. The 1,031 Tyson employees confirmed to have the coronavirus included workers who were tested at the plant during the shutdown as well as at private health-care providers, Black Hawk County public officials said. The number includes workers who exhibited no symptoms.