McDonald County in southwest Missouri reported 196 new coronavirus cases Sunday, The Kansas City Star reports.
The county of about 23,000 residents now has a total of 434 confirmed cases.
McDonald County is home to two poultry processing plants: one owned by Tyson Foods, and another owned by Simmons Foods.
Tyson Foods did not answer how many of its Missouri workers tested positive for COVID-19. The company announced last week that it will begin to do large-scale testing of its workers in McDonald County.
Tyson workers are screened for symptoms before each shift. However, local health officials said most of the newly reported cases in McDonald County were asymptomatic.
There have been other COVID-19 outbreaks at processing plants around the state and country. At Triumph Foods in St. Joseph, over 490 workers tested positive.