Seperate sick employees:

If an employee is confirmed to have COVID-19 infection, employers should inform fellow employees of their possible exposure to COVID-19 in the workplace but maintain confidentiality as required by the workplace policies. 

Employees who appear to have symptoms (i.e., fever, cough, or shortness of breath) upon arrival at work or who become sick during the day should immediately be separated from other employees, customers, and visitors and sent home.