Employers will have to revise their COVID-19-related safety policies and practices to meet new guidelines from the U.S. Centers for Disease Control and Prevention (CDC) on what it means to have been in "close contact" with an infected person.
Read entire article - https://www.shrm.org/resourcesandtools/legal-and-compliance/employment-law/pages/new-cdc-guidance-makes-contact-tracing-more-difficult-for-employers.aspx