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Knowledge Circle

Centers for Diseases Control and Prevention (CDC)
Website information
Contact Tracing for COVID-19: Coronavirus Disease 2019 (COVID-19)


For COVID-19, a close contact is defined as any individual who was within 6 feet of an infected person for at least 15 minutes starting from 2 days before illness onset (or, for asymptomatic patients, 2 days prior to positive specimen collection) until the time the patient is isolated. The public health evaluation of close contacts to patients with laboratory-confirmed or probable COVID-19 may vary depending on the exposure setting. Contacts in special populations and/or congregate settings require additional considerations and may need hand off to a senior health department investigator or special team


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