USPS Close Contact Tracing Program

Guidelines from the Federal Centers for Disease Control and Prevention define “close contact” as anyone who was within 6 feet of an infected person for a cumulative total of 15 minutes or more over a 24-hour period* starting from 2 days before illness onset (or, for asymptomatic patients, 2 days prior to test specimen collection) until the time the patient is isolated.

https://postaltimes.com/wp-content/uploads/2020/10/USPS-Close-Contact-Tracing-Program_11.2.20.pdf