A worker administers a test to a passenger at a drive-through site to collect samples for coronavirus disease (COVID-19) pandemic testing in Leesburg, Virginia, May 20, 2020.
Kevin Lamarque | Reuters
One of the components of contact tracing programs public health experts deem critical to controlling the Covid-19 outbreak includes finding and testing close contacts of known positive cases.
In terms of Covid-19, the U.S. Centers for Disease Control and Prevention defines a close contact as anyone who was within 6 feet of an infected person for at least 15 minutes starting two days before the onset of symptoms until the time the patient is isolated. For asymptomatic patients, or those who…