US CDC expands definition of 'close contact' for covid-19 un
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The Centers for Disease Control and Prevention (CDC) updated its recommendations for likely person-to-person spread of SARS-CoV-2 to warn about the risk of multiple, brief, "close contact" encounters with others who are positive for COVID-19.

According to the updated guidance, close contact is now someone 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 testing specimen collection) until the time the patient is isolated.

Previously, the CDC defined a “close contact" as someone who spent at least 15 consecutive minutes within 6 feet of a confirmed covid-19 case.

In a new report published investigators "determined that an individual who had a series of shorter contacts that over time added up to more than 15 minutes became infected."

Four factors associated with a higher risk for transmission are the proximity of each encounter, its duration, whether an interaction takes place indoors or outdoors, and the number of people encountered, said Jay Butler, MD, CDC deputy director for infectious diseases.

Butler acknowledged widespread fatigue with adherence to personal protection measures but added that social distancing, mask-wearing, and other measures are more important now than ever.

Source: https://www.cdc.gov/mmwr/volumes/69/wr/mm6943e1.htm?s_cid=mm6943e1_w
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