An epidemiologist explains the CDC's new guidelines on 'close contact' and how to follow them

The CDC's new guidance on "close contact" could improve contact tracing and lower infection rates.
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New guidance from the CDC suggests new evidence has emerged on how contagious COVID-19 really is, says Ryan Malosh, an epidemiologist who studies respiratory virus transmissions.
It suggests that spending even 15 minutes of contact with a person infected with COVID-19 can lead to transmission, whether you stand six feet apart or not. 
This insight trumps our initial assumption