The C.D.C. updates its definition of ‘close contact’ in relation to infection risk.

The Centers for Disease Control and Prevention changed its definition of what it means to be in close contact with an infected person and therefore at risk of contracting the coronavirus. The agency made the update in its published guidance for coronavirus contact tracing on Wednesday.

source https://www.nytimes.com/2020/10/21/world/the-cdc-updates-its-definition-of-close-contact-in-relation-to-infection-risk.html