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CDC updates COVID-19 guidance again, saying airborne transmission is possible

The CDC again updated its COVID-19 guidance on Monday, saying that airborne transmission is possible, particularly in poorly ventilated indoor spaces.

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The U.S. Centers for Disease Control and Prevention has again updated its COVID-19 guidance, saying Monday that airborne transmission is possible, particularly in poorly ventilated indoor spaces.

COVID-19 is most commonly spread through close contact, according to the guidance.

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But there have been cases where people have contracted COVID-19 from someone who they didn't come into close contact with.

"There is evidence that under certain conditions, people with COVID-19 seem to have infected others who were more than 6 feet away," the CDC wrote in its updated guidance. "These transmissions occurred within enclosed spaces that had inadequate ventilation. Sometimes the infected person was breathing heavily, for example, while singing or exercising."

It's also believed that it's possible for someone to become infected by COVID-19 from it lingering in the air — although it's not stated how long of a period it could remain there.

Last month, the CDC had originally posted guidance about possible airborne transmission and then removed the information from its website.

"A draft version of proposed changes to these recommendations was posted in error to the agency's official website," Jason McDonald, a CDC spokesman, said in a response emailed to CNN last month. "CDC is currently updating its recommendations regarding airborne transmission of SARS-CoV-2 (the virus that causes COVID-19). Once this process has been completed, the update language will be posted."

This is a breaking news story. Check back for updates.