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Aerosol

Updated at 6:03 p.m. ET

The Centers for Disease Control and Prevention posted guidance Friday evening saying that aerosol transmission might be one of the "most common" ways the coronavirus is spreading — and then took the guidance down on Monday.

The now-deleted updates were notable because so far the CDC has stopped short of saying that the virus is airborne.

The World Health Organization has issued a new scientific brief that summarizes what's known about the different ways the coronavirus can transmit.