The coronavirus can spread through tiny particles that sometimes float in the air for hours, according to the United States Centers for Disease Control.
The current guide says this route of transmission is still rare in the air – the larger droplets from coughing, sneezing, and speaking are still the primary source.
People are at a higher risk of catching it the longer they are and the closer they are to someone who has the virus.
Poorly ventilated, crowded and closed spaces are more risky than outdoors.
Last month, the CDC released draft guidance on a possible airborne transmission and then withdrew it because it was released in error.
At this point, the World Health Organization (WHO) announced that it was not aware of any new evidence to suggest that the virus spreads in this way, although it has agreed that aerosol transmission is possible under certain circumstances.
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