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Health Information on the Internet: Covid in the air
"A person infected with coronavirus — even one with no symptoms — may emit aerosols when they talk or breathe. Aerosols are infectious viral particles that can float or drift around in the air for up to three hours. Another person can breathe in these aerosols and become infected with the coronavirus."
"Airborne diseases pass from one person to another when microorganisms — such as bacteria, fungi, or viruses — travel through the air in aerosolized particles. Chickenpox, the common cold, and COVID-19 can all be transmitted in this way."
Wear masks with two or more layers to reduce airborne virus transmission