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By Mayo Clinic Staff

The virus that causes COVID-19 spreads mainly through the air when a person coughs, sneezes, sings, talks or breathes. Virus particles can drift in the air and be inhaled, especially in crowded places with poor airflow. Face masks or respirators are products that cover the nose, mouth and chin. Most research finds that these products can slow the spread of the virus that causes COVID-19 when they are worn consistently, fit properly and are worn correctly.

Wear a mask if you have symptoms of illness, if you are near others who are sick or if you're in a crowded indoor area. This is especially important if COVID-19 illness rates in your area are high.

But face masks aren't safe for everyone. Don't put a mask on anyone who has trouble breathing or is unconscious or otherwise unable to remove the mask without help. And don't put masks on children younger than age 2.