Studies on  new coronavirus and other germs show wearing a mask helps stop infected people from spreading disease to others. Evidence also suggests that masks may offer some protection for the people wearing them.

The virus spreads from droplets people spray when they cough, sneeze or talk. Surgical or cloth face masks can block most of those particles from spreading.

While some droplets may still spread out, wearing a mask could reduce the amount, providing a benefit to others. Research shows people don’t get as sick when exposed to smaller amounts of virus, said Monica Gandhi, a virus expert at University of California, San Francisco.

And masks may protect the people wearing them by reducing the amount of droplets from others that might make contact with them.

In two U.S. food processing plants where masks were required and infection clusters occurred, Gandhi noted that most workers who developed Covid-19 had mild illness or no symptoms.

Research on a different coronavirus has also found low infection rates among people who frequently wore masks in public.

Experts say masks are particularly important with the new coronavirus because infected people can be contagious even if they don’t have symptoms.

AP