Here is what the world health body has to say on the usage of facemasks as a protetive gear against coronavirus —

If you are healthy, you only need to wear a mask if you are taking care of a person with the suspected 2019-nCoV infection.

Wear a mask if you are coughing or sneezing.

Masks are effective only when used in combination with frequent hand-cleaning with alcohol-based hand rub or soap and water.

If you wear a mask, then you must know how to use it and dispose of it properly.

There has been a lot of confusion over the usage of facemasks against coronavirus. The World Health Organisation says that a person should wear a facemask if she or he is taking care of a person with Covid-19 infection.