How well do face masks protect?

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How well do face masks protect?

With a new highly contagious variant around, many countries are stepping up measures to try and stop its spread.

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In the UK, face coverings should be worn in most indoor crowded places. But what difference do they make?

Worn correctly, a simple cloth mask can trap big and smaller spit droplets that come out of your mouth and nose when you breathe, cough and sneeze.

They are not perfect, but work well enough to substantially lower the risk to the people around you should you be carrying coronavirus but are unaware.

If everyone wears a face covering, the protection is increased.

Face coverings also give the wearer some protection from other people's coughs and sneezes - but you should make sure you keep your mask clean and dry so that it is up to the job.

According to one study, fabric masks block at least 63% of fine particles. A surgical mask stops around 78%. Specially designed respirator masks – the ones worn by doctors working in intensive care – block 99.6%.

Face shields and masks with exhalation valves do not work as well because the virus spreads through aerosols and droplets that stay in the air.