Face masks can prevent wearers from developing a serious case of Covid-19 by cutting the amount of virus in the body, scientists have found.
It means face coverings not only protect other people, but they also mean that if the person wearing it does become infected, their symptoms are milder, they say.
It became compulsory to wear face masks in shops in England last month, and in other public enclosed spaces at the weekend.
Monica Gandhi, an infectious disease doctor at the University of California, San Francisco, says people wearing masks will take in fewer coronavirus particles, making it easier for their immune systems to cope.
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