Could the mask—already seen by many scientists as the most effective shield against COVID-19—have yet another benefit? Some researchers now believe that they expose wearers to smaller, less harmful doses of the disease which spark an immune response.

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This as yet unproven theory suggests that masks could help inoculate people while we wait for a vaccine.

Non-medical fabric or disposable masks have been recommended across the world, mainly as a way to help stop infected people from spreading the new coronavirus.