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New Covid wave has begun and masks should be worn again, scientists warn
(www.independent.co.uk)
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The disposable masks are reusable until they're dirty, worn or damaged. They shouldn't be reused if you think you've been in a high exposure area but if you wear it while in the corner store for 2 minutes, you can safely reuse it.
The only golden rule is, they're not like underwear. It's not okay to turn them inside out to the 'fresh' side indefinitely!