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KN95 is the most virus-proof of all masks

Val Edwards-Jones, an emeritus professor of medical microbiology at Manchester Metropolitan University was asked by the Daily Mail to track the growth of micro-organisms after coughing into a petri dish through different face coverings, ranging from cheap, disposable ones to more fashionable versions, to see the extent to which they prevented droplets from getting into the air.

'The World Health Organisation (WHO) has advised wearing triple-layer face coverings,' says Professor Edwards-Jones. 'But not all masks conform to WHO recommendations.'

While all masks tested in the experiment reduced the number of bacteria passed into the air, some blocked them fully while others allowed almost 80 per cent through.

Of all the masks tested, the KN95 was deemed to perform the best and blocked 100% of bacteria. 

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