Professor Dame Jenny Harries, said that the evidence for masks is ‘uncertain’
She told the Covid inquiry that advice on how to make a mask was ‘ineffective’
There is no solid proof masks ever slowed the spread of Covid, England’s former deputy chief medical officer said today.
Professor Dame Jenny Harries, who now heads up the UK Health Security Agency, said the evidence that coverings reduced transmission is ‘uncertain’ because it is difficult to separate their effect from other Covid curbs.
She also told the UK’s Covid inquiry that government advice on how to make a mask using two pieces of cloth was ‘ineffective’.

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