Dame Jenny Harries, who now heads up the UK Health Security Agency, said that the evidence that face coverings reduce the spread of viruses is 'uncertain'.
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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'.
Studies showed at least three were needed for even a small effect on the spread of viruses, Dame Jenny said.