Sweden's top pandemic expert has claimed there is “very weak” evidence that mask wearing in society is effective.
Anders Tegnell, Sweden's state epidemiologist, said it was “dangerous” to believe masks could make “huge difference” in the fight against Covid-19.
Speaking to the BBC Radio 4 Today programme, Mr Tegnell said: "Unfortunately, the evidence between using masks in society is very weak... we don't really have a good idea of where they should be used, (and) to what extent.”
He added that despite a lot of European countries making masks mandatory they are now experiencing a surge in cases.
“I think it's dangerous to believe that masks will make a huge difference when you have an epidemic like this one,” he said.
Sweden is also considering reducing restrictions for its elderly and shielding population, he added, and the country's increase in cases has been "slowing down".
However, a recent study from Simon Fraser University found the use of masks can almost half the number of new Covid-19 cases.
Covering the face indoors resulted in up to
46 per cent fewer new Covid-19 cases every week in Canada, the researchers found.