In a speech on 3 August 2020 WHO Director-General Dr Tedros Adhanom Ghebreyesus said ‘the mask has come to represent solidarity’. What he did not mention was any new evidence behind the policy change. In fact, the WHO’s guide, Mask use in the context of Covid-19,23 published on 1 December 2020, said, ‘At present there is only limited and inconsistent scientific evidence to support the effectiveness of masking of healthy people in the community to prevent infection with respiratory viruses, including SARS-CoV-2.’ The European Centre for Disease Prevention and Control (ECDC) concurs that
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