NHS leaders are encouraging people with flu symptoms to mask up in public. Does the science support this advice?

In relation to the research reported here, there was no direct funding. Trish Greenhalgh has received funding for related work from Wellcome Trust and National Institute for Health and Care Research.

People on public transport are wearing face coverings again, while hospitals are asking staff and patients to mask up. Not just a blast of nostalgia for 2020, it’s due to a strain of flu rampaging ...