Ten Things You Need to Know Today: 18 November 2021

The Week’s daily digest of the news agenda, published at 8am

1. Masks ‘most effective Covid measure’

Wearing a mask is the single most effective public health measure for avoiding Covid-19, reducing incidence by 53%, according to the first global study of its kind. A “systematic review and meta analysis” of public health and non-pharmaceutical approaches to tackling the virus found “several personal protective” measures, “including hand washing, mask wearing and physical distancing”, caused reductions in the incidence of Covid-19. In England, the legal requirement to wear a mask ended in July.

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