How much does a mask reduce coronavirus transmission?

11 months ago

It has been established that physical distance significantly reduces the risk of coronavirus transmission. But how much does wearing a mask help in this?

The first of its kind, using data from 16 countries on six continents, offers the first evidence that face masks and physical distance together most effectively prevent the spread of COVID-19.

The results, published in Lancet, based on an analysis of 25,000 patients with coronavirus, eliminate some of the “uncertainty” in this matter, says study co-author Derek Chu.

Researchers at the University of Canada McMaster found that the risk of transmitting coronavirus without preventive measures was 17.4%, with a mask or respirator it drops to 3.1%. The study also found that “physical distance is very effective, and every inch matters.”

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