A 'preponderance of evidence' suggests cloth masks could halt coronavirus in its tracks -- but only if we all wear them.
“The preponderance of evidence, in both laboratory and clinical settings, indicates that mask wearing reduces the transmissibility per contact by reducing transmission of infected droplets,” the letter notes. “The decreased transmissibility could substantially reduce the death toll, other harms to public health, job losses and economic losses. The cost of such masks is very low by comparison.
“Modeling suggests that widespread public mask use, in conjunction with other measures, could bring [down] the effective reproduction number ... thus halting the growth of the pandemic.” By now, those “other measures” should be familiar to most people: proper hand hygiene, social distancing, testing and contact tracing.can stop more than 90%
of the droplets that can spread the coronavirus. But that’s only the case when the mask captures droplets at the source, when worn by a person who’s infected. Since not all infected people show symptoms, everyone should wear a mask. The letter’s co-signers include a trove of noted academics, researchers and medical professionals, including Nobel Prize winners, medical school professors and editors of prestigious science and medical journals.cloth masks to be worn in all public places, such as stores, transportation systems, and public buildings as soon as possible,” the open letter says. “This action will prevent people who are infectious from unknowingly spreading the disease.
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