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People wearing face masks visit the Lincoln Memorial in Washington, D.C., the United States, on Oct. 16, 2020. According to a recent study by Carnegie Mellon University, D.C. has the highest rate of mask-wearing and the lowest percentage of people who know someone with Covid-19 symptoms in the country. (Photo: Xinhua/Ting Shen via Getty Images)

People wearing face masks visit the Lincoln Memorial in Washington, D.C. on Oct. 16, 2020. According to a recent study by Carnegie Mellon University, D.C. has the highest rate of mask-wearing and the lowest percentage of people who know someone with Covid-19 symptoms in the country. (Photo: Xinhua/Ting Shen via Getty Images)

Universal Mask-Wearing Would Save Nearly 130,000 Lives by Spring 2021, Study Finds

Separate research showed that in states where people frequently or always wear face coverings in public, fewer people know someone who has had symptoms of Covid-19 in their communities.

Julia Conley, staff writer

As Covid-19 cases surged in the U.S.—with eight states setting single-day records on Thursday and hospitals in Utah and Wisconsin reporting that they're overwhelmed with sick patients—two new studies released Friday reaffirmed public health guidance that the more mask-wearing is observed in a community, the less likely it is to face coronavirus outbreaks and deaths. 

The Institute for Health Metrics and Evaluation (IHME) at the University of Washington released a model showing that nearly 130,000 people's lives would be saved from now until early spring 2021 if the U.S. adopted universal mask-wearing. 

"I'd like for people to see this study as a call to action, sort of a wake-up call, especially for those individuals who are unconvinced by the devastation that this pandemic is causing."
—Shweta Bansal, Georgetown University

Publishing the study in the journal Nature Medicine, the IHME analyzed the number of cases, testing rates, mask use, and cellphone data to estimate people's movements from the date of the first recorded case in each state through September 21. Using this data, the researchers estimated what the death toll until March 2021 would be for each state if mask-wearing and social distancing mandates are put in place, versus if they are not. 

If 95% of the U.S. population spent the remainder of the fall and the winter months following public health guidance to wear face coverings when using public transportation, running errands, working, and doing other activities in public, 129,574 lives would be saved, the IHME estimated. Even compliance by 85% of the public would have a major impact, preventing 95,814 deaths from Covid-19. 

"Increasing mask use is one of the best strategies that we have right now to delay the imposition of social distancing mandates and all the economic effects of that, and save lives," Christopher Murray, director of the institute, told the New York Times. 

Public health officials are up against the Trump administration as they attempt to convince the public to use face masks. Earlier this month, President Donald Trump openly mocked Democratic presidential candidate Joe Biden for wearing a mask at public events—days before Trump himself was diagnosed with Covid-19. Last week, Dr. Scott Atlas, who is one of the president's top coronavirus advisers despite his lack of public health experience, tweeted, "Masks work? No." The tweet was removed by Twitter for spreading misinformation. 

Shweta Bansal, an infectious disease researcher at Georgetown University who was not involved in the IHME's study, told the Times that the key finding by the institute is that "we can will this number [of deaths] out of existence." 

"I'd like for people to see this study as a call to action, sort of a wake-up call, especially for those individuals who are unconvinced by the devastation that this pandemic is causing," Bansal told the Times. 

A separate study out of Carnegie Mellon University's CovidCast project, also released Friday, showed how state-by-state, mask-wearing is helping to keep infection rates down—and how low levels of compliance with the public health guidance are having the opposite effect. 

Researchers partnered with Facebook to survey users about their mask-wearing habits and whether they know people in their communities who have had Covid-19 symptoms. 

Washington, D.C. residents reported the highest level of mask-wearing in the country, with 97% of respondents saying they wear face coverings whenever they are out in public. Just 11% of those surveyed said they knew someone who had had Covid-19. In Rhode Island and Massachusetts, where 93% of respondents said they always wear masks, 16% and 13%, respectively, said they knew someone who had had the illness. 

In South Dakota, just 65% of respondents said they regularly use a face mask, and 45% said they knew someone who had developed symptoms of the disease. Sixty-three percent of Wyoming residents said they wear masks, and 36% reported someone in their community had had symptoms. 

Dr. Linsey Marr, an expert at Virginia Tech in the field of airborne virus transmission, called the study "a powerful argument for wearing a mask, in visual form."

Alex Reinhart, a professor at Carnegie Mellon, noted that "there could be other explanations for the correlation" between mask-wearing and Covid-19 cases within communities in the study—but suggested the study does show adherence to public health guidance is helping to stop outbreaks from starting. 

"If people say they're not wearing masks, they may not be taking other protective measures either," Reinhart told the Washington Post. "So perhaps what we see is a combination of mask usage, other social distancing behaviors, and perhaps other factors we haven't measured."


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