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Researchers found that U.S. daily disease rates of Covid-19 illnesses were lower among states that had previously adopted mask mandates, while the growth in hospital admissions declined in the first two weeks after the implementation of statewide masking mandates.
A study published Sunday in the journal Clinical Infectious Diseases showed cases slopes of minus 1.08 per 100,000 per day in early adoptive states, and minus 0.37 percent per 100,000 per day among late adopters, compared with states that never adopted.
“Our findings support statewide mask requirements to reduce Covid-19 transmission,” they said.
Peter Rebeiro, David Aronoff, and Kevin Smith of Vanderbilt University School of Medicine found that in the US states and the District of Columbia, there were 15 early mask requirements adopters, 19 late adopters, and 17 never adopters.
The median Covid-19 rates per 100,000 were 5.70, 5.59 and 5.99 cases per day, respectively. “These analyzes advance the scientific evidence that positively impacts statewide mask requirements in the US,” they said.
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In a separate U.S. Centers for Disease Control and Prevention study, the growth in hospital admissions fell 5.5 percentage points among individuals 18-64 years old after mask mandates were implemented for more than three weeks.
Even a two-week mandate resulted in a 2.9 percentage point drop among adults aged 40-64.
The study, led by Heesoo Joo and Gabrielle Miller, concluded that statewide masking mandates may be associated with a reduction in transmission of Sars-CoV-2, the virus that causes Covid-19, and may contribute to a reduction of the growth rates of Covid-19 hospitalizations. .
The researchers analyzed admissions from March 22 to October 17, 2020 at 10 hospitals and hospital networks.
“Mask wearing is part of a multiple strategy to reduce exposure and transmission of Sars-CoV-2 and reduce the burden on the health care system, with likely direct effects on the morbidity of Covid-19 and the disease. associated mortality, ”they wrote.