A new study shows how mask mandates affect the number of COVID-19 cases during a pandemic.
Doctors from the University of Pennsylvania and Children’s Hospital of Pennsylvania reviewed the number of cases in the counties a few weeks after the introduction of the mandates on masks.
The study covered the period from March to October 2020, at a time when the peak of the disease was observed across the country.
The researchers found that, on average, daily cases decreased by 23% four weeks after the introduction of mask mandates compared to counties that did not have mask mandates.
Over time, the number of cases has improved.
Daily incidence decreased by 33% six weeks after the introduction of mask mandates compared to non-disguised constituencies.
Research shows that mask mandates have been more effective in urban districts.
The study comes as the CDC prepares to issue new recommendations on masks.