Desde que los coronavirus empezaron a extenderse por todo el mundo, se ha debatido sobre la eficacia de las mascarillas para prevenir el COVID-19. Un año y medio después, ¿qué pruebas hay?
- Assistant Professor of Environmental Health Sciences, University of California, Berkeley
Since the coronavirus first began spreading around the globe, people have debated how effective masks are at preventing COVID-19. A year and a half in, what does the evidence show?
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