A man wearing a mask exercises in a gym in Mexico City, Mexico, on Sept. 21, 2020. Mexico's Health Ministry reported 2,917 new COVID-19 cases on Monday, bringing its national count to 700,580. (Photo by Montserrat Lopez/Xinhua)

A man wearing a mask walks his dogs on the campus of the National Autonomous University of Mexico, in Mexico City, Mexico, on Sept. 21, 2020. Mexico's Health Ministry reported 2,917 new COVID-19 cases on Monday, bringing its national count to 700,580. (Photo by Ricardo Flores/Xinhua)

A woman wearing a mask exercises in a gym in Mexico City, Mexico, on Sept. 21, 2020. Mexico's Health Ministry reported 2,917 new COVID-19 cases on Monday, bringing its national count to 700,580. (Photo by Israel Rosas/Xinhua)

People wearing masks are seen on the campus of the National Autonomous University of Mexico, in Mexico City, Mexico, on Sept. 21, 2020. Mexico's Health Ministry reported 2,917 new COVID-19 cases on Monday, bringing its national count to 700,580. (Photo by Ricardo Flores/Xinhua)