People line up outside a COVID-19 testing station during COVID-19 pandemic in Mexico City, Mexico, Aug. 1, 2020. (Photo by Sunny Quintero/Xinhua)

People are seen wearing face masks during COVID-19 pandemic in Mexico City, Mexico, Aug. 1, 2020. (Photo by Sunny Quintero/Xinhua)

A medical worker reacts inside a COVID-19 testing station during COVID-19 pandemic in Mexico City, Mexico, Aug. 1, 2020. (Photo by Sunny Quintero/Xinhua)

A woman is seen with a face shield during COVID-19 pandemic in Mexico City, Mexico, Aug. 1, 2020. (Photo by Sunny Quintero/Xinhua)

A medical worker takes a swab sample from a man for COVID-19 test during COVID-19 pandemic in Mexico City, Mexico, Aug. 1, 2020. (Photo by Sunny Quintero/Xinhua)

A man (R) reacts after undergoing a swab sample test for COVID-19 during COVID-19 pandemic in Mexico City, Mexico, Aug. 1, 2020. (Photo by Sunny Quintero/Xinhua)