A medical worker takes a swab sample from a child for COVID-19 test amid the pandemic in Mexico City, Mexico, Aug. 26, 2020. (Photo by Israel Rosas/Xinhua)

People line up outside a COVID-19 testing station amid the pandemic in Mexico City, Mexico, Aug. 26, 2020. (Photo by Israel Rosas/Xinhua)

Medical workers pose for a photo inside a COVID-19 testing station amid the pandemic in Mexico City, Mexico, Aug. 26, 2020. (Photo by Israel Rosas/Xinhua)

A medical worker takes a swab sample from a child for COVID-19 test amid the pandemic in Mexico City, Mexico, Aug. 26, 2020. (Photo by Israel Rosas/Xinhua)