A medical worker wears protective clothing while performing a nucleic acid test on a client from behind glass at a small private testing site on August 6, 2021 in Beijing, China. While cases still remain relatively low compared to many countries, China is battling its worst COVID-19 outbreak in months after workers in the arrivals area at Nanjing International Airport were infected with the highly contagious Delta variant and it has since spread to dozens of cities in at least 18 provinces. (Photo by Kevin Frayer/Getty Images)
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