Community workers wearing protective suits watch over a masked resident twirling a dragon shaped ribbon near a barricaded coronavirus testing site setup outside the Drum Tower, Wednesday, March 23, 2022, in Beijing, China. A fast-spreading variant known as "stealth omicron" is testing China's zero-tolerance strategy, which had kept the virus at bay since the deadly initial outbreak in the city of Wuhan in early 2020. (AP Photo/Andy Wong)