People line up to get inoculated against the COVID-19 outside a mobile vaccination vehicle in Beibei District of southwest China's Chongqing, Aug. 20, 2021. Mobile vaccination vehicles were in service between 6 p.m. and 10 p.m. in some parts of Beibei District to facilitate COVID-19 vaccination. (Photo by Qin Tingfu/Xinhua)
A man has his body temperature checked before getting inoculated against the COVID-19 outside a mobile vaccination vehicle in Beibei District of southwest China's Chongqing, Aug. 20, 2021. Mobile vaccination vehicles were in service between 6 p.m. and 10 p.m. in some parts of Beibei District to facilitate COVID-19 vaccination. (Photo by Qin Tingfu/Xinhua)
A woman gets inoculated against the COVID-19 in a mobile vaccination vehicle in Beibei District of southwest China's Chongqing, Aug. 20, 2021. Mobile vaccination vehicles were in service between 6 p.m. and 10 p.m. in some parts of Beibei District to facilitate COVID-19 vaccination. (Photo by Qin Tingfu/Xinhua)
A woman gets inoculated against the COVID-19 in a mobile vaccination vehicle in Beibei District of southwest China's Chongqing, Aug. 20, 2021. Mobile vaccination vehicles were in service between 6 p.m. and 10 p.m. in some parts of Beibei District to facilitate COVID-19 vaccination. (Photo by Qin Tingfu/Xinhua)
A medical worker helps a girl register for COVID-19 vaccination outside a mobile vaccination vehicle in Beibei District of southwest China's Chongqing, Aug. 20, 2021. Mobile vaccination vehicles were in service between 6 p.m. and 10 p.m. in some parts of Beibei District to facilitate COVID-19 vaccination. (Photo by Qin Tingfu/Xinhua)
A medical worker helps a girl register for COVID-19 vaccination outside a mobile vaccination vehicle in Beibei District of southwest China's Chongqing, Aug. 20, 2021. Mobile vaccination vehicles were in service between 6 p.m. and 10 p.m. in some parts of Beibei District to facilitate COVID-19 vaccination. (Photo by Qin Tingfu/Xinhua)