A health worker administers a dose of COVID-19 vaccine for a recipient at a mobile vaccination station in Qiongshan District of Haikou, south China's Hainan Province, April 15, 2021. Vaccination against COVID-19 has been made easier for Haikou residents as 20 bus-turned mobile vaccination stations were recently introduced at the service of vaccine recipients in need. (Xinhua/Guo Cheng)
