Zheng Yongheng (R) and another cured COVID-19 patient donate plasma at a mobile hospital in Wuhan, central China's Hubei Province, March 12, 2020. After undergoing a 14-day quarantine for further medical observation as a cured COVID-19 patient, Zheng Yongheng and other 84 patients were permitted to return home from a medical treatment station set up in Wuhan Vocational College of Software and Engineering. After the quarantine, Zheng immediately went to a hospital to donate her plasma in a bid to help other patients fight against COVID-19. (Xinhua/Xiong Qi)