Mr. Ye, a cured COVID-19 patient, donates plasma at Ningxia Blood Center in Yinchuan, northwest China's Ningxia Hui Autonomous Region, March 1, 2020. Mr. Ye donated 400 mm of plasma here on Sunday, which will be used to treat patients infected with COVID-19. Mr. Ye was the 6th cured patient donating plasma in Ningxia, where the first plasma-treated patient was discharged from hospital on Feb. 29. (Xinhua/Feng Kaihua)

A staff member labels a bag filled with donated plasma at Ningxia Blood Center in Yinchuan, northwest China's Ningxia Hui Autonomous Region, March 1, 2020. Mr. Ye donated 400 mm of plasma here on Sunday, which will be used to treat patients infected with COVID-19. Mr. Ye was the 6th cured patient donating plasma in Ningxia, where the first plasma-treated patient was discharged from hospital on Feb. 29. (Xinhua/Feng Kaihua)

A staff member checks the condition of Mr. Ye, a cured COVID-19 patient, before his plasma donation at Ningxia Blood Center in Yinchuan, northwest China's Ningxia Hui Autonomous Region, March 1, 2020. Mr. Ye donated 400 mm of plasma here on Sunday, which will be used to treat patients infected with COVID-19. Mr. Ye was the 6th cured patient donating plasma in Ningxia, where the first plasma-treated patient was discharged from hospital on Feb. 29. (Xinhua/Feng Kaihua)

A staff member tests the blood of Mr. Ye, a cured COVID-19 patient, before the latter's plasma donation at Ningxia Blood Center in Yinchuan, northwest China's Ningxia Hui Autonomous Region, March 1, 2020. Mr. Ye donated 400 mm of plasma here on Sunday, which will be used to treat patients infected with COVID-19. Mr. Ye was the 6th cured patient donating plasma in Ningxia, where the first plasma-treated patient was discharged from hospital on Feb. 29. (Xinhua/Feng Kaihua)

Staff members thank Mr. Ye, a cured COVID-19 patient, for donating plasma at Ningxia Blood Center in Yinchuan, northwest China's Ningxia Hui Autonomous Region, March 1, 2020. Mr. Ye donated 400 mm of plasma here on Sunday, which will be used to treat patients infected with COVID-19. Mr. Ye was the 6th cured patient donating plasma in Ningxia, where the first plasma-treated patient was discharged from hospital on Feb. 29. (Xinhua/Feng Kaihua)

Mr. Ye, a cured COVID-19 patient, donates plasma at Ningxia Blood Center in Yinchuan, northwest China's Ningxia Hui Autonomous Region, March 1, 2020. Mr. Ye donated 400 mm of plasma here on Sunday, which will be used to treat patients infected with COVID-19. Mr. Ye was the 6th cured patient donating plasma in Ningxia, where the first plasma-treated patient was discharged from hospital on Feb. 29. (Xinhua/Feng Kaihua)