![](http://www.ecns.cn/hd/2020/02/18/0b0914a1ef1d493797e7e33734cff021.jpg)
A recovered coronavirus patient donates plasma at Changsha Blood Center in Changsha, central China's Hunan Province, Feb. 18, 2020. Cured patients who were infected with COVID-19 are called upon to donate plasma as initial results had indicated the effectiveness of convalescent plasma-derived therapeutic products in curing infected patients in severe and critical conditions. Some recovered patients regard the donation as a way to pay back to the society after they received timely and effective treatment. (Photo: China News Service/ Yang Huafeng)
![](http://www.ecns.cn/hd/2020/02/18/5a0fff07f381434e95a6438de00afafd.jpg)
A recovered coronavirus patient donates plasma at Changsha Blood Center in Changsha, central China's Hunan Province, Feb. 18, 2020. Cured patients who were infected with COVID-19 are called upon to donate plasma as initial results had indicated the effectiveness of convalescent plasma-derived therapeutic products in curing infected patients in severe and critical conditions. Some recovered patients regard the donation as a way to pay back to the society after they received timely and effective treatment. (Photo: China News Service/ Yang Huafeng)
![](http://www.ecns.cn/hd/2020/02/18/cd77b73353e44eaabe2cbc033de806f2.jpg)
A recovered coronavirus patient donates plasma at Changsha Blood Center in Changsha, central China's Hunan Province, Feb. 18, 2020. Cured patients who were infected with COVID-19 are called upon to donate plasma as initial results had indicated the effectiveness of convalescent plasma-derived therapeutic products in curing infected patients in severe and critical conditions. Some recovered patients regard the donation as a way to pay back to the society after they received timely and effective treatment. (Photo: China News Service/ Yang Huafeng)
![](http://www.ecns.cn/hd/2020/02/18/a1e22d85e2d2499e91e512fb7da8e34d.jpg)
A recovered coronavirus patient donates plasma at Changsha Blood Center in Changsha, central China's Hunan Province, Feb. 18, 2020. Cured patients who were infected with COVID-19 are called upon to donate plasma as initial results had indicated the effectiveness of convalescent plasma-derived therapeutic products in curing infected patients in severe and critical conditions. Some recovered patients regard the donation as a way to pay back to the society after they received timely and effective treatment. (Photo: China News Service/ Yang Huafeng)
![](http://www.ecns.cn/hd/2020/02/18/d353b23552e941db8eb5e906f4d6af58.jpg)
A recovered coronavirus patient donates plasma at Changsha Blood Center in Changsha, central China's Hunan Province, Feb. 18, 2020. Cured patients who were infected with COVID-19 are called upon to donate plasma as initial results had indicated the effectiveness of convalescent plasma-derived therapeutic products in curing infected patients in severe and critical conditions. Some recovered patients regard the donation as a way to pay back to the society after they received timely and effective treatment. (Photo: China News Service/ Yang Huafeng)