Medical workers wave farewell a recovered patient in Changchun, northeast China's Jilin Province, March 10, 2020. The patient diagnosed with the novel coronavirus disease (COVID-19) has been cured and discharged from hospital, bringing the number of COVID-19 patients being treated in hospitals to zero in Changchun. (Photos: Xinhua)

Medical workers wave farewell a recovered patient in Changchun, northeast China's Jilin Province, March 10, 2020. The patient diagnosed with the novel coronavirus disease (COVID-19) has been cured and discharged from hospital, bringing the number of COVID-19 patients being treated in hospitals to zero in Changchun.

A recovered patient salutes to the medical workers in Changchun, northeast China's Jilin Province, March 10, 2020. The patient diagnosed with the novel coronavirus disease (COVID-19) has been cured and discharged from hospital, bringing the number of COVID-19 patients being treated in hospitals to zero in Changchun.

A recovered patient salutes to medical workers in Changchun, northeast China's Jilin Province, March 10, 2020. The patient diagnosed with the novel coronavirus disease (COVID-19) has been cured and discharged from hospital, bringing the number of COVID-19 patients being treated in hospitals to zero in Changchun.

A recovered patient waves to medical workers in Changchun, northeast China's Jilin Province, March 10, 2020. The patient diagnosed with the novel coronavirus disease (COVID-19) has been cured and discharged from hospital, bringing the number of COVID-19 patients being treated in hospitals to zero in Changchun.