Members of the first group of imported COVID-19 patients diagnosed at Suifenhe port in Northeast China's Heilongjiang province who were cured and discharged from the hospital on April 21, 2020 wave goodbye to medics. (Photo by Pan Songgang/For chinadaily.com.cn)

Members of the first group of imported COVID-19 patients diagnosed at Suifenhe port in Northeast China's Heilongjiang province who were cured and discharged from the hospital on April 21, 2020 wave goodbye to medics.

Members of the first group of imported COVID-19 patients diagnosed at Suifenhe port in Northeast China's Heilongjiang province who were cured and discharged from the hospital on April 21, 2020 wave goodbye to medics.

Members of the first group of imported COVID-19 patients diagnosed at Suifenhe port in Northeast China's Heilongjiang province who were cured and discharged from the hospital on April 21, 2020 wave goodbye to medics.