Members of the Chinese medical expert team attend a video conference on prevention of the coronavirus with China's embassies in South Sudan, Mauritania and Morocco held in Khartoum, Sudan, on June 5, 2020. (Xinhua/Ma Yichong)

Members of the Chinese medical expert team attend a video conference on prevention of the coronavirus with China's embassies in South Sudan, Mauritania and Morocco held in Khartoum, Sudan, on June 5, 2020. (Xinhua/Ma Yichong)