An 83-year-old cured patient gestures as she leaves the Leishenshan (Thunder God Mountain) Hospital in Wuhan, capital of central China's Hubei Province, Feb. 18, 2020. Leishenshan Hospital, a makeshift hospital built in Wuhan amid the novel coronavirus disease (COVID-19), Tuesday saw its first two cured patients. (Xinhua/Xiao Yijiu)

Ms Yang shows a photo of her newborn son at a hospital in Wuhan, central China's Hubei Province, Feb. 18, 2020. Yang gave birth to a baby during her treatment of novel coronavirus pneumonia. The baby is now in medical observation with all physical states normal. (Xinhua/Wang Yuguo)

Zoran Milanovic takes the oath during his presidential inauguration ceremony in Zagreb, capital of Croatia, on Feb. 18. 2020. Former Prime Minister Zoran Milanovic was sworn in here on Tuesday as the fifth Croatian president at the President's Office. (Damir Sencar/Hina/Handout via Xinhua)

A video cheering for China in fighting against the novel coronavirus disease (COVID-19) is played outside the building of the Seoul Metropolitan Government in Seoul, South Korea, Feb. 18, 2020. The Seoul Metropolitan Government has been playing videos cheering for China in fighting against COVID-19 outside the government building and in several subway stations since Feb. 15. (Xinhua/Wang Jingqiang)

Fan Xungui walks home after visiting villagers in Yongzhen Village, Rudong Township of Lixian County, central China's Hunan Province, Feb. 17, 2020. Fan Xungui, 62, has served as the village doctor of Yongzhen Village since 1980. Since the novel coronavirus outbreak, Fan has insisted riding his scooter dozens of miles everyday to check the body temperature of the villagers at their own houses, and to teach them the knowledge of the novel coronavirus prevention. With efforts of Fan and all the others in Yongzhen Village, the village has reported zero confirmed or suspected case since the outbreak. (Photo by Chen Sihan/Xinhua)

A plane is seen during sunset in Washington D.C., the United States, Feb. 17, 2020. (Xinhua/Liu Jie)

Photo taken on Feb. 17, 2020 with a tilt-shift lens shows a temporary hospital converted from Wuhan Sports Center in Wuhan, central China's Hubei Province. The temporary hospital converted from Wuhan Sports Center designated to treat the COVID-19 patients in Wuhan has been in good order since the hospitalization of its first batch of patients on Feb. 12. (Xinhua/Xiao Yijiu)

A resident takes body temperature check during a health screening campaign at Qingheju Community in Qingshan District of Wuhan, capital city of central China's Hubei Province, Feb. 18, 2020. Wuhan launches a slew of wide-ranging and more stringent measures from Feb. 17to 19 to control the epidemic. (Xinhua/Cheng Min)

The Tokyo Tower is lit in red to support the battle against the novel coronavirus in China, in Tokyo, Japan, Feb. 18, 2020. (Xinhua/Du Xiaoyi)

Photo taken on Feb. 4, 2020 shows a cloud of locusts flying in Mwingi North, Kenya. A number of East African countries are suffering serious locust infestation, with Kenya experiencing its worst in 70 years, which, if left unchecked, could grow 500 times in scale by June, a UN spokesman said Friday. Stephane Dujarric, spokesman for the UN secretary-general, said besides Kenya, Somalia and Ethiopia are undergoing their worst locust infestation in 25 years, and that Djibouti, Eritrea, Uganda and Tanzania are also experiencing swarm activity and locust breeding, while the risk of spread to South Sudan is high. (Xinhua/Fred Mutune)

Dr. Tedros Adhanom Ghebreyesus (C), World Health Organization (WHO) Director-General, addresses a press conference in Geneva, Switzerland, Feb. 17, 2020. The WHO said Monday that China's latest epidemiological paper on COVID-19 is important in enabling it to provide advice to other countries. (Xinhua/Chen Junxia)