A worker makes protective masks at a medical material manufacturer in Wuhan, central China's Hubei Province, Jan. 28, 2020. (Xinhua/Cai Yang)

A worker unloads medical and epidemic prevention supplies at Wuhan Tianhe International Airport in Wuhan, central China's Hubei Province, Jan. 28, 2020. (Xinhua/Cheng Min)

A worker carries drugs at a pharmaceutical company in Haikou, south China's Hainan Province, Feb. 3, 2020. The workshop of a pharmaceutical company in Haikou has been working round the clock since Jan. 20 to ensure the supply of drugs during the fight against novel coronavirus outbreak. (Photo by Pu Xiaoxu/Xinhua)

Workers make drugs at a pharmaceutical company in Haikou, south China's Hainan Province, Feb. 3, 2020. The workshop of a pharmaceutical company in Haikou has been working round the clock since Jan. 20 to ensure the supply of drugs during the fight against novel coronavirus outbreak. (Photo by Pu Xiaoxu/Xinhua)

A worker weighs drugs at the workshop of a pharmaceutical company in Haikou, south China's Hainan Province, Feb. 3, 2020. The workshop of a pharmaceutical company in Haikou has been working round the clock since Jan. 20 to ensure the supply of drugs during the fight against novel coronavirus outbreak. (Photo by Pu Xiaoxu/Xinhua)