Photo taken on Feb. 13, 2020 shows a container used for transferring medical waste with an identifier written "novel coronavirus" at a medical waste disposal center in Changsha, capital of central China's Hunan province. Changsha has a whole process chain to dispose medical waste according to national standards. [Photo/Xinhua]

A staff member disposes medical waste at a medical waste disposal center in Changsha, capital of central China's Hunan province, Feb. 13, 2020. Changsha has a whole process chain to dispose medical waste according to national standards. [Photo/Xinhua]

A staff member disinfects the containers used for transferring medical waste at a medical waste disposal center in Changsha, capital of central China's Hunan province, Feb. 13, 2020. Changsha has a whole process chain to dispose medical waste according to national standards. [Photo/Xinhua]

A staff member disposes medical waste at a medical waste disposal center in Changsha, capital of central China's Hunan province, Feb. 13, 2020. Changsha has a whole process chain to dispose medical waste according to national standards. [Photo/Xinhua]

A staff member delivers the containers used for transferring medical waste at a medical waste disposal center in Changsha, capital of central China's Hunan province, Feb. 13, 2020. Changsha has a whole process chain to dispose medical waste according to national standards. [Photo/Xinhua]

A staff member operates a high temperature sterilization device to disinfect medical waste at a medical waste disposal center in Changsha, capital of central China's Hunan province, Feb. 13, 2020. Changsha has a whole process chain to dispose medical waste according to national standards. [Photo/Xinhua]

Photo taken on Feb. 13, 2020 shows a view of a medical waste disposal center in Changsha, capital of central China's Hunan province. Changsha has a whole process chain to dispose medical waste according to national standards. [Photo/Xinhua]

A staff member disinfects the vehicles used for transferring medical waste at a medical waste disposal center in Changsha, capital of central China's Hunan province, Feb. 13, 2020. Changsha has a whole process chain to dispose medical waste according to national standards. [Photo/Xinhua]

A staff member disinfects the containers used for transferring medical waste at a medical waste disposal center in Changsha, capital of central China's Hunan province, Feb. 13, 2020. Changsha has a whole process chain to dispose medical waste according to national standards. [Photo/Xinhua]