Li Huanying discusses with an American leprosy expert in Louisiana. (Photo courtesy of the Beijing Friendship Hospital affiliated to the Capital Medical University, and the Beijing Tropical Medicine Research Institute)

Li Huanying walks on a single-log bridge on her way to a leprosy-hit village. (Photo courtesy of the Beijing Friendship Hospital affiliated to the Capital Medical University, and the Beijing Tropical Medicine Research Institute)

Li Huanying pose for a picture with villagers in southwest China's Yunnan province. (Photo courtesy of the Beijing Friendship Hospital affiliated to the Capital Medical University, and the Beijing Tropical Medicine Research Institute)

Li Huanying works with her assistant. (Photo courtesy of the Beijing Friendship Hospital affiliated to the Capital Medical University, and the Beijing Tropical Medicine Research Institute)