Xia Delian, 80, was infected with the "rotten leg disease" when he was 12. He had no money to see a doctor and had to buy medicine to treat the disease himself. Xia did not know the cause of the disease for a long time. His legs and feet were cured several years ago with the help of the germ warfare research institution in Lishui. [Photo by Pu Xiaoxu/Beijing Youth Daily via VCG]