Mushi-Shi S02 E19 Mud Grass

"The cure lies in the curse."

Shigeru's daughter (Yuri) is found dead in the mountains. A painful skin infection breaks out in his village. Ginko can cure the disease of the villagers but Shigeru has a much more serious case. It turns out that he and the son of his deceased brother brought back the mushi causing the problem to the village when they broke a taboo.