Clonorchis sinensis, often called the Chinese liver fluke, is an extremely common human parasite that causes clonorchiasis, a parasitic infection of the biliary tract (bile ducts) and liver. It is typically acquired by eating raw or undercooked freshwater fish—aka sushi. These parasitic infections can lead to inflammation, gallstones, and potentially bile duct cancer (cholangiocarcinoma). Unfortunately most of these infections are asymptomatic, meaning you won't even know you have them, until is