Opisthorchis viverrini is commonly known as liver fluke, which is one of the parasite flatworms that infect millions of people in Southeast Asia. In some of the people it infects, it causes a deadly liver cancer. Food-borne trematode (parasite) infections are particularly prevalent in the wetlands of the middle and lower reaches of the Mekong region. Suitable ecological conditions allow the proliferation and dispersal of parasites. Furthermore, the life-cycle of parasites like O.viverrini are enhanced by the fishing and food cultures of local people who like to eat spicy dishes with raw, semi-cooked and fermented fish.