BACKGROUND: Opisthorchis viverrini is a food-borne trematode species that might give rise to biliary diseases and the fatal cholangiocarcinoma. In Lao PDR. an estimated 2. 5 million individuals are infected with O. https://www.roneverhart.com/Alpha-Epsilon-Phi-Gator-with-Bow-Game-Day-Embroidered-Button/