Spatial distribution of, and risk factors for, Opisthorchis viverrini infection in southern Lao PDR.
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.viverrini, but epidemiological studies are scarce and the spatial distribution of infection remains to be determined.Our aim was toor kniv