 Medical care and loss of wages caused by "Opisthorchis viverrini" in Laos and in Thailand costs about $120 million annually.Infection by "Opisthorchis viverrini" and other liver flukes in Asia affect the poor and poorest people.Opisthorchiasis is one of foodborne trematode infections (with clonorchiasis, fascioliasis and paragonimiasis) in the World Health Organization's list of neglected tropical diseases.