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Opisthorchis viverrini — SCE Infectious Diseases MCQ

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HardParasitologyOpisthorchis viverriniSCE Infectious Diseases

A traveller from rural Thailand has eosinophilia and biliary symptoms after eating raw freshwater fish. Stool contains small operculated eggs. Which parasite is most likely?

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Correct answer: D — Opisthorchis viverrini acquired from raw freshwater fish in South-East Asia

The best answer is “Opisthorchis viverrini acquired from raw freshwater fish in South-East Asia”. O. viverrini is endemic in South-East Asia and acquired from raw freshwater fish; chronic biliary infection is important because it increases cholangiocarcinoma risk. Raw freshwater fish in endemic South-East Asia transmits Opisthorchis viverrini, whose small operculated eggs and hepatobiliary disease distinguish it from other flukes.

Reference: WHO foodborne trematode infections fact sheet: https://www.who.int/news-room/fact-sheets/detail/foodborne-trematode-infections