Clonorchiasis is endemic in areas of East Asia including the Korean peninsula, China, Taiwan, Japan and Vietnam.  It has been reported in non-endemic areas in Asian immigrants or following ingestion of imported, undercooked or pickled freshwater fish containing the metacercariae.  (DPDx: Parasites and Health).  An estimated 7 million people are infected in the heavily populated regions of these areas, including 25% of the human population in South-Korea and 13.7% of the population in Vietnam (WHO). Fortunately, the incidence in China and Japan has been decreasing in recent decades.
The disease can last up to 30 years in immigrants coming from endemic areas.  However, it will not become endemic to these areas because suitable intermediate hosts are not present.  Human infection only occurs when man ingests raw, inadequately cooked, dried, salted, or pickled fresh-water fish containing encysted metacercariae. 

(Tropical Medicine Resource Center http://tmcr.usuhs.mil/tmcr/chapter21/intro.htm)


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