Current situation of human Taenia asiatica taeniosis in Japan
2021
Yamasaki, Hiroshi | Morishima, Yasuyuki | Sugiyama, Hiromu | Okamoto, Munehiro
This report describes 33 confirmed cases of “Taenia asiatica” taeniosis in Tokyo, Japan, and six adjacent prefectures between 2010 and 2019. Of the 33 cases, 28 were domestic infections. Thirty patients had histories of eating raw pork and/or beef liver. It was highly suspected that the sources of infection were foreigners from T. asiatica-endemic countries who had worked on pig farms in these prefectures. We postulated that the rate of domestic infection has decreased as a result of legal regulations that have banned the serving of raw and undercooked pig and cattle viscera in restaurants in Japan. Haplotype analyses of genetic markers revealed that “T. asiatica” in Japan are the descendants of hybrids of T. asiatica and Taenia saginata that originated from the Philippines and/or Taiwan. It is critical that close attention continues to be paid to domestic recurrences and imported cases of T. asiatica taeniosis, with the goal of communicating information on risk factors for this infection to consumers, pig farmers, restaurant owners, physicians, and visitors coming to Japan.
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