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Epidemiological studies on metagonimiasis in akita prefecture japan 2. prevalence of the inhabitants around lake hachirogata


, : Epidemiological studies on metagonimiasis in akita prefecture japan 2. prevalence of the inhabitants around lake hachirogata. Japanese Journal of Parasitology 31(3): 135-140

An epidemiological survey of human metagonimiasis was conducted in 9 districts around Lake Hachhirogata by fecal examination, using a concentration method, during 1976-1977. Metagonimus yokogawai infections were found in 35.2-86.2% of 2276 inhabitants. Most of 1405 inhabitants with the helminth eggs was infected with M. yokogawai eggs (95.7%). Metacercariae of M. yokogawai were found in 9 spp of fish: Salangichthys microdon, Cyprinus carpio, Carassius auratus, Plecoglossus altivelis, Tribolodon hakonensis, Acheilognathus sp., Misgurnus angullicaudatus, Zacco platypus and Hypomesis transpacificus nipponensis. Among these fish, the infection rates of 5 spp., S. microdon, C. carpio, C. auratus, P. altivelis and T. hakonensis, were extremely high (95.3-100%). Fishing for S. microdon, which was the main source of infection, was prohibited in 1966 but has been permitted since 1975. The catch increased from 17 tons in 1975 to 47 tons in 1976. The [human] habit of eating freshwater fish such as S. microdon, C. carpio and C. auratus is still common.

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