National surveillance on human ecinococcosis has been performed since April 1999 when it was stipulated as a Category IV Disease under the Infectious Diseases Prevention Law. During the last 4 years of surveillance, 3 cases with unilocular hydatidosis (age range 27-81 years; median age 55 years) and 51 cases with alveolar hydatidosis (age range 15-86 years; median age 64 years) have been reported. The numbers of reported cases with alveolar hydatidosis have been increased with age, and the largest number reported in the age group > or = 71 years. Three cases with unilocular hydatidosis have been reported from health centers in Honshu, and were likely to be imported cases. Seventeen reported cases had clinical symptoms. None of the reported cases had information on infection route. Fifty out of 51 cases with alveolar hydatid disease have been reported from health centers in Hokkaido. When analyzing the cases by subdividing Hokkaido into six regional districts, large number of cases were reported from health centers in Ishikari-Shiribeshi-Iburi region (20 cases) and in Nemuro-Abashiri-Kushiro region (15 cases). As detailed addresses of the cases were masked, we compared the number of cases per 100,000 residents in regions. Health center in Nemuro-Abashiri-Kushiro region (2.13/100,000) had largest rate and second was Souya-Rumoi region (2.05/100,000). The results from current surveillance data only suggest the generation situation of human echinococcosis in several years ago or more, so the generation situation between 1999 April and 2002 December in surveillance is unknown.
|Number of pages||10|
|Journal||Kansenshogaku zasshi. The Journal of the Japanese Association for Infectious Diseases|
|Publication status||Published - 2005 Mar|
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