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The authors encountered an outbreak of acute hepatitis in a public institute for mentally retarded children in Aomori Prefecture, Japan. Studies revealed that the probable vehicles of transmission of infection were contaminated water, contaminated meals, and close contact. From the clinical manifestations and epidemiological investigations of 41 affected children and staff members, an outbreak of hepatitis A was strongly suspected. Immune electron microscopy disclosed hepatitis A virus antigen particles in the stool specimens collected during the few days before and after peak transaminase elevation. Hepatitis A antigen was further extracted and purified. The antigen was the first reported recovery of the virus from a natural outbreak of hapatitis A in Asia. Subsequently, with the immune adherence hemagglutination test, using this extracted antigen, an increase in titer of antibody to hepatitis A antigen was demonstrated. Thus, this epidemic was serologically established as an outbreak of hepatitis A. Human immune serum globulin for the protection against hepatitis A was administrated to the 80 individuals concerned, and it was effective in preventing the clinical manifestation of hepatitis.
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F Tsuda, and
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M Mayumi
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[Hokkaido igaku zasshi] The Hokkaido journal of medical science,
H Nara, and
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M Ookawa, and
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H Yoshizawa, and
M Mayumi
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M Mayumi
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M Mayumi
January 1980,
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H Nara, and
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M Mayumi
July 1985,
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H Yoshizawa, and
M Mayumi
October 1981,
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M Mayumi
March 1963,
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H Nara, and
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M Mayumi
June 1994,
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