title: [The prevalence of antibody to hepatitis A virus in different age groups of Hokkaido inhabitants (author's transl)].
abstract: Serum specimens drawn at random from Hokkaido inhabitants were tested for antibody to the hepatitis A virus (anti-HAV) by radioimmunoassay. The prevalence in different age groups was as follows, cord blood and newborn infants 44.4%, under one year 0%, 1-9 years 5.3%, 10-19 years 0%, 20-29 years 9.1%, 30-39 years 80%, 40-49 years 90%, and over 50 years 100%. This survey confirmed that antibody against HAV could pass through placenta and HAV had been very common virus by the 1950's in Hokkaido.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000914:Antibodies, Viral / Q000032:analysis*; D002648:Child; D002675:Child, Preschool; D006507:Hepatovirus / Q000276:immunology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007564:Japan; D008875:Middle Aged
chemical_list: D000914:Antibodies, Viral