title: [Determination of BK virus antibody in different age groups in a Beijing population].
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000914:Antibodies, Viral / Q000032:analysis*; D001739:BK Virus / Q000276:immunology*; D002648:Child; D002675:Child, Preschool; D006386:Hemagglutination Tests; D006801:Humans; D007223:Infant; D008875:Middle Aged; D011120:Polyomavirus / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral