title: BK virus antibody in population of various age groups in Beijing.
mesh_terms: D000367:Age Factors; D000914:Antibodies, Viral / Q000032:analysis*; D001739:BK Virus / Q000276:immunology*; D002681:China; D006801:Humans; D011120:Polyomavirus / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral