Adolescent Adult Aged Aged, 80 and over Antigens, Viral, Tumor/*metabolism Child Child, Preschool DNA, Viral/chemistry/genetics Female *Host-Pathogen Interactions Humans Infant Male Middle Aged Molecular Sequence Data Polyomavirus/*physiology Polyomavirus Infections/*epidemiology/virology Protein Binding Sequence Analysis, DNA Seroepidemiologic Studies Tumor Suppressor Proteins/*metabolism Young Adult