Seroprevalences of human polyomaviruses (PyV) as determined by VP1 seroreactivity among 460 study participants, by age group, New Hampshire, 1993–1995. The black, gray, horizontally striped, diagonally striped, and white bars correspond to the age groups 24–44 years (n = 46), 45–54 years (n = 70), 55–64 years (n = 106), 65–69 years (n = 131), and 70–75 years (n = 107), respectively. The overall seroprevalence (%) and number of participants who were seropositive (n) for each PyV were as follows—BK: 87.6% (n = 403); JC: 55.6% (n = 256); KI: 91.3% (n =420); WU: 97.4% (n = 448); MCV: 70.4% (n = 324); HPyV6: 73.7% (n = 339); HPyV7: 56.3% (n = 259); TSV: 80.9% (n = 372); HPyV9: 17.6% (n =81); and HPyV10: 99.1% (n = 456).