HBoV was detected in patients ranging from 3 months to 65.6 yr (mean = 36.2 months, median = 19 months) with a peak prevalence between the ages of 6 and 12 months (8. 6%, 22/257). Children aged 5 yr or less constituted 92.5% (86/93) of the HBoV-positive patients (Table 1) .