The chi-squared test was used in order to evaluate the significance of differences observed between groups. For comparison of median values (analysis of CT values) the Mann Witney Utest was used. Prevalence Odds Ratio (POR = Pcases/(1-Pcases)/ Pcontrols/(1-Pcontrols)) was calculated in the total cohorts and by age group. Table 1 . HBoV-specific oligonucleotide primers and probes (all located at the NS gene).