Furthermore , IgG seroconversion of HBoV1 ( 10 / 31 , 32 . 3 % ) , HBoV2 ( 8 / 31 , 25 . 8 % ) , and HBoV3 ( 2 / 31 , 6 . 5 % ) was found in paired sera collected from children with respiratory tract infections who were positive for HBoV1 according to PCR analysis .