1[2]Leary TP, Erker JC, Chalmers ML, et al. Improved detection systems for TT virus reveal high prevalence in humans, non human primates and farmanimals[J]. J Gen virol,1999; 80∶2115-2120.
2[3]Prescott LE, Mac Donald DM, Davidson F, et al. Sequence diversity of TT virus in geographically dispersed human populations[J]. J Gen Virol,1999, 80∶1751-1758.
3[4]Takahashi K, Hoshino H, Ohta Y, et al. Very high prevalence of TT virus(TTV) in fection ingeneral population of Japan revealed by anewset of PCR primers[J]. Hepatol Res, 1998, 12:∶233-239.