Dear Editor,Torque Teno virus(TTV)is a nonenveloped human DNA virus that was isolated from the serum of a patient with transfusion-transmitted hepatitis with unknown etiology in 1997(Nishizawa et al.,1997).TTV is the first human virus with a single-stranded circular DNA genome to be identified,and is recently classified as the Alphatorquevirus genus of the Anelloviridae family by the International Committee on Taxonomy of Viruses(ICTV)(King et al.,2011).TTV shows very high genetic Dear Editor, Torque Teno virus (TTV) is a nonenveloped human DNA virus that was isolated from the serum of a patient with transfusion-transmitted hepatitis with unknown etiology in 1997 (Nishizawa et al., 1997). TTV is the first human virus with a single-stranded circular DNA genome to be identified, and is recently classified as the Alphatorque virus genus of the Anelloviridae family by the International Committee on Taxonomy of Viruses (ICTV) (King et al., 2011) .TVTV shows very high genetic