Eleven years ago the circular DNA of a novel single-stranded
virus has been cloned and partially characterized by Nishizawa and
Okamoto and their colleagues. According to the initials of the
patient from whom the isolate originated, the virus was named TT
virus. This name has been subsequently changed by the International
Committee on Taxonomy of Viruses (ICTV) into Torque teno virus,
permitting the further use of the abbreviation TTV. Although
initially suspected to play a role in non A E hepatitis, subsequent
studies failed to support this notion.
Within a remarkably short period of time it became clear that TT
viruses are widely spread globally, infect a large proportion of
all human populations studied thus far and represent an extremely
heterogeneous group of viruses, now labelled as Anelloviruses. TT
virus-like infections have also been noted in various animal
species. The classification of this virus group turns out to be
difficult, their DNA contains between 2200 and 3800 nucleotides,
related so-called TT-mini-viruses and a substantial proportion of
intragenomic recombinants further complicate attempts to combine
these viruses into a unifying phylogenetic concept. "
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