Viruses with a Single-Stranded DNA Genome
Only a few human and animal pathogenic viruses are known that have a single-stranded DNA genome. The members of the family Parvoviridae have a linear genome, whereas the genome of the members of the family Circoviridae and that of the recently created family Anelloviridae have a circular structure. The members of the family Geminiviridae are also characterized by a circular, single-stranded DNA genome, but they infect only plants. Circoviruses are pathogens in both plants and various animal species (monkeys, swine, poultry, etc.). A circular, single-stranded DNA virus, torque teno virus, was first isolated from humans in 1997. Several types of torque teno virus have been detected and classified into the family Anelloviridae; all persist, like the later discovered torque teno mini viruses and the torque teno midi viruses, in most people and various animals without causing any apparent disease.
KeywordsInverted Terminal Repeat Torque Teno Virus Helper Virus Chicken Anaemia Virus Postweaning Multisystemic Wasting Syndrome
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