cells consistent with what were at the time known as papovaviruses. (The group has since been divided into the papillomavirus and polyomavirus families.) In 2010, researchers used rolling circle amplification to recover viral DNA from TS lesions and thus discovered a novel polyomavirus, trichodysplasia spinulosa polyomavirus (TSPyV). There is compelling evidence that TSPyV is the direct causative agent of TS. References External links Virus-related cutaneous conditions Rare diseases Rare infectious diseases