Seroprevalence of trichodysplasia spinulosa-associated polyomavirus in Japan

Background: Trichodysplasia spinulosa-associated polyomavirus (TSV) was identified in, and shown to be the probable cause of, trichodysplasia spinulosa, a rare skin disease. To date, serological analyses have revealed that TSV infection is common among adults in the general population of Europe and Australia. However, there have been no reports of TSV in Asia. Objective: To study the prevalence of TSV infection in Japan. Study design: TSV-VP1 expressed in a recombinant baculovirus expression system in an insect cell line, Tn5, self-assembled into virus-like particles. Overall, 1000 serum samples were examined by enzyme-linked immunosorbent assays using virus-like particles of TSV as antigen. Participants ranged in age from 0 to 94 years. Results: Overall, 629 of 1000 serum samples (62.9%) were positive for anti-TSV antibodies. The seropositive rate increased with age and the seroprevalence of TSV significantly increased from 17.1% (25/146) in children aged from 0 to 4 years to 78.7% (472/600) in adults aged over 20 years (odds ratio = 0.056,95% confidence interval = 0.035-0.900, P = 0.000, Chi-squared test). TSV seropositivity was not different between sera obtained in 1980 and 2012, and was not associated with sex. Competitive assay demonstrated that TSV antibodies did not cross-react with BK virus or Merkel cell polyomavirus. Conclusions: These results provide evidence that TSV circulates widely in the Japanese population, with primary exposure occurring mainly at early childhood, similar to that previously reported in other countries. (C) 2015 Elsevier B.V. All rights reserved.