Longitudinal study of seroprevalence and serostability of 34 human papillomavirus types in European organ transplant recipients

► Eighty percent of OTRs seropositive to at least one HPV type at baseline. ► HPV-6 and HPV-4 had the highest baseline seroprevalence rates. ► Most OTRs retained their serostatus over time. ► HPV-6 had the highest change in serostability (21% changed serostatus). ► No significant changes in antibody status for any HPV type in the 18 months