Figure 6. Seroresponses to trichodysplasia spinulosa–associated polyomavirus (TSV) and BKV polyomavirus in healthy and immunocompromised populations, the Netherlands. Serum samples were obtained from 528 healthy persons (PrePIENTER) and 80 renal transplant recipients (RTR) and screened for reactivity against TSV viral protein 1 (VP1) (A) and BKV VP1 (B) by using the VP1 multiplex antibody-binding assay. Each circle represents 1 sample, and horizontal lines represent cutoff values. Percentage values indicate seropositivity. MFI, median fluorescent intensity.