Comparison of HPV16 serology assays at enrollment and protection against incident HPV16 DNA infections during four years of follow-up.

ELISA: VLP-based direct enzyme-linked immunosorbent assay; cLIA: Competitive Luminex immunoassay; SEAP-NA: Secreted alkaline phosphatase protein neutralization assay.aEnrollment serology based on laboratory-based standard seropositivity cutoffs: ELISA, 8 EU/mL; cLIA, 20 mMU/mL; SEAP-NA, 25.1.bSampling-adjusted population estimates (see methods).cBased on data from [14].