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Modified HPV L1 VLP ELISA avidity assay using chaotropic elution for HPV-16 (C) and HPV-18 (D). Arrows indicate time of first (month 0), second (Cervarix® month 1, Gardasil® month 2), and third (month 6) vaccinations with respect to time points. *P < 0.05 (Mann-Whitney). Data expressed as Geometric Mean of Avidity Indices (95% CI).
