2 recently completed phase III trials in Finland indicated that "protective HPV vaccine-induced antibody titres" can be detected as long as 12 years after the HPV vaccine is first administered. The Finish studies determined that 51 (15%) of the 339 quadrivalent vaccine recipients had "no detectable HPV18 neutralizing antibodies 2 to 12 years after vaccination."
To read more about this study, click here.
Source mentioned: Colaҫo Mariz F, Gray P, Bender N, et al. Sustainability of neutralising antibodies induced by bivalent or quadrivalent HPV vaccines and correlation with efficacy: a combined follow-up analysis of data from two randomised, double-blind, multicentre, phase 3 trials. The Lancet Infectious Diseases; Published online 31 May 2021; DOI: https://doi.org/10.1016/S1473-3099(20)30873-2
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