Flow chart of eligible samples.

<p>Flow chart of eligible samples.</p

Definition of natural infection and vaccine-induced seropositivity.

<p>Abbreviations: EU/mL = ELISA units per millilitre per mililitre; GMC = Geometric mean concentration.</p

Seropositivity for HPV16 and 18 by clinical setting and laboratory sending specimens

<p>Seropositivity for HPV16 and 18 by clinical setting and laboratory sending specimens</p

Geometric mean concentrations (GMCs) for HPV type 16 and 18 among those with probable vaccine-induced seropositivity.

<p>Stratified by age at HPV vaccination and time since vaccination. Restricted to women with a known date of birth (n = 564). GMC for probable natural infection: 71 EU/mL for type 16; 36 EU/mL for type 18. Time from 1^st September in year first offered the HPV vaccine as part of the national immunisation programme to the date serology specimen was taken. Abbreviations: EU/mL = ELISA units per millilitre per millilitre</p