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. 2014 Sep 11;122(1):107–118. doi: 10.1111/1471-0528.13070

Figure 4.

Figure 4

Correlation of ratio between cervicovaginal secretion and serum samples by age for anti-HPV–16 (A) and anti-HPV–18 (B) antibody levels at year 6 in women aged 15–55 years (total vaccinated cohort). Key: [15–25], women aged 15–25 years at the time of first vaccine dose; [26–45], women aged 26–45 years at the time of first vaccine dose; [46–55], women aged 46–55 years at the time of first vaccine dose; CVS, cervicovaginal secretion; R, correlation coefficient. Titres were measured using an ELISA assay for the detection of anti-HPV–16 and anti-HPV–18 antibodies both for cervicovaginal secretion and serum samples. The scatter plots show the ratio (specific IgG/total IgG) transformed to linear log10 values.