The importance of social norms for uptake of catch-up human papillomavirus vaccination in young women.

Background: Human papillomavirus (HPV) is the cause of almost all cases of cervical cancer. The current UK government immunisation program includes free routine HPV vaccination of girls aged 12-13, with a catch-up vaccination program for 13-18-year-old girls. The aim of this study was to identify correlates of intended and actual uptake of catch-up HPV vaccination.