This is a follow-up study that is based on phase III clinical study of a recombinant human papillomavirus 16/18 bivalent vaccine in females aged 18-45 years (Unique Protocol ID: HPV-PRO-003, Identifiers: NCT01735006). The investigators will recruit people who have participated in phase III clinical study on Hebei Province before and to evaluate the durability of protection of the bivalent HPV vaccine on 90m and 114m after dose 1.
The primary objective of this study is to evaluate the durability of protection of Recombinant Human Papillomavirus Bivalent (Types 16,18) Vaccine administered in females aged 18-45 years.