The Durability of Protection and Immuno-persistence Study of a Recombinant HPV 16/18 Bivalent Vaccine in Female

The Durability of Protection and Immuno-persistence Study of A Bivalent Human Papillomavirus (Type 16, 18) Recombinant Vaccine (E.Coli) in Healthy Women Aged 18 to 45 Years

The primary objective of this study is to evaluate the durability of protection and immuno-persistence of Recombinant Human Papillomavirus Bivalent (Types 16,18) Vaccine administered in females aged 18-45 years.

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 before and to evaluate the durability of protection and immuno-persistence of the bivalent HPV vaccine on 90m and 114m after dose 1.

Inclusion Criteria:

1. Participants who participated in the Phase III clinical study of a recombinant human papillomavirus 16/18 bivalent vaccine in females (Unique Protocol ID: HPV-PRO-003, Identifiers: NCT01735006) and received at least one dose;
2. Participants can fully understand the study content and sign an informed consent form；
3. Able to comply with the requests of the study;

Exclusion Criteria:

1. Participants used other HPV vaccine products (including both marketed and unmarketed vaccines) since participating in the Phase III clinical study.
2. According to the investigator's judgment, there might be some medical, psychological, social or occupational factors which might impact on the individual to obey the protocol or sign the informed consent;