No evidence for cross-protection of the HPV-16/18 vaccine against HPV-6/11 positivity in female STI clinic visitors

J Infect. 2017 Apr;74(4):393-400. doi: 10.1016/j.jinf.2017.01.007. Epub 2017 Jan 23.

Abstract

Objectives: Data from a vaccine trial and from post-vaccine surveillance in the United Kingdom have suggested that the bivalent HPV-16/18 vaccine offers cross-protection against HPV-6/11 and protection against anogenital warts (AGW). We studied the effect of the bivalent vaccine on genital HPV-6/11 positivity and AGW in the Netherlands.

Methods: We included all vaccine-eligible women from the PASSYON study, a biennial cross-sectional study among 16- to 24-year-old sexually transmitted infection (STI) clinic attendants. Vaginal self-swabs were analyzed for type specific HPV and AGW were diagnosed at the STI-clinic. Prevalence of HPV-6 and/or HPV-11 and AGW were compared between self-reported vaccinated and unvaccinated women by log-binomial regression analysis, adjusted for demographics and risk behavior.

Results: Of the 1198 women included, 56% reported to be vaccinated at least once. Relative to unvaccinated women, the adjusted prevalence ratio (PR) for HPV-6/11 was 1.03 (95% confidence interval [CI] 0.74-1.43) for women vaccinated at least once. The crude PR for AGW was 0.67 (95% CI 0.22-2.07) for women vaccinated at least once. Adjustment did not change these results.

Conclusions: We observed no cross-protective effect of the bivalent vaccine on genital HPV-6/11 positivity and a non-significant partially protective effect on AGW.

Keywords: Condylomata acuminata; Human papillomavirus 11; Human papillomavirus 6; Human papillomavirus vaccine, L1 type 16, 18; Prevention & control; Vaccination; Warts.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Ambulatory Care Facilities
  • Condylomata Acuminata / prevention & control*
  • Condylomata Acuminata / virology
  • Cross Protection*
  • Cross-Sectional Studies
  • Female
  • Human papillomavirus 11 / immunology*
  • Human papillomavirus 16 / immunology
  • Human papillomavirus 18 / immunology*
  • Human papillomavirus 6 / immunology
  • Humans
  • Netherlands / epidemiology
  • Papillomavirus Infections / epidemiology
  • Papillomavirus Infections / immunology
  • Papillomavirus Infections / prevention & control*
  • Papillomavirus Infections / virology
  • Papillomavirus Vaccines / immunology*
  • Prevalence
  • Sexually Transmitted Diseases / prevention & control
  • United Kingdom / epidemiology
  • Uterine Cervical Neoplasms / prevention & control
  • Vagina / virology
  • Young Adult

Substances

  • Papillomavirus Vaccines
  • human papillomavirus vaccine, L1 type 16, 18