Objectives To estimate the prevalence of, and describe risk factors for, genital warts (GWs) in the British population, following the introduction of the bivalent (human papillomavirus (HPV)-16/18) vaccination programme in girls, and prior to the switch to quadrivalent (HPV-6/11/16/18) vaccine (offering direct protection against GWs) and compare this with GW diagnoses in the prevaccination era. Methods Natsal-3, a probability sample survey in Britain, conducted in 2010-2012, interviewed 9902 men and women aged 16-44. Natsal-2, conducted in 1999-2001, surveyed 11 161 men and women aged 16-44. Both surveys collected data on sexual behaviour and sexually transmitted infection diagnoses using computer-assisted interview methods. Results In Natsal-3, 3.8% and 4.6% of sexually experienced men and women reported ever having a diagnosis of GWs, with 1.3% of men and 1.7% of woman reporting a GWs diagnosis in the past 5 years. GWs were strongly associated with increasing partner numbers and condomless sex. Diagnoses were more frequent in men who have sex with men (MSM) (11.6% ever, 3.3% past 5 years) and in women reporting sex with women (10.8% ever, 3.6% past 5 years). In the age group who were eligible for vaccination at the time of Natsal-3 (16-20 years), a similar proportion of same-aged women reported a history of GWs in Natsal-2 (1.9%, 1.1-3.4) and Natsal-3 (2.6%, 1.5-4.4). Conclusions These data provide essential parameters for mathematical models that inform cost-effectiveness analyses of HPV vaccination programmes. There was no evidence of population protection against GWs conferred by the bivalent vaccine. Even with vaccination of adolescent boys, vaccination should be offered to MSM attending sexual health clinics.
|Number of pages||5|
|Journal||Sexually Transmitted Infections|
|Publication status||Published - 1 Aug 2019|
Bibliographical noteFunding Information:
Funding natsal-3 is a collaboration between University college london, london School of Hygiene and tropical Medicine, national centre for Social research, Public Health england and the University of Manchester. the study was supported by grants from the Medical research council (g0701757) and the Wellcome trust (084840), with contributions from the economic and Social research council and Department of Health.
Natsal-3 is a collaboration between University College London, London School of Hygiene and Tropical Medicine, National Centre for Social Research, Public Health England and the University of Manchester. The study was supported by grants from the Medical Research Council (G0701757) and the Wellcome Trust (084840), with contributions from the Economic and Social Research Council and Department of Health. We thank the study participants, the team of interviewers from NatCen Social Research and operations and computing staff from NatCen Social Research.
- genital warts
- probability sample survey