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J Infect Dis. 2013 Nov 1;208(9):1397-403. doi: 10.1093/infdis/jit361.

Declining genital Warts in young women in england associated with HPV 16/18 vaccination: an ecological study.

Author information

1
HIV/STI Department, Public Health England.

Abstract

BACKGROUND:

Diagnoses of genital warts (GW) in genitourinary medicine (GUM) clinics have been increasing in England for many years. In 2008, an HPV immunization program began with a bivalent vaccine (Cervarix). This was expected to markedly reduce infections and disease due to human papillomavirus (HPV) 16/18 but not HPV 6/11 infections or disease. However, from 2009 to 2011 there were decreases in reported diagnoses of GW in young females at GUM clinics.

METHODS:

Using data from GUM clinics and a sample of general practices (GPs) throughout England, we analyzed rates of GW diagnoses by age, year of diagnosis, and estimated immunization coverage.

RESULTS:

The overall reduction in GW diagnoses at GUM clinics between 2008 and 2011 was 13.3% among 16- to 19-year-old females, with the greatest decline of 20.8% in 17-year-olds. Declines were positively associated with estimated immunization coverage. A similar pattern was seen in GP diagnoses, but not among older women, and for other GUM consultations.

CONCLUSIONS:

Several factors might contribute to declines in GW. However, the size and pattern of the declines strongly suggest that we are observing an unexpected, moderately protective effect of HPV 16/18 vaccination against GW.

TRIAL REGISTRATION:

ClinicalTrials.gov NCT00122681.

KEYWORDS:

Cervarix; HPV immunization; genital warts; surveillance

PMID:
24092908
PMCID:
PMC3789575
DOI:
10.1093/infdis/jit361
[Indexed for MEDLINE]
Free PMC Article
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