LAUSR

BACKGROUND Sexual minority women (lesbian, bisexual, and other women who have sex with women) are at risk for human papillomavirus (HPV) infection and HPV-related disease, demonstrating the importance of HPV vaccination for these women. METHODS We conducted an online survey of sexual minority women ages 18-45 from the United States (n = 505) in October 2019, about two months after HPV vaccine recommendations were expanded to include ages 27-45. Multivariable Poisson regression identified correlates of HPV vaccine initiation (i.e., receipt of at least one HPV vaccine dose). RESULTS Overall, 65% of participants ages 18-26 and 33% of participants ages 27-45 had initiated the HPV vaccine series. Among participants ages 18-26, initiation was more common among those who had received a healthcare provider recommendation (RR = 2.19, 95% CI: 1.64-2.93) or had disclosed their sexual orientation to their primary healthcare provider (RR = 1.33, 95% CI: 1.07-1.65). Among initiators ages 27-45, a large majority (89%) reported receiving their first dose before turning age 27. Initiation was more common among participants ages 27-45 who had received a healthcare provider recommendation (RR = 3.23, 95% CI: 2.31-4.53) or who reported greater perceived social support for HPV vaccination (RR = 1.22, 95% CI: 1.05-1.40). Several reasons for not yet getting HPV vaccine differed by age group (ages 18-26 vs. ages 27-45; all p < 0.05). CONCLUSIONS Many sexual minority women, particularly those ages 27-45, remain unvaccinated against HPV. Findings provide early insight into HPV vaccine coverage among adult women and highlight key leverage points for increasing vaccination among this population.