Young women getting suggested vaccinations to prevent human papillomavirus (HPV) infection and related cancers do not engage in more sexually risky behaviour, finds a new study.
According to the study conducted by Centers for Disease Control and Prevention, HPV is the most common sexually transmitted disease in the U.S. with an estimated 6.2 million new infections annually.
The disease is linked to various cancers, including cervical and oral.
Nicole C. Liddon and her team of researchers obtained data from more than 1,200 women ages 15 to 24 years, interviewed as part of the National Survey of Family Growth (NSFG), including demographic and insurance information as well as specific information about sexual education and behaviours and receipt of the HPV vaccine.
Age at vaccination was not available, making it uncertain whether HPV vaccination came before or after the start of sexual behaviours.
"Because of perceived risk that young women would behave recklessly, parents, providers, policy-makers and other STD opponents raised concerns when the FDA first licensed and approved the HPV vaccine in 2006," Liddon said.
"It was clear that we needed to determine whether a relationship existed between being vaccinated against a sexually-transmitted disease and sexual behaviour," she said.
The researchers found no differences in sexual experience between the vaccinated and unvaccinated groups. Interestingly, among sexually active young women ages 15 to 19, those who had received the vaccine were more likely to report always using a condom in the past four weeks than those who had not received the vaccine.
Liddon and her colleagues also identified several health disparities, including the fact that young women with health insurance were more likely to receive the first dose of three recommended vaccinations than uninsured young women were. Additionally, women younger than 19 were nearly twice as likely to receive the vaccine as older women were.
"The study helps us answer a question that has captured the imagination of millions of Americans: Does HPV vaccine cause teen girls to have sex earlier or more often?" Noel T. Brewer, associate professor of the department of health behaviour and health education at the University of North Carolina, Chapel Hill.
"Liddon and her colleagues clearly show that the vaccine does not promote sexual disinhibition.
These data are only a preliminary answer to the question as they are from a cross-sectional study of girls' and women's self-reports of vaccination. However, the study offers us some of the only data on how HPV vaccine affects behaviour," Brewer said.
The study has been published in the American Journal of Preventive Medicine.