This study hasn't been published in a peer-reviewed journal yet, but looking at their findings, it doesn't sound like they quite got this whole HPV vaccine thing down yet. Anyone want to venture a guess as to why vaccinated women would have a higher prevalence of other high-risk HPV strains?
Women who receive the human papillomavirus (HPV) vaccine may be more likely to be infected with certain high-risk strains of the virus than women who do not get the vaccine, according to a new study. The findings suggest that, although the vaccine is effective in protecting against four strains of HPV, women who received it may still benefit from getting another, recently approved HPV vaccine that protects against nine strains of the virus, the researchers said.
http://www.livescience.com/50563-hpv-vaccine-infections-prevalence.htmlWomen in the study who received the Gardasil vaccine were, indeed, less likely to be infected with the four strains of the virus included the vaccine: About 11 percent of vaccinated women were infected with HPV 6, 11, 16 or 18, compared with nearly 20 percent of unvaccinated women. However, the women who received the vaccine were more likely to be infected with other high-risk HPV strains not included in the vaccine. About 61 percent of the women who received the vaccine were infected with another type of high-risk HPV, compared with 40 percent of women who did not receive the vaccine. (HPV strains are considered "high risk" if they can cause cellular changes that can eventually lead to cancer.)