More than a decade has passed since the Centers for Disease Control and Prevention (CDC) first recommended immunization against human papillomavirus (HPV), and yet despite significant promotion and awareness efforts, completion of the multi-dose series lags compared with other CDC-recommended vaccines.

When it comes to keeping up with vaccinations, “booster” doses—doses administered after a completed series for added protection—are sometimes skipped. The CDC recommends that after age 19, adults should receive a Tdap booster dose every 10 years, yet only one out of every five adults receives a Tdap booster.