Only 61 percent of U.S. 13-to-17-year-olds have been fully vaccinated against the human papillomavirus (HPV), according to research published last month by the Centers for Disease Control and Prevention. The finding was based on vaccination records of over 16,500 adolescents obtained via the 2023 National Immunization Survey-Teen. The goal was to determine rates for the four routine adolescent vaccines: for tetanus-diphtheria-pertussis (Tdap), meningitis (MenACWY), HPV and the flu.