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When human papillomavirus (HPV) vaccine was first licensed, there was concern that vaccinating young girls could lead to increases in risky sexual behaviors. Investigators used data from Kaiser Permanente in metropolitan Atlanta to look for evidence of this phenomenon. They compared testing and diagnosis rates for chlamydia, pregnancy, and other sexually transmitted infections and contraceptive counseling rates between 493 eleven to twelve-year-old girls who received at least one dose of HPV vaccine and 905 same-aged girls who received only tetanus, diphtheria, pertussis (Tdap) or meningococcal (MCV4) vaccines.
During 3 years of follow-up in analysis controlled for baseline health-seeking behavior, no differences were found between the two g…