Vaccination against the Human Papillomavirus: the lessons we have not learned

Knowledge, perceptions, and motivations related to HPV vaccination among college women

Little research exists on the factors that affect the uptake patterns of the recently developed Gardasil® vaccine among young women. Human papillomavirus (HPV)-related knowledge, attitudes, beliefs, and behaviors of 18-24-year-old female students (n = 1,975) were assessed via an electronic survey. Mean HPV knowledge score, on a 10-point scale, was 6.8. A weak positive correlation (r (1,976) = 0.123, p < 0.001) was found between knowledge score and having received the vaccine. Parent recommendation, doctor recommendation, and perceiving the consequences of HPV as severe and prevalent were strongly related to previous vaccination. Data suggest a need for increased education about the vaccine and the importance of physician recommendation in increasing vaccine uptake.

Examining future adolescent human papillomavirus vaccine uptake, with and without a school mandate

PURPOSE

To develop a model of adolescent (HPV) human papillomavirus vaccine utilization that explored future HPV vaccination rates, with and without a school mandate, for the vaccine at middle school entry.

METHODS

A dynamic, population-based, compartmental model was developed that estimated over a 50-year time horizon HPV vaccine uptake among female adolescents living in the United States. The model incorporated data on parental attitudes about this vaccine and adolescent health care utilization levels.

RESULTS

Without a mandate, our model predicted that 70% coverage, a lower threshold value used in many previous modeling studies of HPV vaccination, would not be achieved until a mean of 23 years after vaccine availability. Maximal coverage of 79% was achieved after 50 years. With a school mandate in place, utilization increased substantially, with 70% vaccination coverage achieved by year 8 and maximal vaccination coverage, 90%, achieved by year 43.

CONCLUSIONS

Our results suggest that vaccine utilization is likely to be low for several years, though strong school mandates might improve HPV vaccine uptake. These results affect the interpretation of previous modeling studies that estimated the potential clinical effects of HPV vaccination under assumptions of very high vaccine utilization rates.