Evaluating a Behavioral Insights–Informed Social Media Campaign to Increase HPV Vaccination During Routine Immunization in Nigeria

: A behavioral insights-informed social media campaign in which pharmacists served as influencers was associated with higher HPV vaccine uptake during routine immunization. The higher rate of vaccination observed in intervention areas was associated with higher rates of caregiver motivation and ability but not with higher rates of caregiver knowledge. These findings are consistent with the potential of behavioral insights-informed digital campaigns to complement routine immunization efforts and improve vaccine uptake in low- and middle-income countries.