Text4Health: impact of text message reminder-recalls for pediatric and adolescent immunizations

Area of Science:

• Public Health
• Preventive Medicine
• Health Communication

Background:

• Low immunization coverage is a persistent challenge in urban, low-income populations.
• Adolescent immunizations, such as meningococcal (MCV4) and tetanus-diphtheria-acellular pertussis (Tdap), are critical for public health.
• Traditional reminder systems may have limited reach in certain demographics.

Purpose of the Study:

• To evaluate the effectiveness of text message (SMS) reminders for improving immunization rates among adolescents.
• To assess the impact of SMS reminders on attendance at immunization recall sessions.

Main Methods:

• Two studies were conducted in an urban, low-income setting.
• Study 1: Randomized controlled trial comparing SMS reminders versus no reminders for MCV4 and Tdap vaccines in adolescents aged 11-18.
• Study 2: Compared attendance for Haemophilus influenzae B (Hib) immunization recall sessions between parents receiving SMS and paper reminders versus paper reminders only.

Main Results:

• Adolescents whose parents received SMS reminders showed significantly higher rates of MCV4 and Tdap vaccination at 4, 12, and 24 weeks.
• Parents receiving both SMS and paper reminders for Hib immunization had significantly higher attendance at recall sessions compared to those receiving only paper reminders.
• SMS reminders demonstrated significant effectiveness across both studies, even after controlling for demographic factors.

Conclusions:

• Text message reminder-recalls are an effective strategy to increase immunization coverage in urban, low-income populations.
• SMS-based interventions represent a scalable and impactful tool for public health initiatives.
• Targeted mobile health interventions can overcome barriers to vaccination in underserved communities.