What this means
The goal of this randomized controlled trial is to learn if text message reminders sent through WhatsApp increase pneumococcal vaccination coverage in adults turning 65 years old in Chile. The main questions it aims to answer are: Do text message reminders increase the proportion of adults aged 65 years who receive the pneumococcal vaccine compared to usual care?
A plain-English summary is on its way. Until then, this is the start of the registry's own summary.
- Status
- Enrolling by invitation
- Who can join
- Ages 64–65
- Where
- 1 site
The science
- Registered title
- Randomized Controlled Trial Of Text Messages To Increase Pneumococcal Vaccination In Adults In Chile.
- Trial ID
- NCT07659470 ↗
- Phase
- Not applicable
- Study type
- interventional
- Conditions
- Pneumococcal Infections, Immunization Programs, Vaccination Coverage, Text Messaging (Intervention), Reminder Systems, Health Promotion, Aged 65 Years or Older
- What is tested
- WhatsApp text message reminder for pneumococcal vaccination
- Sponsor
- Pablo Tomás Valenzuela García
- Ages
- 64 Years to 65 Years
- Dates
- First posted Jun 22, 2026 · updated Oct 22, 2026
Registry summary
The goal of this randomized controlled trial is to learn if text message reminders sent through WhatsApp increase pneumococcal vaccination coverage in adults turning 65 years old in Chile. The main questions it aims to answer are:
Do text message reminders increase the proportion of adults aged 65 years who receive the pneumococcal vaccine compared to usual care? Do text message reminders increase pneumococcal vaccination coverage within the first 7 days after the message is sent? Is there an association between socioeconomic factors and pneumococcal vaccination coverage in adults aged 65 years in Chile?
Researchers will compare adults who receive a text message reminder to adults who receive no reminder (usual care) to see if the reminders increase vaccination uptake.
Participants will:
Be randomly assigned to receive a WhatsApp text message reminder about the pneumococcal vaccine or to receive no reminder Receive a second reminder on day 14 if they have not yet been vaccinated (intervention group only) Be followed for 6 weeks, with vaccination status checked at days 7, 21, and 42 from the start of the intervention
Sites (1)
- National Immunization Program, Ministry of Health, Chile., Santiago, RM, Chile