Text message nudge could save thousands from pneumonia

NCT ID NCT07659470

Not yet recruiting Prevention Sponsor: Pablo Tomás Valenzuela García Source: ClinicalTrials.gov ↗

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study tests whether a simple WhatsApp message reminding people turning 65 in Chile to get their free pneumococcal vaccine can increase vaccination rates. Over 43,000 adults will be randomly assigned to receive the reminder or not, and researchers will track who gets vaccinated within 42 days. If successful, this low-cost approach could be used to boost vaccine coverage in other populations.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance: WhatsApp text message reminder
What this could lead to: If it works, this could show that simple text reminders are a cheap, effective way to get more older adults vaccinated against pneumonia.
What could go wrong: This is a behavioral study, not a drug trial. The effect may be small, and results from Chile may not apply to other countries or age groups.

This is an AI summary of the original study and may miss details. Read our disclaimer.

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Conditions

The condition(s) this trial relates to.

pneumococcal infection prevention target

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

AGED 65 YEARS OR OLDER HEALTH PROMOTION IMMUNIZATION PROGRAMS PNEUMOCOCCAL INFECTIONS REMINDER SYSTEMS TEXT MESSAGING (INTERVENTION) VACCINATION COVERAGE

Contacts and locations

Locations

National Immunization Program, Ministry of Health, Chile.

Santiago, RM, 8320064, Chile

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