Text message nudge could save thousands from pneumonia
NCT ID NCT07659470
First seen Jun 23, 2026 · Last updated Jun 23, 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.
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Contacts and locations
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Study contacts
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Contact
Phone: •••-•••-•••• Email: •••••@•••••
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Contact
Phone: •••-•••-•••• Email: •••••@•••••
Locations
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National Immunization Program, Ministry of Health, Chile.
Santiago, RM, 8320064, Chile
Contact
Contact Email: •••••@•••••
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Contact Email: •••••@•••••
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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.
Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.