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Why do chatbots work? A randomized controlled trial to test the effect of behaviorally-informed chatbot functionalities on vaccine uptake

Why do chatbots work? A randomized controlled trial to test the effect of behaviorally-informed chatbot functionalities on vaccine uptake

Status
Recruiting
Phases
Unknown
Study type
Interventional
Source
ISRCTN
Registry ID
ISRCTN14701620
Enrollment
295155
Registered
2024-06-13
Start date
2024-08-07
Completion date
Unknown
Last updated
2024-08-19

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Promotion of COVID-19 and influenza vaccination in the general population Infections and Infestations

Interventions

The unit of randomisation is the individual as identified by an anonymized ID called 'patient ID'. Using a random number generator, the researchers assigned participants to one of four groups. Partic

Sponsors

The Behavioural Insights Team
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: Current participant inclusion criteria as of 05/08/2024: 1. Is 18 years of age or older 2. Is a resident of the province of Tucuman 3. Is eligible to receive their next COVID-19 dose or a government-subsidized flu vaccine: 3.1. COVID-19 vaccine eligibility criteria: 3.1.1. Individual is between 18 and 49 years old and is eligible for their booster shot based on time since last dose, i.e. has not had a COVID-19 shot in the last 12 months 3.1.2. Individual is 50 years old or older or has health risk factors and has not had a COVID-19 shot in the last 6 months 3.2. Government-subsidized flu vaccine eligibility criteria: 3.2.1. Citizens who are 65 years old or above 3.2.2. Citizens with a health risk factor 3.2.3. Health/security personnel 3.2.4. Citizens who had a medical prescription to receive the flu vaccine before 4. Mobile number is unique to one individual within the database 5. Mobile number has a valid format in Argentina 6. The user has an active WhatsApp account Previous participant inclusion criteria: 1. Is 18 years of age or older 2. Is a resident of the province of Tucuman 3. Is eligible to receive their next COVID-19 dose or a government-subsidized flu vaccine: 3.1. COVID-19 vaccine eligibility criteria: 3.1.1. Individual is between 18 and 49 years old and is eligible for their booster shot based on time since last dose, i.e. has not had a COVID-19 shot in the last 12 months 3.1.2. Individual is 50 years old or older or has health risk factors and has not had a COVID-19 shot in the last 6 months 3.2. Government-subsidized flu vaccine eligibility criteria: 3.2.1. Citizens who are 65 years old or above 3.2.2. Citizens with a health risk factor 3.2.3. Health/security personnel 3.2.4. Citizens who had a medical prescription to receive the flu vaccine before 4. Mobile number is unique to one individual within the database 5. Mobile number has a valid format in Argentina

Exclusion criteria

Exclusion criteria: Does not meet the inclusion criteria

Design outcomes

Primary

MeasureTime frame
'Next dose’ COVID-19 or Flu Vaccination Rate, a binary indicator of whether the individual receives a vaccination within 4 weeks of the assigned data for the sending of the initial message (COVID-19 or flu) (1 if they do, 0 if not)

Secondary

MeasureTime frame
Effect of chatbot functionalities on ‘Next dose’ COVID-19 or flu vaccination rate, a binary indicator of whether the individual receives a vaccination within 4 weeks of the assigned data for the sending of the initial message (COVID-19 or flu) (1 if they do, 0 if not)

Countries

Argentina

Contacts

Public ContactAdelaida Barrera
adelaida.barrera@bi.team-

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Feb 4, 2026