Behavior ChangeNCT07687719
Chatbot-delivered Theory-based Online Intervention in Increasing Seasonal Influenza Vaccination Uptake Among Children Aged 3-6 Years
A study testing Stage-of-change-tailored intervention and Non-stage-of-change-tailored intervention in people with Behavior Change, run by Chinese University of Hong Kong.
Trial summary
This randomized controlled trial will compare the efficacy of a Chatbot-delivered stage-of-change-tailored online intervention versus a Chatbot-delivered non-stage-of-change-tailored online intervention for mothers in increasing seasonal influenza vaccination uptake of their children aged 3-6 years. Read more about this study
- Who is it for?
- Ages 18 years and older, women onlyHealthy volunteers can take part
- Conditions the study is for
- Behavior Change
- What is being tested?
- Stage-of-change-tailored intervention and Non-stage-of-change-tailored intervention
- Type of treatment
- Vaccines, Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 426 participants
- Where
- No sites listed yet
- Study dates
- 1 Aug 2026to 31 Oct 2027
- Phase
- Interventional
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- Women only
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- Mothers aged ≥18 years with at least one child aged 3-6 years studying in kindergarten in Hong Kong
- Cantonese speaking
- Having smartphone with internet access
- Already having WhatsApp on the smartphone
Who cannot join
- Blindness or deafness
- The index child has known medical contraindications for seasonal influenza vaccination
Trial locations and contacts
No sites are listed yet. Contact the study team or a site near you to ask about taking part.
About this study
Official title: A Randomized Controlled Trial Evaluating a Chatbot-delivered Theory-based Online Intervention in Increasing Seasonal Influenza Vaccination Uptake Among Children Aged 3-6 Years
This randomized controlled trial will compare the efficacy of a Chatbot-delivered stage-of-change-tailored online intervention versus a Chatbot-delivered non-stage-of-change-tailored online intervention for mothers in increasing seasonal influenza vaccination uptake of their children aged 3-6 years. Mothers of children aged 3-6 years will be randomized evenly into either the intervention or the control group.
In the intervention group, the Chatbot will assess mothers' stage of change regarding their children's seasonal influenza vaccination uptake and deliver SOC-tailored interventions through WhatsApp every two weeks for four times.
Read more
In the control group, the Chatbot will provide a standard and non-stage-of-change-tailored intervention every two weeks for four times.
All participants will complete three telephone surveys at baseline (T0), after completion of the intervention (T1) and three months after T1 (T2).
- Conditions
- Behavior Change
- Being tested
- Stage-of-change-tailored intervention, Non-stage-of-change-tailored intervention
- Keywords
- Seasonal influenza vaccination uptake
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Stage-of-change-tailored interventionBehavioural
The Chatbot will deliver four intervention sessions tailored to participants' current stage of change regarding their index child's seasonal influenza vaccination uptake at Week 0, 2, 4, and 6. Participants will also have access to real-time Question-and-Answer (QA) function provided by the chatbot to address their questions related to seasonal influenza vaccination during the intervention period (week 0-6), and they are free to spend as much time as they want on such function.
Non-stage-of-change-tailored interventionBehavioural
The Chatbot will automatically send participants a link to access a standard online video at week 0, 2, 4 and 6. Participants will also have access to real-time Question-and-Answer (QA) function provided by the chatbot to address their questions related to seasonal influenza vaccination during the intervention period (week 0-6), and they are free to spend as much time as they want on such function.
| Study group | Role | What they receive |
|---|---|---|
| Intervention group | Experimental | Participants in the intervention group will receive chatbot-delivered online interventions tailored to their current stage of change regarding their index child's seasonal influenza vaccination. Receives: Behavioral: Stage-of-change-tailored intervention |
| Control group | Active comparator | Participants in the control group will receive chatbot-delivered standard and non-stage-of-change-tailored interventions Receives: Behavioral: Non-stage-of-change-tailored intervention |
What is being measured
The primary outcome is the main question the study is designed to answer.
Index child's seasonal influenza vaccination uptake reported by his/her mother with validation
The research team will ask the participants whether their index children have taken up seasonal influenza vaccination at T2 (3 months after completion of the interventions) using a validated question through telephone interview. The research team will validate the outcome by requesting participants uploading an image of SIV receipt, while hiding personal identification, via the WhatsApp account used in this project.
Measured: 3 months after completion of the interventions (T2)
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted7 Jul 2026
- Study start1 Aug 2026 (estimated)
- Primary completion31 Oct 2027 (estimated)
- Study completion31 Oct 2027 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Behavior ChangeStudies of the same condition, open and under way.
- More trials run by Chinese University of Hong KongThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Health services research
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind
- Who is masked
- Outcomes assessor
- Enrolment
- 426 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Chinese University of Hong Kong
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Zixin Wang, Chinese University of Hong Kong
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07687719
- Sponsor's protocol ID
- HMRF24230092
- Status last verified
- Jun 2026
- First submitted
- 30 Jun 2026
- Last updated
- 7 Jul 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 7 Jul 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Randomized Controlled Trial Evaluating a Chatbot-delivered Theory-based Online Intervention in Increasing Seasonal Influenza Vaccination Uptake Among Children Aged 3-6 Years
- ClinicalTrials.gov ID
- NCT07687719
- Acronym / sponsor ID
- HMRF24230092
- Conditions
- Behavior Change
- Keywords
- Seasonal influenza vaccination uptake
- Study type
- Interventional
- Recruitment status
- Not yet recruiting
- Enrolment
- 426 participants (estimated)
- Lead sponsor
- Chinese University of Hong KongUniversity, hospital or other
- Study start
- 1 Aug 2026 (estimated)
- Primary completion
- 31 Oct 2027 (estimated)
- Study completion
- 31 Oct 2027 (estimated)
- First posted
- 7 Jul 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This randomized controlled trial will compare the efficacy of a Chatbot-delivered stage-of-change-tailored online intervention versus a Chatbot-delivered non-stage-of-change-tailored online intervention for mothers in increasing seasonal influenza vaccination uptake of their children aged 3-6 years. Mothers of children aged 3-6 years will be randomized evenly into either the intervention or the control group.
In the intervention group, the Chatbot will assess mothers' stage of change regarding their children's seasonal influenza vaccination uptake and deliver SOC-tailored interventions through WhatsApp every two weeks for four times.
In the control group, the Chatbot will provide a standard and non-stage-of-change-tailored intervention every two weeks for four times.
All participants will complete three telephone surveys at baseline (T0), after completion of the intervention (T1) and three months after T1 (T2).
Study design
- Primary purpose
- Health services research
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind (outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Intervention group | Experimental | Behavioral: Stage-of-change-tailored interventionParticipants in the intervention group will receive chatbot-delivered online interventions tailored to their current stage of change regarding their index child's seasonal influenza vaccination. |
| Control group | Active comparator | Behavioral: Non-stage-of-change-tailored interventionParticipants in the control group will receive chatbot-delivered standard and non-stage-of-change-tailored interventions |
Who may qualify
- Ages
- 18 years and older
- Sex
- Female only
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (4 listed)
- Mothers aged ≥18 years with at least one child aged 3-6 years studying in kindergarten in Hong Kong
- Cantonese speaking
- Having smartphone with internet access
- Already having WhatsApp on the smartphone
Key exclusion criteria (2 listed)
- Blindness or deafness
- The index child has known medical contraindications for seasonal influenza vaccination
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Stage-of-change-tailored interventionThe Chatbot will deliver four intervention sessions tailored to participants' current stage of change regarding their index child's seasonal influenza vaccination uptake at Week 0, 2, 4, and 6. Participants will also have access to real-time Question-and-Answer (QA) function provided by the chatbot to address their questions related to seasonal influenza vaccination during the intervention period (week 0-6), and they are free to spend as much time as they want on such function. | Behavioural | Intervention group |
| Non-stage-of-change-tailored interventionThe Chatbot will automatically send participants a link to access a standard online video at week 0, 2, 4 and 6. Participants will also have access to real-time Question-and-Answer (QA) function provided by the chatbot to address their questions related to seasonal influenza vaccination during the intervention period (week 0-6), and they are free to spend as much time as they want on such function. | Behavioural | Control group |
Primary outcome
Index child's seasonal influenza vaccination uptake reported by his/her mother with validation
Time frame: 3 months after completion of the interventions (T2)
The research team will ask the participants whether their index children have taken up seasonal influenza vaccination at T2 (3 months after completion of the interventions) using a validated question through telephone interview. The research team will validate the outcome by requesting participants uploading an image of SIV receipt, while hiding personal identification, via the WhatsApp account used in this project.
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 7 Jul 2026.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Questions about this trial
What is this clinical trial studying?
A study testing Stage-of-change-tailored intervention and Non-stage-of-change-tailored intervention in people with Behavior Change, run by Chinese University of Hong Kong.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 2 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: opening soon, as of the sponsor's last update on 7 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Zixin Wang, PhD (+852 22528474, wangzx@cuhk.edu.hk), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Index child's seasonal influenza vaccination uptake reported by his/her mother with validation (time frame: 3 months after completion of the interventions (T2)). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 7 Jul 2026.