Chatbot-delivered Theory-based Online Intervention in Increasing Seasonal Influenza Vaccination Uptake Among Children Aged 3-6 Years

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.

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).

Inclusion Criteria:

• 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

Exclusion Criteria:

• Blindness or deafness
• The index child has known medical contraindications for seasonal influenza vaccination