Comparing the Use of a Mobile App for Surveillance of Adverse Events Following Influenza Immunization to a Web-Based Platform

Not Applicable

Completed

• Conditions: Mobile Apps; Immunization; Adverse Event Following Immunisation
• Interventions: Device: Mobile app - CanImmunize; Device: Web based notification

• Registration Number: NCT05794113
• Lead Sponsor: The Ottawa Hospital

Brief Summary

Methods Study Procedures A two-centred randomized control trial (RCT) was conducted to evaluate the use of safety reporting via a mobile app compared to safety reporting via web-based CANVAS notifications amongst individuals receiving the influenza vaccine from October 6 to November 29, 2020 during the seasonal influenza vaccine campaign in Ottawa and Vancouver, Canada.

Individuals were recruited at the time of receiving their influenza vaccine. Eligibility criteria included the ability to speak English or French, having an active email address and telephone number, and being immunized with the seasonal influenza vaccine.

Randomization After study enrollment, participants were randomized to receive the online safety survey either through the mobile app or emailed a link to the online survey using a four-block randomization design.

Web-based notification arm All participants randomized to the web-based notification arm received the following web-based CANVAS notifications. Briefly, participants received an email notifying them of their registration in the study. Eight days following their influenza vaccine, participants received an email with the survey link asking them to complete their online influenza vaccine safety survey. Participants received a reminder email on day 11 if they did not complete their survey. Further details on CANVAS surveillance and description of the questionnaire can be found here.

Mobile app arm Participants randomized to the mobile app arm, received an email asking them to download the app and activate their account. Users who did not activate their account after 48 hours received a reminder email. Participants who activated their accounts, could spontaneously report an adverse event through the app, and were also notified of the day 8 survey through the app.

Eight days following their vaccination mobile app participants who activated their account received a push notification on their phone to complete their survey. A reminder push notice was sent out on day 11 to participants that had not yet competed the day 8 survey. On November 16, 2020 (mid-way through the recruitment period), additional email reminders in the mobile app arm were implemented on days 2, 4 and 6 to remind participants to register for the app. All participants received a day 8 email directing them to use their CANImmunize account to complete their influenza vaccine survey. Access to the survey link also was available in the email reminder.

Detailed Description

Not available

Study Timeline

• Study Start: 2020-10-01
• Primary Completion: 2021-10-01
• Study Completion: 2021-10-01
• Status Verified: 2023-03
• Study First Submitted: 2023-03-09
• Study First Submitted QC: 2023-03-28
• Last Update Submitted: 2023-03-28
• Study First Posted: 2023-04-03
• Last Update Posted: 2023-04-03

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 2408

Inclusion Criteria

• Speak English or French,
• Have an active email address and telephone • Immunized with the seasonal influenza vaccine
• Parents of children are eligible to participate after the first or second dose of vaccine

Exclusion Criteria

• Those who do not meet the inclusion criteria

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Mobile app arm	Mobile app - CanImmunize	Participants randomized to the mobile app arm, received an email asking them to download the app and activate their account. Users who did not activate their account after 48 hours received a reminder email. Participants who activated their accounts, could spontaneously report an adverse event through the app, and were also notified of the day 8 survey through the app.
Web-based notification arm	Web based notification	All participants randomized to the web-based notification arm received the following web-based CANVAS notifications \[4,5\]. Briefly, participants received an email notifying them of their registration in the study. Eight days following their influenza vaccine, participants received an email with the survey link asking them to complete their online influenza vaccine safety survey. Participants received a reminder email on day 11 if they did not complete their survey.

Primary Outcome Measures

Name	Time	Method
Useability	through study completion - average of 4 months	Following completion of the safety survey, all participants were sent a separate link by email to complete a user experience survey. Participants were asked about their history of participating in the flu vaccine safety survey and whether they previously used the CANImmunize app. Using a Likert scale, participants were asked questions on (i) perceived ease of use, (ii) perceived usefulness, (iii) their attitudes and intention of use towards the platform and (iv) questions pertaining to vaccine confidence and safety.

Trial Locations

Locations (1)

Ottawa Hospital Research Institute; 🇨🇦 Ottawa, Ontario, Canada