Usability and Perceived Usefulness
SIDE EFFECT, INFLUENZA
In total, 579 participants took the usability survey, with 194 mobile app and 385 web-based notification respondents, respectively. In total, 249 of those completing the usability survey had previously participated in the influenza vaccine safety survey (n=249, 43% of usability respondents) and 13% of usability respondents had used CANImmunize before (mobile app arm only, n=26).Of the 35 mobile app users who completed the survey in the app, only 11 completed the useability survey; hence, we have only reported on the usability responses of the web-based notification platform users (Overall, 99% of web-based notification platform users agreed or strongly agreed that the platform was easy to use, and 88.8% of them thought that it made reporting AEFI easier.When asked about perceived usefulness, 73.8% of web-based notification platform users agreed or strongly agreed that it will make vaccines safer, and 91.4% of them agreed or strongly agreed that it could make it easier for public health professionals to detect vaccine safety issues. The majority of participants (88.8%) agreed or strongly agreed that it made reporting a vaccine side effect easier, using this system was a good idea (93.2%), and that they would use it for additional vaccines (85.9%) or the COVID-19 vaccine (94.0%). Despite this, only 47.4% of web-based notification platform users who completed the usability survey reported that it increased their confidence in vaccine safety. Only 77.7% of users felt confident about data privacy and security.Perceived ease of use, usefulness, attitudes toward use, and intention to use among web-based notification survey users.