Inclusion Criteria: A child will be eligible to participate if they  are aged between 5 and 11 years old at the time of the recruitment; plan to receive a two-dose COVID-19 vaccine; are able to understand and speak English; have at least one of their caregivers' consent to participate in the study, and this caregiver is able to speak and read English have Internet access.  Exclusion Criteria:  serious developmental disabilities (e.g., Autism Spectrum Disorder) or speech/language delays, as it may make it difficult for the participants to complete all necessary study tasks (e.g., assent, memory interview); child's or caregiver's inability to speak and/or understand English