Data Collection
INFLUENZA
The study coordinator (K.H.) followed up all study participants. Baseline demographic information were collected for all parent-child pairs including the child’s age, sex, Aboriginal or Torres Strait Islander status, medical specialty, postcode (to determine Index of Relative Socioeconomic Disadvantage and residential location, ie, metropolitan/regional), and influenza vaccine receipt (from AIR) in 2019, 2020, and 2021. All collected identifiable data were stored on a WCHN secure database, with access to the database controlled by password protection.