Outcomes
INFLUENZA
The primary outcome was receipt of at least 1 dose of influenza vaccine by September 30, 2021 (the end of the trial period), as confirmed on the AIR. Secondary outcomes were receipt of at least 1 dose of influenza vaccine during the optimal period (April 1-June 30) among children randomly assigned on or before June 15, and time (in days) between random assignment and receipt of vaccination. Parental acceptability of the SMS intervention was assessed.