As a doctor, I’m used to looking at data sets to determine when medical studies are working really well, sort of well or not very well at all. And not many things in this world work as incredibly well as vaccines.

That’s why, when the COVID-19 vaccine was granted emergency use authorization in adolescents ages 12-15, I got my 13-year-old daughter, Madeleine, vaccinated right away.

I plan to get her 8-year-old sister, Genevieve...