> In an otherwise healthy adult, what puts your immune system through it's paces - what gives your immune system a workout - like having the flu ? Getting a va

> In an otherwise healthy adult, what puts your immune system through it's paces - what gives your immune system a workout - like having the flu ? Getting a vaccine is training for the big game. Getting the virus is the big game. Show up to the big game without proper training and you might win, have a few broken ribs, a new face, a limp, or you might just straight up lose.