If you felt no side effects from your Covid vaccine, should you worry?
No. Feeling terrible after a vaccine isn’t proof of a healthy immune response, according to University of Massachusetts professor Robert Finberg.
Immune systems have 2 lines of defense against foreign “invaders.” The first innate response is short-lived (hours or days).
The second—the adaptive immune response—is the one that really counts. It takes days to weeks, and hinges on the immune system’s T and B cells.
- With mRNA vaccines, 90%+ of people developed the protective adaptive immune response—yet fewer than 50% developed any side effects (and most were mild).
Bottom line: The strength of people’s immune responses to vaccines vary—but post-jab side effects won’t tell you where you stand.
The Washington Post