When the coronavirus attacks the body, the immune system steps up, trying to respond quickly and powerfully enough to stop the virus from running wild.
We look at the science behind the need for COVID-19 booster shots.
Beyond that, Weiskopf said, each person has multiple different T cells, and their T cells are different from everyone else’s. If by some rare misfortune a new variant managed to dodge all of your memory T cells, she said, it would still encounter plenty of effective T cells in the rest of the population.
But if you’ve been immunized, you can have killer T cells ready in four days or fewer, Wherry said. That head start makes a huge difference in keeping an infection from raging out of control.
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