One shot in the arm, and the whole body is protected. But how? For one thing, the immune system produces antibodies and cells that patrol the entire organism by traveling through the bloodstream. For another, as shown by a recent study of the mRNA coronavirus vaccines, the body builds local immune memory in various organs. According to the findings, the immune memory cells are more numerous in the organs than in the blood. They also have enhanced antiviral defense functions.
Coronavirus vaccination: Body builds immune memory in organs
