RE: Israel cases rise to record8 Sep 2021 15:42
It's B-cells (and, long-term, the Memory B-Cells) that are activated by a reinfection to produce more antibody of the type (more or less - that's complicated...) that wiped out the first similar infection. The T-cells (and, long-term, the Memory T-cells) that are also activated by reinfection but T-cells cannot secrete antibody molecules and are, rather, adapted to attack foreign cells and infected 'self' cells. They will attack 'self' cells infected by virus, thus helping to quell the infection but the more important mechanism of dealing with tiny viruses is to employ the 'infantry' (antibody) rather than the B52s (the T-cells). Of course, it's a bit (well, actually a lot) more complicated and B-cells and T-cells (and others...!) interact.... but that's the basics.