So does donating blood on a regular basis reduce vaccine efficacy over time? It seems you'd be giving away the T-cells. For a person with 8 pints of blood, making 5 one pint donations would reduce the number of original T-cells by about half. Unless there is a storage place for them. Do these have an affinity for hanging out in the spleen compared to other cells? That would prevent their loss during bleeding.
Original press release (phys.org just aggregates them):<p><a href="http://news.berkeley.edu/2017/12/13/researchers-discover-how-cells-remember-infections-decades-later/" rel="nofollow">http://news.berkeley.edu/2017/12/13/researchers-discover-how...</a>