Read a blurb yesterday about Tcell herd immunity.
It was kind of fascinating and basically means her immunity reached sooner with less infected people.
I didn’t read that yesterday but it has been common knowledge for about three months. It’s why the so called disappearance of antibodies in the blood stream in ninety days is. It a problem as immunity moves into T cells. It’s also worth noting that multiple vaccines are noted to stimulate T cell and antibody immunity simultaneously.