Peter C. Doherty

"Once we're vaccinated, we have memory B cells and T cells that are readily kicked back into action by either a vaccine booster shot, or by catching COVID-19. This is active protection, we're simply jump starting the natural immunity we've relied on through evolution."

"They rely on what they call 'natural immunity', a term that's new to me."

"I've been working on the immune response to viruses for decades, am an author on hundreds of research papers and, in my professional life, can't recall that I've ever use the term 'natural immunity'. It's just immunity."