Over 600 people, average age 80.5, all receiving Pfizer vaccination. Yet another study that confirms the advantage of Prior Covid + vaccination for superior immune response vs 2-dose vaccine, in a very high risk grouphttps://t.co/cA5erAoF7B pic.twitter.com/bFhXf5pe3Y

— Eric Topol (@EricTopol) October 20, 2021