Prof. Martin Kulldorff on Natural Immunity Contributing Writers 2 years ago "For ~2500yrs we’ve known about natural immunity.. It is stronger & longer-lasting than if you have a vaccine. Hospitals should hire nurses/staff with natural immunity.. And we are doing the opposite, they are being fired…"—Harvard Prof @MartinKulldorffpic.twitter.com/xtk9E549Vx— Kulvinder Kaur MD (@dockaurG) October 28, 2021