Prof. Martin Kulldorff Prof. Martin Kulldorff on Natural Immunity By Contributing Writers - October 31, 2021 Share Facebook Twitter Pinterest WhatsApp Linkedin VK "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