Covid-19: Do many people have pre-existing immunity? – The BMJ   Commentary on Twitter It seemed a truth universally acknowledged that the human population had no pre-existing immunity to SARS-CoV-2, but is that actually the case? Peter Doshi explores the emerging research on immunological responseshttps://t.co/6LYRjxlWBQ — The BMJ (@bmj_latest) September 17, 2020  

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