Covid-19: Do many people have pre-existing immunity?

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 responses Even in local areas that have experienced some of the greatest rises in excess deaths during the covid-19 pandemic, serological surveys since the peak indicate that at most only around…

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BMJ:

Archive Online archive 2023 07 October 2023(vol 383, issue 8401) 07 October 2023(vol 383, issue 8401) …