Nigel
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It is being studied, this is quite a good read, even for the non-technical:Wow, that's an interesting aspect I never thought about either- and I can't recall seeing where any of the Professionals have considered it
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...
www.bmj.com
“If it were the case that in London the disease hadn’t disseminated too widely, and only 15% have experienced the virus [as serology tests indicate] . . . under those circumstances, if you lift lockdown, you should see an immediate and commensurate increase in cases, as we have observed in many other settings,” Gupta told The BMJ, “But that hasn’t happened. That is just a fact. The question is why.”
At least six studies have reported T cell reactivity against SARS-CoV-2 in 20% to 50% of people with no known exposure to the virus
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