morrobay Posted July 20, 2021 Share Posted July 20, 2021 (edited) https://onlinelibrary.wiley.com/doi/10.1002/jmv.26958 80 % of Covid 19. cases are mild or Asymptomatic. This is not the only study that suggests/shows that past exposures to Endemic Coronaviruses produces T cell cross reactivity to covid 19. And can explain why some healthy people who lack this previous exposure can have very serious covid 19. Edited July 20, 2021 by morrobay Link to comment Share on other sites More sharing options...
morrobay Posted July 20, 2021 Author Share Posted July 20, 2021 https://www.sciencedirect.com/science/article/pii/S1386653221001141 This is a serious study on this topic Link to comment Share on other sites More sharing options...
internationalism Posted July 20, 2021 Share Posted July 20, 2021 there is theory, published sometimes in november last year, that very similar virus was in south-east asia some 15-20k years ago. That would explain immunity at the beginning of pandemic Link to comment Share on other sites More sharing options...
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