Majority Are Already Immune Against SARS-CoV-2

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STORY AT-A-GLANCE

  • Several studies suggest immunity against SARS-CoV-2 infection is far more widespread than anyone imagined, and that the threshold for herd immunity is far lower than previously estimated
  • German research shows that even among unexposed individuals, 81% were resistant or immune to SARS-CoV-2 infection
  • Common colds caused by the betacoronaviruses OC43 and HKU1 might make you more resistant to SARS-CoV-2 infection
  • If a majority already have some measure of immunity against COVID-19 due to previous exposure to other coronaviruses, then we’ve probably already reached the threshold for herd immunity and vaccinating every human on the planet is unnecessary
  • Several studies suggest the herd immunity threshold is well below 50%, according to one study, as low as 9%. Meanwhile, a mathematical model suggests immunity against SARS-CoV-2, globally, might be as high as 80%

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