Gideon, If natural (without a vaccine) herd immunity eventually develops then why did herd immunity to polio/ smallpox/ measles/ chickenpox/ etc. never develop? I am asking: "what is the basis for believing that herd immunity to COVID can ever be achieved, absent a vaccine?"
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Part of the article is explaining this - we have different definitions of the term "herd immunity". Using one definition, we did AT TIMES have HI for measles etc
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