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@joelle_emerson ("Joelle Emerson") retweeted:
@EricTopol ("Eric Topol") wrote:
Instead of achieving population-level (herd) immunity, whereby >70% vaccinated wind up protecting those w/o immunity, the very high contagiousness of Delta has flipped the model—"un-herd" immunity—the unvaccinated are infecting each other and the vaccinated.