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Dr. Anthony Fauci, the nation’s leading infectious disease expert, said a new study could explain the extraordinary range that people experience with the novel coronavirus, from having no symptoms at all or a mild case to hospitalization or death.
Eight months ago, the new coronavirus was unknown. But to some of our immune cells, the virus was already something of a familiar foe.
Nearly every country has struggled to contain the coronavirus and made mistakes along the way.
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