Covid is likely to persist once its pandemic phase has passed and circulate each winter alongside the flu. Even after more of us contract coronavirus infection and develop immunity to it or even after an effective vaccine arrives, some people will still get very sick.

America tolerates a heavy toll from the flu on health and productivity. But if Covid becomes a twin risk, the heath-care system will struggle to fight both at once. Limiting Covid’s impact requires us to think differently about confronting respiratory pathogens…



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