Why a vaccine that stops coronavirus won't be enough to end the pandemic

Not long after the new coronavirus first surfaced last December, an ambitious prediction was made: A vaccine would be available within 12 to 18 months, and it would stop the pandemic. Despite serious challenges — how to mass manufacture, supply and deliver a vaccine worldwide — the first prong of that wish could well be fulfilled.

Eight vaccine candidates are undergoing large-scale efficacy tests, so-called Phase 3 trials, and results are expected by the end of this year or early 2021. But even if one, or more, of.

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