The world may be overestimating the power of Covid-19 vaccines

The world may be overestimating the power of Covid-19 vaccines

The world needs Covid-19 vaccines. It may also be overestimating their power

By HELEN BRANSWELL

HYACINTH EMPINADO/STAT

Vaccines against the disease are desperately needed, but they won’t necessarily prevent all or even most infections, experts say.

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