Potential Covid vaccine from Pfizer, BioNTech crosses major threshold

Pfizer Inc. and BioNTech SE's experimental Covid-19 vaccine — tested at Northern California clinical trial sites — was more than 90% effective, according to early data reported Monday from the 44,000-person study. While new Covid infections have surged in the United States in recent weeks and more than 1.2 million people have died worldwide from the virus, the news offers the potential for ending shelter-in-place and work-from-home mandates that have crushed the economy. The Pfizer news was…

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