Covid-19 Live Updates: Vaccines Protect Against Some Variants, Studies Show

Here’s what you need to know:

Getting a dose of the Pfizer BioNTech Covid-19 vaccine in Aberdeen, Md., on Wednesday. 
Credit…Chip Somodevilla/Getty Images

Several new studies released on Wednesday offered encouraging news about the ability of widely used vaccines to protect against severe Covid-19 cases, including illness caused by some dangerous variants.

Two published studies found that the Pfizer-BioNTech vaccine was extraordinarily effective against severe disease caused by two variants, including the dominant one in the United States. And the results of an early-stage trial of the Moderna vaccine — though not published or vetted by scientists — suggested that a single dose given as a booster was effective against variants first identified in South Africa and Brazil, the…

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