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The drug company Pfizer said Monday that early analysis showed its vaccine candidate for Covid-19 is more than 90 percent effective at preventing infection.
The news from U.S. pharmaceutical giant Pfizer and its German partner, BioNTech SE, has been welcomed as a major step in the fight against a virus that has plagued the global economy, upended daily life for billions and killed 1.26 million people — nearly 240,000 in the U.S. alone.