The drug companies Pfizer and BioNTech say the coronavirus vaccine they're developing seems to be 90% successful at preventing people from getting Covid-19. The results aren't final, but the news is much better than many experts expected.
The drug companies Pfizer and BioNTech say the coronavirus vaccine they're developing seems to be 90% successful at preventing people from getting Covid-19. The results aren't final, but the news is much better than many experts expected.
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