The Oxford-AstraZeneca COVID-19 vaccine was a viral vector vaccine developed in the United Kingdom, which used a transmogrified version of a chimpanzee adenovirus. The shot was approved for use in the U.K. in December 2020 and later approved by the World Health Organization. It was not rolled out at the outset in the U.S., although the Biden administration did agree to share up to 60 million doses with other nations.
By January 2022, the vaccine had been injected globally more than 2.5 billion times.
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