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LONDON – AstraZeneca PLC and the University of Oxford said their Covid-19 vaccine was up to 90% effective in preventing infections without serious side effects in large clinical trials, boosting hope that a third vaccine developed in the West could be cleared before the end of the year.
The partners said on Monday that there had been no serious safety events related to the vaccine and that it was well tolerated across the different dosage regimens. Its effectiveness varied from 62% to 90% depending on the dosage administered, with an average …
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