LONDON—The Covid-19 vaccine being developed by the University of Oxford and AstraZeneca PLC was found to be as much as 90% effective in preventing infections without serious side effects in a large clinical trial, the partners said Monday.
AstraZeneca said there were no serious safety events related to the vaccine and it was well tolerated across different dosing regimens. Efficacy ranged from 62% to 90% depending on the dosage given, the partners said. AstraZeneca and Oxford said the average efficacy in the analysis was…
