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View Astrazeneca Covid Vaccine Efficacy Background . Astrazeneca said its vaccine, developed in collaboration with the university of oxford, was assessed over two different dosing regimens. The vaccine being developed with oxford university was. Phillip Schofield, 58, gets the Covid-19 Oxford ... from i.dailymail.co.uk On monday, researchers said astrazeneca vaccine had an efficacy. How efficacious is the vaccine? The second dose should be administered clinical efficacy. The dose of astrazeneca plc's covid vaccine that showed the highest level of effectiveness was tested in a younger population than a bigger dose that showed less efficacy, according to the head of the u.s. The vaccine being developed with oxford university was. On monday, researchers said astrazeneca vaccine had an efficacy. The second dose should be administered clinical efficacy. Astrazeneca said its vaccine, de...