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49+ Astrazeneca Vaccine Efficacy Uk Images . Vaccine developed in uk by astrazeneca and oxford university 'will save many lives', says scientist. That's because different doses of the vaccine were used. Oxford AstraZeneca seek Covid vaccine approval after ... from s.yimg.com Astrazeneca's vaccine was tested in multiple countries, including brazil, the u.s. Longer dose intervals within the 8 to 12 weeks range are associated with greater vaccine efficacy. That's because different doses of the vaccine were used. Vaccine developed in uk by astrazeneca and oxford university 'will save many lives', says scientist. Astrazeneca's chief executive today said that the firm was likely to carry out another trial of its potential coronavirus vaccine after doubts were raised as to its efficacy. Astrazeneca's vaccine was tested in multiple countries, includ...