In this undated file photo issued by the University of Oxford on Monday, Nov. 23, 2020, a researcher in a laboratory works on the coronavirus vaccine. –   Copyright  University of Oxford/John Cairns via AP, File AstraZeneca and Oxford University’s coronavirus vaccine candidate’s high efficacy may have been in part due to a dosing error. In the press release … Continue reading AstraZeneca reveals dosing mistake in coronavirus vaccine trials