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About 1,500 of the initial volunteers in a late-stage clinical trial of the Oxford-AstraZeneca COVID-19 vaccine were given the wrong dose, but were not informed that a mistake had been made after the blunder was discovered, documents obtained by Reuters news agency show. Instead, the dosing mishap was presented to the trial participants in a letter dated June 8 as an opportunity for University of Oxford researchers to learn how well the vaccine works at different doses. The letter was signed by the trial’s chief investigator, Oxford professor Andrew Pollard, and sent to the trial subjects. As Reuters reported on December 24, participants were given about a half-dose due to a measuring mistake by Oxford researchers. The Pollard letter did not acknowledge any error. Nor did it disclose that researchers had reported the issue to British medical regulators, who then told Oxford to add another test group to receive the full dose, in line with the trial’s original plan.

United kingdomAndrew pollardArthur caplanSimon woodsSteve pritchardUniversity of oxfordDurham universityRegulatory agencyHealth research authorityNewcastle universityEuropean unionMedical ethicsNew york university grossman schoolGlobal statistical analysis planParticipant informationஒன்றுபட்டது கிஂக்டம்