AstraZeneca’s vaccine dosing ‘mistake’ led to new dosage finding in mice

A dosing error made during an AstraZeneca-University of Oxford COVID-19 vaccine trial has led to a new dosage finding in mice, reports a new Northwestern Medicine study.

During the AstraZeneca-Oxford trial, some human participants erroneously received a half dose of their first shot, followed by a full dose for their second shot. Paradoxically, the trial showed that volunteers who got a lower dose of the first shot were better protected against COVID-19 than those who received two full doses.