Error in Oxford-AstraZeneca Covid-19 vaccine dose: what does it mean?
This week Monday, the world woke up to yet another Covid-19 vaccine news – the Oxford-AstraZeneca vaccine was reported to give highly promising results in both efficacy and safety. This was joyous after Pfizer and Moderna too announced promising results of their vaccine candidates. But on Thursday, multiple news rounded up in the US and UK questioning the data of the Oxford vaccine. But the questions weren’t regarding vaccine’s safety but efficacy. The trial data present three efficacy levels – overall efficacy of 70%, a higher of 90%, and a lower of 62%. This was because during the trial the participants were given different vaccine doses. Some of the volunteers were given half of the planned dose strength in error. But the low dose group produced better results. This has left experts around the world scratching their heads. The Covid-19 vaccine is to be given in two shots, four weeks apart, with the second shot as a booster to the first. Regulators were told of the e...