The head of the U.S. Operation Warp Speed program said that the dose of AstraZeneca Plc’s COVID vaccine that showed the highest level of efficacy was tested among a younger population than a bigger dose that showed less efficacy.
Being developed with Oxford University, the vaccine was 90 per cent effective when a half-dose was given before a full-dose booster, said the partners. “The regime was administered to participants in a group whose age was capped at 55,” said Warp Speed’s Moncef Slaoui.
The researchers are still confused about the AstraZeneca report wondering why a smaller dose might have appeared to be more effective than a larger one.
Photo Credit : https://en.wikipedia.org/wiki/AstraZeneca#/media/File:AstraZeneca.svg
