Prognosis
Astra Vaccine’s 90% Efficacy in Covid Came in Younger Group
- Smaller dose was more effective than larger in study
- Researchers have been struggling to understand results
This article is for subscribers only.
The dose of AstraZeneca Plc’s Covid vaccine that showed the highest level of effectiveness was tested in a younger population than a bigger dose that showed less efficacy, according to the head of the U.S. Operation Warp Speed program.
The vaccine being developed with Oxford University was 90% effective when a half-dose was given before a full-dose booster, the partners said on Monday. However, that regime was administered to participants in a group whose age was capped at 55, Warp Speed’s Moncef Slaoui said Tuesday in a phone call with reporters.