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AstraZeneca Faces More Vaccine Questions After Manufacturing Error

  • Sketchy details from company, researchers spark concerns
  • More effective dosing regime stemmed from manufacturing error
Bloomberg business news
WATCH: Why AstraZeneca is facing mounting questions.Source: Bloomberg
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AstraZeneca Plc and the University of Oxford, among the front-runners in the quest to deliver a Covid-19 vaccine, face mounting questions about their trial results after acknowledging a manufacturing error.

While an announcement Monday by Astra and Oxford showed their shot was 70% effective on average in a late-stage study, the scant details released by the U.K. partners have sparked worries about whether regulators would clear it. In a later statement, Oxford said a difference in manufacturing processes led to some participants being given a half dose instead of a full one.