AstraZeneca’s Revised COVID-19 Vaccine Data Shows Slight Dip in Efficacy

AstraZeneca on Wednesday released an updated estimate showing a slight dip in the efficacy of its COVID-19 vaccine.
AstraZeneca’s Revised COVID-19 Vaccine Data Shows Slight Dip in Efficacy
Vials of the AstraZeneca COVID-19 vaccine. Dado Ruvic/Illustration/Reuters
Isabel van Brugen
Updated:
AstraZeneca released an updated estimate on March 24 that showed a slight dip in the efficacy of its COVID-19 vaccine, days after U.S. officials accused the company of using “outdated information” in a prior report.

The Data Safety Monitoring Board (DSMB), which monitors trials and reviews data collected at regular intervals, had criticized the British drugmaker for not using the most up-to-date information in its interim analysis on March 22, which said its COVID-19 vaccine was 79 percent effective.

Isabel van Brugen
Isabel van Brugen
Reporter
Isabel van Brugen is an award-winning journalist. She holds a master's in newspaper journalism from City, University of London.
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