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Clinical Summary

COVID-19: all 3 vaccines show huge drop in effectiveness in large US cohort

Cohn BA & al.. Science, 04 November 2021
Miriam Davis, PhD   |   18 November 2021

Takeaway

  • During the Delta surge in 2021, vaccine effectiveness against infection (VE-I) by SARS-CoV-2 dropped strikingly for all 3 vaccines among a large US sample of nearly 500,000 vaccinated veterans.
  • The greatest drop in effectiveness occurred with the Janssen/Johnson & Johnson (J&J) vaccine, which declined from 86.4% to 13.1%.
  • The vaccines...

          

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