Pfizer's Covid vaccine efficacy against infection plunges to just 20% after six months

Pfizer's Covid vaccine efficacy against infection plunges to just 20% after six months - but protection against severe illness barely dips, study concludes

  • Pfizer's protection against catching Covid drops to just 20% within six months
  • Effectiveness against severe illness and death remains high for at least 6 months 
  • The study used data from Qatar, where 1million have been jabbed with Pfizer
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