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Updated: Oct 26, 2025

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A rare form of encephalitis occurred in a few individuals after receiving the ChAdOx1 nCoV-19 vaccine. Prompt treatment with corticosteroids proved effective for these rare postvaccination neurological complications.

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Area of Science:

  • Neurology
  • Immunology
  • Vaccinology

Background:

  • The SARS-CoV-2 pandemic spurred rapid vaccine development, with several vaccines like ChAdOx1 nCoV-19 demonstrating high efficacy and safety in trials.
  • Widespread vaccination campaigns aim to control the global health crisis caused by SARS-CoV-2.

Observation:

  • This case series describes patients who developed encephalitis temporally associated with ChAdOx1 nCoV-19 vaccination.
  • The observed cases met diagnostic criteria for possible autoimmune encephalitis.

Findings:

  • The incidence of postvaccinal encephalitis following ChAdOx1 nCoV-19 vaccination is estimated at approximately 8 per 10 million doses.
  • Patients in this series responded favorably to immunosuppressive therapy, particularly corticosteroids.

Implications:

  • While rare, postvaccinal encephalitis is a potential complication of ChAdOx1 nCoV-19 vaccination that requires timely diagnosis and management.
  • Further large-scale observational studies are needed to confirm causality and better understand the incidence and risk factors.