COVID-19 Vaccine-triggered Relapsing Immune Dysregulation: An Observational Study with Four-year Follow-up

Area of Science:

• Neurology
• Immunology
• Public Health

Background:

• Mandatory COVID-19 vaccination was implemented due to the pandemic.
• Assessing vaccine safety and efficacy is crucial, but pandemic timelines limited extensive study.
• Immune-mediated disorders following vaccination require investigation.

Purpose of the Study:

• To investigate immune-mediated neurological disorders in patients following COVID-19 vaccination.
• To compare the prevalence of primary demyelinating disease with vaccine-induced demyelination.
• To determine the association between specific COVID-19 vaccines and neurological sequelae.

Main Methods:

• A 20-month hospital-based study in South India (March 2020-November 2021).
• Analysis of 3,235 patients with neurological issues, with 1,007 vaccinated against COVID-19.
• Chi-square tests were used to assess the association between neurological sequelae and vaccine type.

Main Results:

• Eighteen patients experienced neurological sequelae post-vaccination, with 16 showing a monophasic pattern.
• A statistically significant difference was observed between primary multiple sclerosis and vaccine-induced demyelination (p < .001).
• No significant difference in neurological sequelae was found between Covishield and Covaxin vaccines (p = .8).

Conclusions:

• COVID-19 vaccination, while beneficial, may trigger immune dysregulation and recurrent events in susceptible individuals.
• The observed association between vaccination and neurological events is an observation-based postulate requiring further research.
• The neurological events in this study were non-fatal and showed permanent remission.