Damage to myelin around nerves.

"This results from diseases that damage myelin sheaths or the cells that form them. These diseases should be distinguished from those in which there is a failure to form myelin normally (sometimes described as dysmyelination).1

1 Source:  https://pmc.ncbi.nlm.nih.gov/articles/PMC1860500/ 

adverse events
A Death for Guillain-Barrè Syndrome After Receiving a COVID-19 Vaccine: A Case Report
A review of the potential neurological adverse events of COVID-19 vaccines
A systematic review of cases of CNS demyelination following COVID-19 vaccination
Acute Inflammatory Diseases of the Central Nervous System After SARS-CoV-2 Vaccination
Acute transverse myelitis after BNT162b2 vaccination against COVID-19: Report of a fatal case and review of the literature
Acute-onset chronic inflammatory demyelinating polyneuropathy following AstraZeneca COVID-19 vaccine: a case report
AstraZeneca COVID-19 vaccine and Guillain- Barré Syndrome in Tasmania: A causal link?
Cardiac and Neurological Complications Post COVID-19 Vaccination: A Systematic Review of Case Reports and Case Series
Clinical Research into Central Nervous System Inflammatory Demyelinating Diseases Related to COVID-19 Vaccines
CNS Demyelination Syndromes Following COVID-19 Vaccination: A Case Series
Fatal Acute Disseminated Encephalomyelitis Post-COVID-19 Vaccination: A Rare Case Report
Fatal Acute Hemorrhagic Encephalomyelitis and Antiphospholipid Antibodies following SARS-CoV-2 Vaccination: A Case Report
Guillain-​Barré Syndrome Associated with COVID-19 Vaccination
Guillain-Barré syndrome associated with SARS-CoV-2 vaccination: how is it different? a systematic review and individual participant data meta-analysis
Guillain-Barré Syndrome Following the Administration of Adenovirus Vector-Based COVID-19 Vaccine
Guillain-Barré Syndrome Induced by Vaccination Against COVID-19: A Systematic Review and Meta-Analysis
Guillain–Barre syndrome following COVID-19 vaccination: a study of 70 case reports
Guillain–Barré syndrome following different COVID-19 vaccines: a case series
Incidence of Guillain–Barré syndrome following SARS‐CoV‐2 immunization: Analysis of a nationwide registry of recipients of 81 million doses of seven vaccines
Neurologic Sequela of COVID-19: Guillain-Barré Syndrome Following Johnson & Johnson COVID-19 Vaccination
Neurological Conditions Following COVID-19 Vaccinations: Chance or Association?
Neurological side effects of SARS-CoV-2 vaccination are common and can be severe
Neurological Side Effects of SARS-CoV-2 Vaccinations are Not Uncommon but Frequently Ignored
Neuromuscular diseases associated with COVID-19 vaccines: a systematic review and pooled analysis of 258 patients
Reports of Guillain-Barré Syndrome After COVID-19 Vaccination in the United States
Safety of COVID-19 Vaccines: Spotlight on Neurological Complications
Spectrum of Neuroimaging Findings in Post-COVID-19 Vaccination: A Case Series and Review of Literature
Spectrum of neurological complications following COVID-19 vaccination
Temporal association between the age-specific incidence of Guillain-Barré syndrome and SARS-CoV-2 vaccination in Republic of Korea: a nationwide time-series correlation study
The Potential Role of SARS-CoV-2 Infection and Vaccines in Multiple Sclerosis Onset and Reactivation: A Case Series and Literature Review
Variant Guillain–Barre Syndrome Following SARS-CoV-2 Vaccination: Case Report and Review of the Literature
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