Guillain-Barré syndrome (GBS)
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What: Progressive muscle weakness and numbness; can be severe.
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Which vaccines: Signal stronger for adenoviral-vector vaccines (e.g., AstraZeneca / Vaxzevria, Johnson & Johnson) in several studies; less signal for mRNA vaccines.
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How common: Rare — observed increases in some datasets within ~6 weeks after vaccination; absolute numbers are small but statistically detectable in large cohorts.
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