Neurologic adverse events following influenza A (H1N1) vaccinations in children

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Seung Jae Lee1, Young Ok Kim, Young Jong Woo

  • 1Department of Pediatrics, School of Medicine, Chonnam National University, Gwangju, Korea.

Pediatrics International : Official Journal of the Japan Pediatric Society
|February 4, 2012
PubMed

Insights

Pediatric neurologic adverse events (NAE) following the H1N1 vaccine were primarily motor weakness from polyneuropathy. Most children recovered fully within months, showing good prognosis for post-vaccine H1N1 neuropathy.

Area of Science:

  • Neurology
  • Vaccinology
  • Pediatrics

Background:

  • Limited pediatric data exists on neurologic adverse events (NAE) post-monovalent pandemic influenza A (H1N1) vaccination.
  • Guillain-Barré syndrome is a rare but serious potential NAE.
  • Understanding pediatric NAE is crucial for vaccine safety monitoring.

Purpose of the Study:

  • To review pediatric NAE data following H1N1 vaccination.
  • To analyze the clinical course and outcomes of children with peripheral neuropathy after H1N1 vaccination.

Main Methods:

  • Retrospective review of 14 pediatric cases with NAE post-H1N1 vaccination.
  • Single-center study at Chonnam National University Hospital (November 2009 - March 2010).
  • Assessment of clinical diagnoses and follow-up for patients with peripheral neuropathy.

Main Results:

  • Polyneuropathy was the most common NAE (78.6%), presenting as motor weakness.
  • Peripheral neuropathy diagnosed in 92.9% of cases (13/14).
  • Two patients met criteria for Guillain-Barré syndrome (Level 3 certainty).

Conclusions:

  • Post-vaccine NAE were predominantly motor weakness due to polyneuropathy.
  • Complete recovery occurred within months without long-term sequelae.
  • H1N1 vaccination in children showed a generally good prognosis for NAE.
Abstract

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