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[First ciguatera outbreak in Germany in 2012].

Miriam Friedemann1

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Summary

Ciguatera fish poisoning outbreaks in Germany, linked to imported tropical fish, caused prolonged neurological symptoms in some patients. This highlights the need for increased physician awareness and improved import controls to prevent future cases.

Keywords:
CiguateraCiguatoxinLutjanus malabaricusOutbreakRed snapper

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Area of Science:

  • Toxicology
  • Foodborne Illness
  • Neurology

Background:

  • Ciguatera fish poisoning is a significant health concern associated with consuming tropical reef fish.
  • Cases in non-endemic regions like Germany are often linked to imported seafood, posing diagnostic challenges.
  • Previous documentation of long-term ciguatera symptoms in Germany was limited.

Purpose of the Study:

  • To investigate a 2012 ciguatera outbreak in Germany linked to imported Lutjanus spp.
  • To characterize the clinical presentation, duration, and neurological sequelae of the affected patients.
  • To assess the effectiveness of control measures and identify challenges in outbreak investigation.

Main Methods:

  • A questionnaire-based study was conducted with 23 confirmed ciguatera cases.
  • Information on symptoms, disease course, and fish consumption was collected.
  • Follow-up assessments were performed for up to three years; ciguatoxin analysis was conducted on fish samples.

Main Results:

  • Twenty-three cases of ciguatera were identified, primarily with gastrointestinal and neurological symptoms, including cold allodynia.
  • Seven patients experienced prolonged paresthesia exceeding one year, with two reporting neuropathies for nearly three years.
  • Outbreak investigations revealed mislabeling of fish species and origins, complicating case ascertainment and highlighting the need for better import regulation.

Conclusions:

  • This study provides detailed documentation of long-term neurological persistence of ciguatera symptoms in Germany.
  • The findings underscore the increasing significance of ciguatera in Germany due to imported fish and a lack of physician awareness.
  • Improved diagnostic awareness, stricter import controls, and accurate fish labeling are crucial for preventing future outbreaks.