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An outbreak of phytophotodermatitis due to celery

E Finkelstein1, U Afek, E Gross

  • 1Department of Dermatology, Soroka Medical Center of Kupat Holim, Faculty of Health Sciences, Beer-Sheva, Israel.

International Journal of Dermatology
|February 1, 1994
PubMed
Summary

Celery harvest workers experienced a phytophotodermatitis outbreak due to high psoralen levels in celery. Late harvesting and sun exposure exacerbated the condition, highlighting occupational risks.

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Area of Science:

  • Dermatology
  • Occupational Health
  • Plant Science

Background:

  • Celery contains psoralens, photosensitizing compounds that can cause skin reactions upon exposure to ultraviolet A (UVA) radiation.
  • An outbreak of phytophotodermatitis affected 11 workers during a celery harvest in southern Israel.

Purpose of the Study:

  • To investigate the trigger factors behind an outbreak of phytophotodermatitis among celery harvest workers.
  • To quantify psoralen levels in harvested celery and assess environmental conditions.

Main Methods:

  • Investigated trigger factors through worker interviews on working conditions.
  • Quantified total psoralen levels in celery samples using high-performance liquid chromatography (HPLC).
  • Measured ambient UVA radiation levels.

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Main Results:

  • Celery from southern Israel had significantly higher psoralen levels (84 µg/g f.wt.) compared to northern celery (35 µg/g f.wt.).
  • Subsequent year's southern celery showed reduced psoralen levels (26 µg/g f.wt.).
  • Risk factors included fair skin, lack of protective clothing, moist hands, and sunny weather conditions.

Conclusions:

  • Multiple factors contributed to the phytophotodermatitis outbreak.
  • Late-season harvesting in southern Israel was identified as the cause of elevated psoralen levels in celery, leading to the outbreak.