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Related Experiment Videos

Pyrethroid illnesses in California, 1996-2002.

Janet Spencer1, Michael O'Malley

  • 1California Department of Pesticide Regulation, Worker Health and Safety Branch, Sacramento, CA 95812-4015, USA.

Reviews of Environmental Contamination and Toxicology
|May 9, 2006
PubMed
Summary

California experienced 317 illnesses from pyrethroid pesticide exposure between 1996-2002, with Type II pyrethroids like cyfluthrin causing most cases. Residue exposure and regulatory violations were significant factors, highlighting the need for further research on exposure thresholds.

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Area of Science:

  • Environmental Health
  • Toxicology
  • Occupational Health

Background:

  • Pyrethroids are widely used pesticides with increasing reports of human exposure.
  • Understanding the health impacts and exposure pathways of pyrethroids is crucial for public health.
  • California's extensive pesticide use necessitates a review of associated illness data.

Purpose of the Study:

  • To summarize California's pyrethroid-related illnesses (1996-2002).
  • To analyze pyrethroid inhalation exposure and residue dissipation data.
  • To investigate specific large-scale exposure incidents and regulatory violations.

Main Methods:

  • Reviewed California Department of Pesticide Regulation (DPR) Pesticide Illness Surveillance Program (PISP) and Pesticide Use Reporting (PUR) data.

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  • Analyzed 317 reported illnesses linked to 13 pyrethroids.
  • Conducted inhalation monitoring and residue dissipation studies for specific pyrethroids (cyfluthrin, lambda-cyhalothrin).

    • Main Results:

    • 317 illnesses were associated with pyrethroid exposure; Type II pyrethroids, particularly cyfluthrin, were linked to a majority of cases.
    • Irritant effects (skin, eye, respiratory) were common (84.9%), with systemic symptoms reported in 58%.
    • Residue exposure accounted for nearly half of illnesses, and regulatory violations contributed to 28.4% of cases.

    Conclusions:

    • Pyrethroid residues, especially from Type II compounds like cyfluthrin and lambda-cyhalothrin, can cause significant irritant respiratory symptoms.
    • Field residue levels can approach established irritant thresholds, indicating a risk to exposed populations.
    • Further research is needed to establish definitive exposure thresholds for various pyrethroids and their associated health effects.