A test series for pesticide dermatitis

Area of Science:

• Dermatology
• Occupational Health
• Agricultural Science

Background:

• Pesticide exposure is a concern for agricultural workers, potentially leading to adverse skin reactions.
• Patch testing is a standard method for identifying contact allergens.
• Understanding specific fungicide sensitivities is crucial for worker safety and health management.

Purpose of the Study:

• To evaluate the prevalence and types of allergic contact dermatitis to pesticides in agricultural workers.
• To identify specific fungicides responsible for positive patch test reactions.
• To assess the significance of reactions to different classes of pesticides.

Main Methods:

• A pesticide patch test series was administered to 200 subjects.
• Fifty of the subjects were identified as agricultural workers.
• Reactions were assessed, with a focus on fungicides, thiophthalimides, bis-dithiocarbamates, and benomyl.

Main Results:

• Twenty-four subjects (48% of agricultural workers) showed positive reactions to fungicides.
• The majority of positive fungicide reactions were attributed to thiophthalimides, specifically captan, difolatan, and folpet.
• Reactions to bis-dithiocarbamates and benomyl were infrequent, and other pesticides elicited insignificant responses.

Conclusions:

• Thiophthalimide fungicides, including captan, difolatan, and folpet, are significant contact allergens in agricultural workers.
• Patch testing can effectively identify specific pesticide sensitivities.
• Further investigation into protective measures against these specific fungicides is warranted for occupational health.