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Occupational asthma caused by FD&C blue dye no. 2
M E Miller1, Z L Lummus, D I Bernstein
1Department of Internal Medicine, University of Cincinnati, OH 45267-0563, USA.
Allergy and Asthma Proceedings
|January 1, 1996
Summary
Occupational asthma was diagnosed in a worker exposed to FD&C Blue Dye No. 2 (Indigotine). This case highlights the potential for synthetic dyes to cause respiratory issues, even when standard allergy tests are negative.
Area of Science:
- Occupational Medicine
- Allergology
- Toxicology
Background:
- Occupational asthma is a significant concern in industries involving chemical exposure.
- Synthetic dyes are widely used in food production, necessitating an understanding of their potential health effects.
Observation:
- A 55-year-old male reported immediate respiratory symptoms including cough, dyspnea, and wheezing upon occupational exposure to FD&C Blue Dye No. 2 (Indigotine).
- Symptoms occurred consistently over two years, specifically linked to handling Indigotine powder.
Findings:
- Standard allergy testing (prick tests, ELISA) for Indigotine was negative.
- Bronchial challenge testing confirmed a significant decline in FEV1 (Forced Expiratory Volume in 1 second) post-exposure to Indigotine, indicative of asthma.
- Negative bronchial challenge to sodium sulfate ruled out non-dye additives as the cause.
Implications:
- This is the first documented case of occupational asthma attributed to FD&C Blue Dye No. 2.
- The underlying pathogenesis appears non-IgE mediated, suggesting alternative immune or direct irritant mechanisms.
- Highlights the need for vigilance regarding respiratory sensitization to synthetic food dyes in occupational settings.