Flock worker's lung
Occupational lung disease from inhaling flock fibers.
Flock worker's lung is an occupational lung disease that results from inhaling small fibers known as flock, which are glued to a surface to produce a textured finish. Workers in the flocking industry are at risk of breathing in these tiny fiber fragments, leading to interstitial lung disease. The condition was first identified in 1998, when a cluster of employees at a flocking facility developed interstitial lung disease with no known cause.
Signs and symptoms include crackling sounds in the lungs called rales, shortness of breath, and coughing. CT scans of the chest may show ground glass opacity and reticular opacity. Under a microscope, the typical findings are bronchiolocentric interstitial pneumonitis and lymphocytic bronchiolitis with lymphocytic hyperplasia. In some cases, desquamative interstitial pneumonia or bronchiolitis obliterans organizing pneumonia are also seen. Other reported symptoms include pleuritic chest pain and atypical chest pain. Most cases have been chronic and progressive. Lung function is generally reduced, with both restrictive and obstructive patterns.
The disease is caused by inhaling small pieces of flock, usually nylon, that are generated during the flocking process. Exposure to rotary-cut flock particles is the main risk factor; whether other types of flock cause this pulmonary fibrosis is not yet known. Other flock materials include rayon, polypropylene, and polyethylene. Workers exposed to debris from nylon, polypropylene, polyethylene, and rayon have developed the disease. Higher concentrations of respirable flock particles are linked to more severe illness. As of 2015, research is ongoing into whether smoking affects the progression or incidence of the disease. Studies in rats have shown that nylon flocking is a causative agent.
Diagnosis is based on a CT scan of the lungs, histopathology, and a history of working in the flocking industry. The differential diagnosis may include Sjögren's syndrome and lymphoid interstitial pneumonia. Flock worker's lung can be mistaken for asthma or recurrent pneumonia. While X-rays may show abnormalities, CT scans are more useful for diagnosis. Other diagnostic methods include transbronchial biopsy or wedge biopsy.
Prevention relies on engineering controls to keep workers from inhaling flock. These controls include using guillotine cutters instead of rotary cutters and keeping blades
- field
- Occupational lung disease
- known_for
- Interstitial lung disease caused by inhaling flock fibers
- first_described
- 1998
- affected_industries
- Flocking plants
- reported_locations
- United States, Canada, Turkey, Spain
- causative_materials
- Nylon, rayon, polypropylene, polyethylene
Lore & Background
Flock worker's lung is caused by exposure to small pieces of flock, usually nylon, created during the flocking process and inhaled. Exposure to rotary-cut flock particulates is the main risk factor; whether other types of flock cause this pulmonary fibrosis is not yet determined. Workers exposed to nylon, polypropylene, polyethylene, and rayon flocking debris have developed the disease. Research in rats has shown that nylon flocking is a causative agent.
Signs and symptoms include rales, dyspnea, and coughing. CT scans can show ground glass opacity and reticular opacity. Histopathology typically reveals bronchiolocentric interstitial pneumonitis and lymphocytic bronchiolitis with lymphocytic hyperplasia. Most cases have been chronic and progressive. Lung function is generally diminished, with both restrictive and obstructive defects.
Diagnosis involves CT scan, histopathology, and a history of working in the flocking industry. Differential diagnosis may include Sjögren's syndrome and lymphoid interstitial pneumonia. Prevention includes engineering controls such as guillotine cutters, sharp blades, NIOSH-certified respirators, medical surveillance programs, and cleaning with alternatives to compressed air. Treatment generally involves removing the individual from exposure; symptoms improve within days to weeks. The benefits of glucocorticoid therapy are unclear.
Reader's Guide
Flock worker's lung is significant as a recognized occupational lung disease first formally described in 1998 following outbreaks in Ontario and Rhode Island. It highlights the risks of inhaling respirable particulates in manufacturing environments, particularly from rotary-cut nylon flock. The disease underscores the importance of engineering controls and medical surveillance in preventing and diagnosing occupational illnesses. Its identification corrected earlier misattributions to mycotoxins in adhesives. Ongoing research as of 2015 examines whether smoking affects progression or incidence, and whether the disease raises the risk for lung cancer. Cases have been reported in the United States, Canada, Turkey, and Spain, indicating a global occupational health concern. The condition remains a focus for improving workplace safety and understanding the long-term effects of inhaled synthetic fibers.
Did You Know?
- Flock worker's lung was first formally described in 1998 after outbreaks in Ontario and Rhode Island.
- Exposure to rotary-cut flock particulates is the main risk factor for the disease.
- Symptoms generally improve within days to weeks after stopping exposure to flock.
- As of June 1999, 24 flock workers had been diagnosed with the disease.
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