Silicate pneumoconiosis in hens

Area of Science:

• Veterinary Pathology
• Environmental Toxicology
• Occupational Health

Background:

• Silicate pneumoconiosis, a lung disease caused by silica dust inhalation, is typically associated with human occupational exposures.
• Poultry can be exposed to environmental particulate matter from industrial activities.

Purpose of the Study:

• To describe cases of silicate pneumoconiosis in domestic hens exposed to industrial pollution.
• To investigate the composition of inhaled dust particles causing lung disease in these birds.
• To assess the potential of animals as indicators for environmental health risks.

Main Methods:

• Histopathological examination of hen lungs to identify silicotic granulomas and their location.
• Energy dispersive X-ray microanalysis (EDX) combined with transmission and scanning electron microscopy (TEM/SEM) to determine dust composition.

Main Results:

• Thirteen cases of silicate pneumoconiosis were identified in 3- to 4-year-old hens.
• Lung lesions, characterized by dust-laden macrophages forming granulomas, were found in bronchi and surrounding vessels.
• EDX analysis revealed dust composed primarily of silicon, aluminum, calcium, iron, and potassium, with other trace elements present.

Conclusions:

• Domestic hens exposed to industrial emissions from chalk quarries, cement works, and brickworks developed silicate pneumoconiosis.
• The composition of inhaled dust particles was identified.
• Animals in polluted environments can serve as valuable indicators of potential human health risks and pathogenetic mechanisms.