Eosinophilic pneumonia caused by Alternaria alternata

Area of Science:

• Pulmonary Medicine
• Environmental Health
• Allergy and Immunology

Background:

• Eosinophilic pneumonia is a rare lung disease characterized by inflammation and the accumulation of eosinophils in the lungs.
• Identifying specific environmental triggers is crucial for managing and preventing recurrent episodes of eosinophilic pneumonia.

Observation:

• A patient presented with hypoxemia and diffuse bilateral pulmonary infiltrates, diagnosed as eosinophilic pneumonia.
• Symptoms recurred upon returning home, prompting an investigation into environmental factors.
• An environmental survey identified Alternaria alternata in the patient's home.

Findings:

• Bronchoalveolar lavage and lung biopsy confirmed eosinophilic pneumonia.
• Serum analysis revealed a high titer of anti-Alternaria alternata antibody (IgG).
• An inhalation bronchoprovocation test with Alternaria alternata antigen was positive, confirming sensitization.

Implications:

• This case strongly suggests Alternaria alternata as a probable etiological agent for eosinophilic pneumonia.
• Environmental control measures targeting mold exposure may be vital for patients with similar presentations.
• Further research into fungal triggers for eosinophilic pneumonia is warranted.