Ten liters of oxygen a minute. That was what it took to keep a 27-year-old woman breathing after a rescued pigeon moved into her family kitchen.
The Kitchen Sanctuary That Triggered Respiratory Failure
The patient arrived at the hospital with progressive shortness of breath that had worsened over the course of a month. She had no significant past medical history and no relevant occupational exposures to suggest why her lungs were failing.
Physicians diagnosed her with acute hypersensitivity pneumonitis—an immune-mediated interstitial lung disease often called bird fancier’s lung. The trigger: prolonged exposure to avian proteins originating from feathers, serum, and droppings inside the home.
Scans, Serology, and the Hunt for Inflammatory Markers
Medical teams immediately ordered a computed tomography pulmonary angiography. While the scan successfully ruled out a pulmonary embolism, it exposed diffuse bilateral ground-glass opacities with a distinct upper-lobe and perihilar predominance.
Laboratory work yielded elevated levels of lactate dehydrogenase and C-reactive protein. At the same time, tests for renal function, liver function, complete blood counts, and cardiac biomarkers came back entirely normal, alongside extensive negative workups for infections and autoimmune conditions.
The definitive answer emerged through serological testing, which confirmed markedly elevated immunoglobulin G antibodies directed specifically against pigeon serum, feathers, and droppings.
Corticosteroids and the Path to Weaning Oxygen
Hospital staff initiated systemic corticosteroid therapy, pairing the drugs with strict orders to eliminate any further contact with avian antigens.
The intervention worked. The woman experienced significant clinical improvement, allowing her to successfully reduce her supplemental oxygen requirements from the alarming initial peak of 10 liters per minute.
Diagnosing the Invisible Domestic Threat
Clinicians managing the case highlighted its broader diagnostic lesson: a meticulous environmental history remains essential for uncovering potentially reversible causes of unexplained dyspnoea and diffuse pulmonary infiltrates.
Frequently Asked Questions
What caused the patient’s respiratory failure?
Prolonged indoor exposure to a rescued pigeon housed inside the family kitchen led to the inhalation of avian proteins, triggering acute hypersensitivity pneumonitis.
What treatments did the patient receive?
Doctors administered systemic corticosteroid therapy and mandated strict avoidance of further avian antigen exposure, which resulted in significant clinical improvement and reduced oxygen requirements.
How was the diagnosis confirmed?
Medical teams combined a compatible exposure history, characteristic radiological findings from computed tomography scans, positive serology for avian-specific immunoglobulin G antibodies, and a positive response to treatment.
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