Bird Keeper's lung without bird keepinge

Area of Science:

• Immunology
• Environmental Health
• Pulmonology

Background:

• Identifying causative allergens in hypersensitivity pneumonitis (HP) is often difficult.
• Anamnestic data analysis is crucial for pinpointing allergen sources.
• HP can result from environmental exposures, even without direct contact with the source.

Purpose of the Study:

• To report a case of hypersensitivity pneumonitis caused by budgerigar antigen.
• To investigate the source of allergen exposure in a patient with unexplained HP.
• To demonstrate the presence of budgerigar antigen in the patient's home environment.

Main Methods:

• Case report of a 32-year-old female with hypersensitivity pneumonitis.
• Detection of precipitating antibodies against various antigens (pigeon, budgerigar, hay, Aureobasidium pullulans).
• Western blot analysis of patient's serum against budgerigar serum and home dust samples.
• Comparison of patient's and husband's serum reactivity to dust samples.

Main Results:

• Patient had precipitating antibodies against budgerigar antigen and protein structures in home dust.
• Western blot confirmed IgG reactivity to budgerigar antigen and home dust in the patient, but not her husband.
• The patient's lung function significantly improved with corticosteroid treatment and remained stable after antigen reduction.

Conclusions:

• House dust containing budgerigar antigen was identified as the cause of hypersensitivity pneumonitis through indirect exposure.
• Immunological testing, including Western blot, is valuable for identifying specific allergens in HP.
• Environmental allergen reduction can lead to clinical improvement in hypersensitivity pneumonitis.