A case of humidifier lung potentially caused by Cryptococcuslaurentii
Mayako Mori1, Takashi Kido1, Noriho Sakamoto1
1Department of Respiratory Medicine, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, 852-8501, Japan.
Respiratory Investigation
|August 27, 2025
Summary
Humidifier lung, a form of hypersensitivity pneumonitis, can be caused by Cryptococcus laurentii. This finding suggests non-immunosuppressed individuals may develop humidifier lung from this common yeast.
Area of Science:
- Pulmonary Medicine
- Microbiology
- Immunology
Background:
- Humidifier lung is a hypersensitivity pneumonitis triggered by inhaling antigens from contaminated humidifier vapor.
- Identifying specific causative antigens is vital for managing hypersensitivity pneumonitis.
- Cryptococcus laurentii is typically an opportunistic pathogen.
Observation:
- A 60-year-old man presented with fever and dyspnea, indicative of humidifier lung.
- Bacteriological analysis of his humidifier revealed the presence of Cryptococcus laurentii.
- Antigen identification tests confirmed C. laurentii as the precipitating antibody antigen.
Findings:
- This case implicates Cryptococcus laurentii as a potential antigen causing humidifier lung.
- The patient was not immunosuppressed, broadening the potential risk factors for humidifier lung.
Implications:
- This study highlights a novel potential cause of humidifier lung in non-immunosuppressed populations.
- Further research is needed to understand the role of C. laurentii in hypersensitivity pneumonitis.
- Clinical awareness of C. laurentii as a humidifier lung antigen may improve diagnosis and management.
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