Mycobacterium gordonae-induced humidifier lung

Area of Science:

• Pulmonary Medicine
• Microbiology
• Environmental Health

Background:

• Nontuberculous mycobacteria (NTM) are recognized causes of hot tub lung and metal working fluid lung.
• Previously, no cases of humidifier lung induced by mycobacteria have been reported.
• Hypersensitivity pneumonitis is an immune-mediated lung disease triggered by inhaled antigens.

Observation:

• A case of a non-immunocompromised female patient diagnosed with Mycobacterium gordonae-induced humidifier lung.
• The patient experienced acute respiratory distress during a provocation test, consistent with hypersensitivity pneumonitis.
• Mycobacterium gordonae was consistently identified in the humidifier water reservoir before and after the provocation test.

Findings:

• This is the first documented case of humidifier lung caused by NTM.
• The patient demonstrated a hypersensitivity pneumonitis reaction to humidifier use.
• Spontaneous recovery occurred after discontinuing the use of the ultrasonic humidifier.

Implications:

• Physicians should consider NTM as a potential cause of hypersensitivity lung reactions linked to humidifier use.
• This finding expands the known spectrum of diseases caused by NTM.
• Environmental control measures for humidifiers may be important in preventing NTM-related lung disease.