Pneumonia due to with a chronic course resembling non-tuberculous mycobacterial infection.

is a common bacterium that rarely causes pneumonia. Determining whether is the cause of lung infection in patients suspected of having chronic infectious lung disease is challenging because it can present with colonization. We report a case of a 56-year-old immunocompetent woman suspected of having non-tuberculous mycobacteria (NTM) infection on imaging examination and monitored for 3 years. Sputum examinations revealed several times, and it was determined to be a colonization. was isolated from bronchial lavage fluid and aspirated sputum, but no evidence of NTM was observed. She was diagnosed with infection and given ceftazidime for 2 weeks. Her symptoms and imaging findings improved rapidly after treatment, without recurrences. rarely causes chronic lower respiratory tract infections similar to NTM in immunocompetent patients. may be a target for treatment when detected in lower respiratory tract specimens.