American Journal of Medical Case Reports
ISSN (Print): 2374-2151 ISSN (Online): 2374-216X Website: Editor-in-chief: Samy, I. McFarlane
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American Journal of Medical Case Reports. 2021, 9(1), 18-21
DOI: 10.12691/ajmcr-9-1-6
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Legionella Causing Lung Abscess in an Immunocompetent Patient

Rohan Madhu Prasad1, , Fazal Raziq1, Tyler Kemnic1, Muhammad Nabeel1 and Madeeha Ghaffar2

1Department of Internal Medicine, Michigan State University - Sparrow Hospital, Lansing, Michigan, United States

2Bachelors of Science, Fatima Jinnah Medical University, Lahore, Pakistan

Pub. Date: October 25, 2020

Cite this paper:
Rohan Madhu Prasad, Fazal Raziq, Tyler Kemnic, Muhammad Nabeel and Madeeha Ghaffar. Legionella Causing Lung Abscess in an Immunocompetent Patient. American Journal of Medical Case Reports. 2021; 9(1):18-21. doi: 10.12691/ajmcr-9-1-6


Legionella lung abscess (LLA) is known to develop from pneumonia and Legionnaires’ disease in immunocompromised patients and aspiration. Literature review showed reports of aspiration pneumonia in immunocompetent patients; however, no such was found between LLA and immunocompetency. A 53-year-old male with history of depression and paraumbilical hernia presented for chest pain, which was right sided, started acutely, constant, radiated to the back, and exaggerated with taking deep breaths. The patient denied all other symptoms. Social history was only pertinent for being an active 35 pack-year smoker. The patient was recently admitted one month ago for viral meningitis from Echovirus. On physical exam, the patient was vitally stable, had absent breath sounds in the right middle lobe, and was significantly tender at the right anterior chest. Labs revealed elevated sedimentation rate and C-reactive protein. Imaging demonstrated a right middle lobe lung abscess. Throughout the hospital course, Legionella pneumophila serogroup 1 (LPS1) was found to be positive on urine antigen, sputum polymerase chain reaction, and sputum cultures. The patient was switched to intravenous levofloxacin and ampicillin-sulbactam. Upon symptomatic resolution, the patient was discharged home with recommendations for a follow-up chest computed tomography and diagnostic bronchoscopy. We hypothesize that smoking causes neutrophilic stasis within the lung and the development of the LLA. Treatment includes intravenous long term antibiotics and possibly drainage.

case report Legionella pneumophila infection lung abscess Immunocompetence cigarette smoking

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