Chest radiographic findings in a 52-year-old man who presented with pneumonia subsequently diagnosed as Legionnaires’ disease. The patient was a cigarette smoker with chronic obstructive pulmonary disease and alcoholic cardiomyopathy; he had received glucocorticoids. Legionella pneumophila was identified by direct fluorescent antibody staining and culture of sputum. Left: Baseline chest radiograph showing long-standing cardiomegaly. Center: Admission chest radiograph showing new rounded opacities. Right: Chest radiograph taken 3 days after admission, during treatment with erythromycin.

Read more about Legionnaires’ Disease in Context:

Harrison’s Principles of Internal Medicine, 19e: Chapter 184. Legionella Infections

Read more about Legionnaires’ Disease:

CURRENT Diagnosis and Treatment: Pediatrics, 24e: Chapter 42. Infections: Bacterial & Spirochetal

Review of Medical Microbiology & Immunology: A Guide to Clinical Infectious Diseases, 15e: Part X: Brief Summaries of Medically Important Organisms: Introduction

Centers for Disease Control and Prevention: Legionella (Legionnaires' Disease and Pontiac Fever)