An older man with a significant history of smoking and alcohol consumption presents with a fever, nonproductive cough, and shortness of breath. Several of his coworkers have had similar symptoms over the preceding months, and his workplace is investigating whether the air conditioner may be a source of infection. He also uses a humidifier in his home. What is the likely diagnosis and organism? How is the organism visualized?

An older man with a significant history of smoking and alcohol consumption presents with a fever, nonproductive cough, and shortness of breath. Several of his coworkers have had similar symptoms over the preceding months, and his workplace is investigating whether the air conditioner may be a source of infection. He also uses a humidifier in his home. What is the likely diagnosis and organism? How is the organism visualized?

An older man with a significant history of smoking and alcohol consumption presents with a fever, nonproductive cough, and shortness of breath. Several of his coworkers have had similar symptoms over the preceding months, and his workplace is investigating whether the air conditioner may be a source of infection. He also uses a humidifier in his home. What is the likely diagnosis and organism? How is the organism visualized?



Answer: Legionella pneumonia (Legionnaires' disease) caused by L. pneumophila. Visualize with silver stain or fluorescence staining


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