The differential diagnosis for a patient presenting with a fever and productive cough with bloody sputum would likely include

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The combination of fever, productive cough, and bloody sputum is suggestive of a respiratory infection. Tuberculosis and Legionellosis are both bacterial infections that can cause these symptoms. Walking pneumonia and Pseudomonas pneumonia are also possible, but the presence of bloody sputum leans more towards tuberculosis or Legionella. Inhalation anthrax and diphtheria are less likely causes as they are rare and typically do not present with bloody sputum. Whooping cough can also cause coughing fits with bloody sputum, but it typically presents with a "whoop" sound during coughing and is less likely in adults.

The Differential Diagnosis for a Patient Presenting with a Fever