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Pulmonology / Respiratory

Legionella pneumophila (Legionnaires' Disease)

ICD-10 Code
J12.81

Clinical Criteria for Legionella pneumophila (Legionnaires' Disease).

Clinical Presentation & Protocol

Patient Usually Complains Of

Patient presents with a several-day history of high-grade fever, non-productive cough, and progressive dyspnea. Associated symptoms include malaise, myalgia, headache, and gastrointestinal distress (diarrhea/nausea). No known recent travel or exposure to aerosolized water sources reported. Symptoms consistent with atypical pneumonia.

Clinical Examination Findings

Vitals: Febrile, tachypneic, hypoxic on room air. HEENT: Moist mucous membranes. Pulmonary: Bilateral crackles/rales, diminished breath sounds at bases. Cardiac: Tachycardia, regular rhythm, no murmurs. Abdominal: Mild epigastric tenderness, bowel sounds present. Neurological: Alert and oriented, mild confusion noted.

Treatment Protocol

Initiate empiric antibiotic therapy with a respiratory fluoroquinolone (e.g., Levofloxacin) or a macrolide (e.g., Azithromycin). Monitor renal function and electrolyte levels (hyponatremia). Provide supplemental oxygen to maintain SpO2 >92%. Supportive care including IV hydration and antipyretics.

Detailed clinical guide coming soon.