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Pneumonia is an infectious lung disease caused by bacteria, viruses, or fungi. It affects the elderly, chronically ill, and young children the most severely. Symptoms include fever, cough, chest pain, and difficulty breathing. Diagnosis involves physical exam, x-rays, and testing sputum or blood samples. Treatment depends on the cause but may include antibiotics, oxygen, or antiviral medications. Vaccination and healthy habits can help prevent pneumonia.










