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Pneumonia is an infection that inflames the air sacs in one or both lungs, which may fill with fluid or pus, leading to symptoms such as cough, fever, chills, and difficulty breathing. It can be caused by various pathogens, including bacteria, viruses, and fungi. Pneumonia can range from mild to severe and is particularly dangerous for young children, the elderly, and individuals with weakened immune systems. Treatment often involves antibiotics for bacterial pneumonia, along with supportive care.
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