Pneumonia is a serious illness for anyone. It can be even more serious for the elderly, who are more likely to develop complications and may die from pneumonia. For people with chronic illnesses such as diabetes, lung disease, or heart failure, pneumonia can be very serious or even fatal. Weakened immunity from cancer treatment, HIV/AIDS, or other causes can make pneumonia much more dangerous. Pneumonia is also a serious illness in infants and young children.
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