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Pneumonia, an inflammation of the lungs caused by an infection. The infection that it is caused by is a bacterial infection. It also, can be caused by viruses, fungi, or by breathing certain harmful chemicals, which irritate the tissues of the lung. Pneumonia can be spreaded through the air, by someone who has it or by something. It isn't that common to catch it in the air but, it can happen. Smoking raises the risk of acquiring pneumonia it is very easy to get in the winter than in the summer.
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