Q:

Can you catch pneumonia from someone else?

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Quick Answer

About.com explains that there are five main causes for pneumonia and at least one of them is contagious. Pneumonia is an inflammation of lung tissue produced by a viral, bacterial, fungal or mycoplasma infection. While viral and bacterial infections do not cause pneumonia in other people, mycoplasma pneumonias are contagious.

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Full Answer

Both WebMD and About.com mention that pneumonia appears more frequently in people with a weak or compromised immune system. Accordingly, cigarette smokers, alcoholics, the elderly, young children and people suffering from other diseases are at a greater risk. Viruses and bacteria may spread and cause respiratory problems even in healthy people, but these don't usually develop into pneumonia. Finally, chemical pneumonia is never contagious.

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