Pneumonia is a lung infection is caused by viruses, bacteria, or fungi. It can occur in one or both the lungs. The infection is characterized by the inflammation of the alveoli (air sacs) in the lungs. As a result of pneumonia, pus or fluid gets filled up in the alveoli, making it difficult to breathe. Pneumonial infection caused by viruses and bacteria is contagious (it can spread from one person to another). Pneumonia can be mild in certain cases and sometimes can become life-threatening. For More Information about the causes symptoms of pneumonia visit A overview of Pneumonia
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