Pneumonia is a potentially serious infection of one or both of the lungs. It can cause symptoms such as breathing difficulties, fever, chills, and a cough with green or yellow phlegm. The germs that cause pneumonia are usually found in the mouth and nose of the infected person, and they can be spread easily to another person, either through the air or by touching a contaminated surface. Most often, they enter the person's body through the mouth, nose, or eyes.
When the condition is caused by bacteria, antibiotics will be prescribed. Viral pneumonia, however, isn't treated with antibiotics. These medications don't work when a virus causes this illness (an antiviral drug may be recommended instead).
(To read more about this condition, click Pneumonia. Topics discussed in this article include the different types of the illness, how it is diagnosed, and more. You can also click any of the links in the box to the right for specific information.)