Pneumonia is an infection in the lungs caused by certain types of bacteria, viruses, or (less commonly) fungi. It is often separated into different types based on where the infection occurred and what caused it. For example, the disease can be acquired in the community, in a hospital, or in other healthcare settings. Other types include walking pneumonia and double pneumonia.
Cases that are caused by bacteria can be treated with antibiotics. Viral pneumonia, however, does not respond to antibiotics, so it will be treated differently. The exact amount of time that a person feels sick will vary. It usually takes three to five days before a person with this condition starts to feel better; fatigue and a mild cough can last for a month or more.
(For more information, click Pneumonia. This article takes an in-depth look at this condition, including details on how it is spread, how you can help prevent it, who is at risk, and more. You can also click any of the links in the box to the right for specific information.)