What is the diagnosis for Pneumonia?

Pneumonia is an infection of one or both lungs which is usually caused by bacteria, viruses, fungi, or parasites. Prior to the discovery of antibiotics, one-third of all people who developed pneumonia subsequently died from the infection. Currently, over 3 million people develop pneumonia each year in the United States. Over a half a million of these people are admitted to a hospital for treatment. Although most of these people recover, approximately 5% will die from pneumonia. Pneumonia is the sixth leading cause of death in the United States.

Source: http://www.emedicinehealth.com