Pneumonia is a lung infection that can be caused by a number of different organisms, including bacteria, viruses, and fungi. It happens when your immune system isn't able to prevent these organisms ...

For the second half of the 19th century and the early part of the 20th, pneumonia was a leading cause of death that killed hundreds of thousands of people. Sir William Osler – usually considered the ...

Pneumonia is a common lung infection that can make breathing difficult and, in some cases, become life-threatening. It happens when the air sacs in the lungs fill with fluid or pus. Each year, about ...

A type of pneumonia infection that’s increasing in the U.S. prompted a warning from the Centers for Disease Control and Prevention (CDC). Mycoplasma pneumoniae (M. pneumoniae) is a type of bacteria ...