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| | Pneumonia - Symptoms, Treatment and Prevention |
 | | Pneumonia-causing bacteria is present in many throats, but when the body's defenses are weakened (for example, by illness, old age, malnutrition or impaired immunity) the bacteria can multiply, working its way into the lungs, inflaming the air sacs and filling the lungs with liquid and pus. |
 | | The bacteria that cause bacterial pneumonia are streptococcus pneumonia (resulting in lobar pneumonia), hemophilus influenza (resulting in bronchopneumonia), legionella pneumophilia (resulting in Legionnaires' disease) and staphylococcus aureus. |
 | | Half of all pneumonias are believed to be caused by viruses, such as influenza (flu), adenovirus, coxsackievirus, chickenpox, measles, cytomegalovirus and respiratory syncytial virus. |
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