types of pneumonia lungs
Bacterial pneumonia. This type is caused by various bacteria, the most common of which is streptococcus pneumoniae (pneumococcus). It usually occurs when the body is weakened in some way, such as by illness, malnutrition, old age, or impaired immunity, and the bacteria are able to work their way into the lungs.
Pneumonia is an infection of one or both of the lungs. It's caused by bacteria, viruses, fungi, or chemical irritants. Pneumonia is a serious infection or inflammation in which the air sacs fill with pus and other liquid. Lobar pneumonia affects one or more sections (lobes) of the lungs.