The disease can be classified by being either community-acquired, hospital acquired with some of those being ventilator associated pneumonias, or aspiration pneumonias.

可以分为通过社区获得性、医院获得性（其中一些是呼吸机相关肺炎）或是吸入性肺炎。

Another category of pneumonia is ventilator associated pneumonia, which is a subset of the hospital-acquired pneumonia, but it specifically develops when ill individuals are connected to a ventilator.

另一类肺炎是呼吸机相关肺炎，这是医院获得性肺炎的一个分支，但它是在病人与呼吸机相连的特别情况下发展的。