Can hypostatic pneumonia be caused by an infection? or would this be highly unlikely?

Definition pneumonia: =inflammatory response within lungs; the lung alveoli become filled with fluid/pus (water with many white blood cells) in response to presumed viral or bacterial infection. Hypostatic modifier refers to this occurring within the posterior (dorsal) portions of someones lungs who has been in a supine position for extended periods, e.g. hospital bed. Less activity=less clearance of lung irritants.