<unk>  is an inflammation of the lung caused by a virus. Viruses are the most common cause of pneumonia in children.<unk>  is commonly caused by viruses such as the influenza virus, respiratory syncytial virus (RSV), adenovirus, and metapneumovirus. Herpes simplex virus is a rare cause of pneumonia except in newborns. People with immune system problems are also at risk of pneumonia caused bycytomegalovirus (CMV).
Viral pneumonia
Fungal pneumonia
Bacterial pneumonia
Atypical pneumonia
Community acquired pneumonia
Aspiration pneumonia
Community-acquired pneumonia
Cavitary pneumonia