A characteristic feature of viral pneumonia is -
The predominant histological pattern in case of viral pneumonia is the interstitial nature of the inflammatory reaction virtually localized within the walls of the alveoli. The infiltrates are usually mononuclear cells such as ­lymphocytes, histocytes, plasma cells
Interstitial mononuclear infiltration
Intra-alveolar proteinaceous exudate
Hyaline membrane lining alveoli
Fibrotic septa