<prompt> A characteristic feature of viral pneumonia is -Interstitial mononuclear infiltrationIntra-alveolar proteinaceous exudateHyaline membrane lining alveoliFibrotic septa  <response>: 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 