• Most viral and mycoplasmal pneumonias cause interstitial accumulation of lymphocytes

• CMV (cytomegalovirus) can be identified easily since it causes enlargement of infected cells which contain single larger intranuclear and multiple small intracytoplasmic inclusions

• Identification of other viruses usually depends on serologic studies and cultures

Legionella
Legionella
CMV lung
CMV lung
Pathogen/Interstitial pneumonitis
Interstitial pneumonitis