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Specific postnatal pneumonias (Measles (Squamous metaplasia of airways,…
Specific postnatal pneumonias
RSV
Most common cause
Air trapping with bronchiolitis causing narrowing and blockage of lumen
Destruction of terminal bronchiolar epithelium
May see viral inclusions
Formation of regenerative micro polyps
Measles
Squamous metaplasia of airways
Vascular thrombosis
Secondary infection in half of fatal cases
Diffuse alveolar damage
Rare in vaccinated populations
Multinucleate giant cells with inclusions in alveolar walls
Adenovirus
Peribronchial lymphocytes
Mononuclear interstitial inflammation
Necrotising bronchiolitis with intranuclear inclusions
Herpes
Pseudomembranes
Viral inclusions
Mucosal ulceration
Focal necrotising pneumonia
Necrotising tracheobronchitis
CMV
Necrotising pneumonia
Diffuse alveolar damage
Chronic interstitial pneumonitis