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Immunohistochemistry study of lung (case 1)—(× 100, × 400). a (arrows) (× 100) Pancytokeratin-positive hyaline membranes. b (× 400) CD3-positive lymphocytes. c (arrow head) (× 400) CK7-positive giant cell-like pneumocytes aggregates with viral cytopathic effect. d (triangle) (× 400) Type II pneumocyte with viral effect and cytoplasmic inclusions
