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Interstitial pneumonitis, with margination of WBCs along vascular lumen (vessel horizontally transverses section), infiltration of alveolar septa with mixed WBCs (note hypercellularity of alveolar walls), accumulation of macrophages in alveolar spaces, and infiltration of alveolar septa with mixed WBCs in the lung of a C3H mouse at 14 days after WA1 inoculation. Section was stained with hematoxylin and eosin. Magnification, ×110.
