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Photomicrographs of representative lesions in lung tissues from CDCD pigs experimentally infected animals with Virus X. (A) Interstitial pneumonia with infiltration of mixed but primarily mononuclear cells in interlobular septa as well as interstitial space. (B) Extensive nonsuppurative interstitial pneumonia with congestion. (C and D) Section of normal lung at different magnifications (C) at 100× magnification and (D) at 200× magnification.
