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Fibrosis in the lungs of infected pigs. Mild fibrosis with collagen fibers (solid arrow) in the lung of HB-1/3.9-infected pig on day 16 PI (A). Severe distortion of structure and diffuse fibrous areas (solid arrow) in the lung of JXwn06-infected pig (B). No fibrosis in the lung of control pig (C). Bar = 50 μm.
