Figure. Hematoxylin and eosin–stained trachea and lung controls and samples from pigs infected with pandemic (H1N1) 2009 virus. A) Control trachea sample; B) mixed inflammatory cell infiltrate present throughout trachea sample from infected pig. C) Control lung sample; D) mixed inflammatory infiltrate and interstitium broadening in lung sample from infected pig. Original magnifications: panels A and B, ×40; panels C and D, ×10.
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