Pandemic (H1N1) 2009 Virus in Swine Herds, People’s Republic of China
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.