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Example right lateral radiographs from vaccine-challenge study dogs. (A) Normal lungs (score = 0) [100 K PB]; (B) interstitial infiltrates in a hilar pattern with moderate hilar lymphadenopathy (arrow) (score = 11) [100 K P]; (C) moderate, diffuse reticulonodular infiltrates with severe hilar lymphadenopathy (arrow) and enlarged sternal lymph node (score = 21) [Control].
