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**Changes result from a catarrhal [[Lungs Inflammatory - Pathology#Bronchointerstitial pneumonia|bronchointerstitial pneumonia]]  
 
**Changes result from a catarrhal [[Lungs Inflammatory - Pathology#Bronchointerstitial pneumonia|bronchointerstitial pneumonia]]  
 
**In chronic cases, prominent accumulations of lymphoid cells can be seen around airways and blood vessels[[Category:Pig]]
 
**In chronic cases, prominent accumulations of lymphoid cells can be seen around airways and blood vessels[[Category:Pig]]
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[[Category:Respiratory_Bacterial_Infections]]
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