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*Virulence varies with isolates
*Virulence varies with isolates
*Cessation of [[Respiratory System General Introduction - Pathology#Mucociliary escalator|ciliary clearance]] and epithelial necrosis predisposes to secondary bacterial infections -> cough
*Cessation of [[Respiratory System General Introduction - Pathology#Mucociliary escalator|ciliary clearance]] and epithelial necrosis predisposes to secondary bacterial infections -> cough
*May cause [[Respiratory Viral Infections - Pathology#Parainfluenza- 3|rhinitis]] of cattle
*May cause rhinitis of cattle
====Diagnosis====
====Diagnosis====
*Diseased lung tissue from dead animals or centrifuged cells from lung lavage
*Diseased lung tissue from dead animals or centrifuged cells from lung lavage