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*Virulence varies with isolates
*Virulence varies with isolates
*Cessation of [[Respiratory system - general introduction#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 [[Viral infections#Parainfluenza- 3|rhinitis]] of cattle
*May cause [[Viral infections#Parainfluenza- 3|rhinitis]] of cattle
*With other agents causes [[Bacterial infections#Enzootic pneumonia of calves|calf pneumonia ]]
*With other agents causes [[Bacterial infections#Enzootic pneumonia of calves|calf pneumonia ]]