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==Description==
 
==Description==
A pneumonic disease which is caused by a range of infectious agents in combination with management and environmental stress causing damage to the respiratory tract.  
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A pneumonic disease which is caused by a range of infectious agents in combination with management and environmental stress causing damage to the respiratory tract predisposing to disease.  
 
It is principally of viral origin and the following viruses have been implemented in disease. [[Bovine Respiratory Syncytial Virus|Bovine respiratory syncytial virus (BRSV)]], [[Bovine Parainfluenza - 3|Parainfluenza- 3 (PI3)]], [[Flaviviridae|Bovine viral diarrhoea virus (BVDV)]], [[Adenoviridae|Adenoviruses]], [[Coronaviridae|Calf coronavirus]] and [[Infectious Bovine Rhinotracheitis|Bovine herpes viruses]].   
 
It is principally of viral origin and the following viruses have been implemented in disease. [[Bovine Respiratory Syncytial Virus|Bovine respiratory syncytial virus (BRSV)]], [[Bovine Parainfluenza - 3|Parainfluenza- 3 (PI3)]], [[Flaviviridae|Bovine viral diarrhoea virus (BVDV)]], [[Adenoviridae|Adenoviruses]], [[Coronaviridae|Calf coronavirus]] and [[Infectious Bovine Rhinotracheitis|Bovine herpes viruses]].   
 
Mycoplasmas hve also been implemented and secondary bacterial infection is common.  
 
Mycoplasmas hve also been implemented and secondary bacterial infection is common.  
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