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→Pathology
==Introduction==
==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 predisposing to disease.
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)]], [[Bovine Viral Diarrhoea Virus|Bovine viral diarrhoea virus (BVDV)]], [[Bovine Adenovirus|Adenoviruses]], [[Bovine Coronavirus|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)]], [[Bovine Viral Diarrhoea Virus|Bovine viral diarrhoea virus (BVDV)]], [[Bovine Adenovirus|Adenoviruses]], [[Bovine Coronavirus|Calf coronavirus]] and [[Infectious Bovine Rhinotracheitis|Bovine herpes viruses]].
'''Micro pathology''':
'''Micro pathology''':
Even to proper follicle formation is present, some of which may be large enough to compress the lumen.
Even though proper follicle formation is present, some of which may be large enough to compress the lumen.
A mixed cell exudate will be present in the airway lumen and substantial lymphoid tissue will be present around the airways. The alveolar walls may be thickened with [[Lymphocytes - Introduction|lymphocytes]].
A mixed cell exudate will be present in the airway lumen and substantial lymphoid tissue will be present around the airways. The alveolar walls may be thickened with [[Lymphocytes - Introduction|lymphocytes]].
Merck & Co (2008) '''The Merck Veterinary Manual''' (Eighth Edition) ''Merial ''
Merck & Co (2008) '''The Merck Veterinary Manual''' (Eighth Edition) ''Merial ''
{{review}}
[[Category:Respiratory Diseases - Cattle]]
[[Category:Respiratory Diseases - Cattle]]
[[Category:Respiratory_Bacterial_Infections]]
[[Category:Respiratory_Bacterial_Infections]]