Changes

==Description==

==Description==

A pneumonic disease which is principally of viral origin although mycoplasmas have also been implemented, which are mildly pathogenic unless secondary bacterial infection occurs. In calves a number of infectious agents are involved in the disease. These include [[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]], [[Infectious Bovine Rhinotracheitis|Bovine herpes viruses]]. [[Mannheimia haemolytica|''Manheimia (Pasteurella) haemolytica'' serotype A1]],[[Pasteurella multocida|''Pasteurella multocida'']], [[Arcanobacter pyogenes|''Arcanobacter pyogenes'']] and ''[[Haemophilus somnus]]''.

A pneumonic disease which is caused by a range of infectious agents in combination with management and environmental stress which causes damage to the respiratory tract. It is principally of viral origin although mycoplasmas have also been implemented which are mildly pathogenic unless secondary bacterial infection occurs. In calves a number of infectious agents are involved in the disease. These include [[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]], [[Infectious Bovine Rhinotracheitis|Bovine herpes viruses]]. [[Mannheimia haemolytica|''Manheimia (Pasteurella) haemolytica'' serotype A1]],[[Pasteurella multocida|''Pasteurella multocida'']], [[Arcanobacter pyogenes|''Arcanobacter pyogenes'']] and ''[[Haemophilus somnus]]''.