Changes

==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. It is principally of viral origin including[[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]].  Mycoplasmas have also been implemented and secondary bacterial infection  commonly occurs including [[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 causing damage to the respiratory tract. It is principally of viral origin including[[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]].  Mycoplasmas hve also been implemented and secondary bacterial infection  commonly occurs including [[Mannheimia haemolytica|''Manheimia (Pasteurella) haemolytica'' serotype A1]],[[Pasteurella multocida|''Pasteurella multocida'']], [[Arcanobacter pyogenes|''Arcanobacter pyogenes'']] and ''[[Haemophilus somnus]]''.

==Signalment==

==Signalment==

Mainly a problem in calves less than 6 months old particularly affecting 2-10 week old animals primarily a  It also occurs more commonly in dairy calves than in beef calves.

Mainly a problem in calves less than 6 months old and particularly affects 2-10 week old animals. It occurs more commonly in dairy calves than beef calves.

*Range of infectious agents together with managemental and environmental stress cause damage to the respiratory tract

 

 

==History and Clinical signs==

*Causes unthriftiness in animals < 6 months old

*Causes unthriftiness in animals < 6 months old

*Usually the primary pathogen is a virus, secondary pathogens are bacteria and mycoplasmas

*Usually the primary pathogen is a virus, secondary pathogens are bacteria and mycoplasmas