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==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)]] - can be primary, causes suppression of pulmonary immune response
***[[Bovine Parainfluenza - 3|Parainfluenza- 3 (PI3)]] - can be primary, causes suppression of pulmonary immune response
***[[Flaviviridae|Bovine viral diarrhoea virus (BVDV)]] - suppression of pulmonary immune response
***[[Adenoviridae|Adenoviruses]]
***[[Coronaviridae|Calf coronavirus]]
***[[Infectious Bovine Rhinotracheitis|Bovine herpes viruses]]
**Bacteria
***[[Mannheimia haemolytica|''Manheimia (Pasteurella) haemolytica'' serotype A1]]
***[[Pasteurella multocida|''Pasteurella multocida'']]
***[[Arcanobacter pyogenes|''Arcanobacter pyogenes'']]
***''[[Haemophilus somnus]]''
***''Ureaplasma'' sp.
***''Ureaplasma'' sp.
**Viruses
**Viruses
*All transmitted by aerosol and direct contact
*All transmitted by aerosol and direct contact
*Gross pathology:
*Gross pathology: