Changes

**Viruses

**Viruses

*All transmitted by aerosol and direct contact

*All transmitted by aerosol and direct contact

*Gross pathology:

 

**Consolidation of the cranioventral areas which increases in volume with duration

**On cut surface, exudate in the main airway of affected lobules with thickening of the surrounding connective tissue

===Gross pathology===

*Micro pathology:

Consolidation of the cranioventral lung areas which increases in volume with duration.

Exudate is present in the main airway of affected lobules with thickening of the surrounding connective tissue

**Even to proper follicle formation, some of which may be large enough to compress the lumen

 

**Mixed cell exudate in the airway lumen

===Micro pathology===

Even to proper follicle formation, 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.

**Slight thickening of the alveolar walls with lymphocytes[[Category:Cattle]]

[[Category:Cattle]]

[[Category:Respiratory_Bacterial_Infections]]

[[Category:Respiratory_Bacterial_Infections]]

[[Category:To_Do_-_Caz]]

[[Category:To_Do_-_Caz]]