Changes

==History and Clinical signs==

==History and Clinical signs==

Acutely affected animals:

Acutely affected animals:

Affects a group of calves who display respiratory signs including a dry cough, increased respiratory rate and nasal discharge. Animals are dull and also often anorexic.  

Affects a group of calves who display respiratory signs including a dry cough, increased respiratory rate, nasal  and lacrimal discharge. Animals are pyrexic, depressed and also often anorexic.  

Chronically affected animals:

Chronically affected animals:

Usually affects a group of animals who are kept indoors. The disease is gradual in onset and although respiratory disease is present the animals remain bright and eating.

Usually affects a group of animals who are kept indoors. The disease is gradual in onset and although respiratory signs similar to acutely affected animals are present the animals remain bright and eating.

==Pathology==

==Pathology==