Changes

Chronically affected animals:

Chronically affected animals:

Usually affects  number of animals who are kept indoors. and a number of animals will be

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

==History and Clinical signs==

==History and Clinical signs==

Causes unthriftiness in animals < 6 months old

Causes unthriftiness in animals < 6 months old