Changes

*Caused by [[Pasteurella species and Mannheimia haemolytica|''Pasteurella (Manheimia) haemolytica'']], possibly together with [[Mycoplasmas|''Mycoplasma ovipneumoniae'']]

*Caused by [[Pasteurella species and Mannheimia haemolytica|''Pasteurella (Manheimia) haemolytica'']], possibly together with [[Mycoplasmas|''Mycoplasma ovipneumoniae'']]

*Mainly in late spring/early summer after environmental stress i.e. handling or moving

*Mainly in late spring/early summer after environmental stress i.e. handling or moving

*May be acute with producing a fibrinonecrotic [[Bronchi and bronchioles - inflammatory#Infectious causes of bronchitis or bronchiolitis|broncho]][[Lungs - inflammatory#Infectious causes of pneumonia|pneumonia]] and associated [[Pleural cavity and membranes - inflammatory|pleuritis]]

*May be acute with producing a fibrinonecrotic [[Bronchi and bronchioles - inflammatory#Infectious causes of bronchitis or bronchiolitis|broncho]][[Lungs - inflammatory#Infectious causes of pneumonia|pneumonia]] and associated [[Pleural Cavity & Membranes Inflammatory - Pathology|pleuritis]]

*Or tending towards chronicity with abscessation and fibrous pleural adhesions

*Or tending towards chronicity with abscessation and fibrous pleural adhesions

*A septicaemic form (mortality 5%) is reported to follow the stress of movement to new pasture in the autumn in weaned lambs.

*A septicaemic form (mortality 5%) is reported to follow the stress of movement to new pasture in the autumn in weaned lambs.