*Seen mainly between 6wks-6mths of age but will affect any age
*Seen mainly between 6wks-6mths of age but will affect any age
*Highly pathogenic strains are capable of initiating disease on their own with high mortality in young pigs
*Highly pathogenic strains are capable of initiating disease on their own with high mortality in young pigs
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*A fibrinonecrotic [[Bronchitis#Infectious causes of bronchitis or bronchiolitis|broncho]][[Pneumonia Overview#Infectious causes of pneumonia|pneumonia]] with [[Pleural Cavity & Membranes Inflammatory - Pathology|pleurisy]]
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*A fibrinonecrotic [[Bronchitis#Infectious causes of bronchitis or bronchiolitis|broncho]][[Pneumonia Overview#Infectious causes of pneumonia|pneumonia]] with [[Pleuritis|pleurisy]]
*Foci of haemorrhagic consolidation or necrosis, mainly around major bronchi, tend to sequestrate
*Foci of haemorrhagic consolidation or necrosis, mainly around major bronchi, tend to sequestrate
*Tending to spread throughout all lung lobes: therefore a cranioventral distribution may not be particularly evident
*Tending to spread throughout all lung lobes: therefore a cranioventral distribution may not be particularly evident