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Varies from sudden death to recovery depending on the virulence of the strain and age and immune status of the affected pig.
 
Varies from sudden death to recovery depending on the virulence of the strain and age and immune status of the affected pig.
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***Vaccination prevents septicaemic and urticarial forms but has no effect on joints
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****Probably due to dead bacteria still stimulating host immune system
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**Septicaemia lo9calises in meninges and joints
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**Well known in piglets in their first two months of life
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**Expresses as acute '''fibrinopurulent''' arthritis
       
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