**Acute inflammation affecting pleua, peritoneum, mediastinum, pericardium, joints and meninges
**Acute inflammation affecting pleua, peritoneum, mediastinum, pericardium, joints and meninges
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**Causes a polyserositis - pericarditis, [[Peritoneal cavity - inflammatory#Peritonitis|peritonitis]], pleurisy and meningitis - in pigs 3-10 weeks old
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**Causes a polyserositis - pericarditis, [[Peritoneal Cavity Inflammatory - Pathology#Peritonitis|peritonitis]], pleurisy and meningitis - in pigs 3-10 weeks old