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==Signalment==
==Signalment==
The disease usually affects weanlings 6-10 weeks old but can affect pigs of any age, particularly naive pigs introduced into a herd or through exposure to a strain to which there is little immunity.
The disease is endemic in most herds and has been associated with PRRS, Circovirus and Swine Influenza.
==Diagnosis==
==Diagnosis==
===Clinical signs===
===Clinical signs===
*Pyrexia
*Dyspneoa with abdominal effort
*Cough
*Swollen joints and arthritis
*CNS signs, Trembling and paddling
*Sudden death
===Pathology===
===Pathology===