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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 usually affects weanlings 6-10 weeks old when maternal antibodies wane but it 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.
The disease is endemic in most herds and has been associated with PRRS, Circovirus and Swine Influenza.