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==Description==

==Description==

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 stress of mixing, weaning and adverse environmental conditions are predisposing factors.

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 stress of mixing, weaning and adverse environmental conditions are predisposing factors.

The disease occurs '''worldwide''', it is endemic in most herds but incidence of clinical disease in the UK is sporadic due to widespread acquired resistance. Increased prevalance has been associated with [[Porcine Reproductive and Respiratory Syndrome|PRRS]], [[Porcine Circoviruses|Circovirus]] and [[Swine Influenza|Swine Influenza.]]  

The disease occurs '''worldwide''', it is endemic in most herds but incidence of clinical disease in the UK is sporadic due to widespread acquired resistance. Increased prevalence has been associated with [[Porcine Reproductive and Respiratory Syndrome|PRRS]], [[Porcine Circoviruses|Circovirus]] and [[Swine Influenza|Swine Influenza.]]  

Mortality is high where there is no immunity, for example outbreaks in specific pathogen-free herds.   

Mortality is high where there is no immunity, for example outbreaks in specific pathogen-free herds.   

[[Category:Respiratory_Bacterial_Infections]]

[[Category:Respiratory_Bacterial_Infections]]

[[Category:To_Do_-_lizzyk]]

[[Category:To_Do_-_lizzyk]]

[[Category:To_Do_-_Review]]

[[Category:Expert_Review]]