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*[[Erysipelothrix rhusiopathiae|'''''Erysipelothrix rhusiopathiae''''']]
 
*[[Erysipelothrix rhusiopathiae|'''''Erysipelothrix rhusiopathiae''''']]
**Most important and most common cause of arthritis
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**Causes '''chronic serofibrinous polyarthritis'''
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**Also causes '''discospondylitis'''
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***Similar to [[Joints Inflammatory - Pathology#In Dogs|discospondylitis in dogs]]
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**Thickening of synovial membrane lining + plus hyperaemia and villus formation + lymphocyte and plasma cell infiltration
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**Acute stage
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***Increased joint fluid + hot swollen joints
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***Also expresses as septicaemic and urticarial lesion on the back (diamond shaped)
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***May involve [[Endocarditis|endocarditis]] as a sequel
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**Chronic stage
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***More commonly encountered
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***Erosion of articular surface of joints with formation of [[Musculoskeletal Terminology - Pathology|pannus +/- joint ankylosis]]
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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
   
*'''''[[Corynebacterium pyogenes]]''''' and [[:Category:Staphylococcus species|'''''Staphylococci''''']]
 
*'''''[[Corynebacterium pyogenes]]''''' and [[:Category:Staphylococcus species|'''''Staphylococci''''']]
 
**Cause purulent arthritis
 
**Cause purulent arthritis
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