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*Microscopically:
 
*Microscopically:
 
**Macrophages +/- multinucleated giant cells
 
**Macrophages +/- multinucleated giant cells
**[[General Pathology - Necrosis#Caseation Necrosis|Caseous necrosis]] and neutrophils
+
**[[Necrosis - Pathology#Caseation Necrosis|Caseous necrosis]] and neutrophils
 
*'''Mycobacterial granulomatous or pyogranulomatous lesions'''
 
*'''Mycobacterial granulomatous or pyogranulomatous lesions'''
 
**Usually caused by [[Mycobacteria spp.|''Mycobacterium lepraemurium'']] (feline leprosy) or other ''Mycobacteria''
 
**Usually caused by [[Mycobacteria spp.|''Mycobacterium lepraemurium'']] (feline leprosy) or other ''Mycobacteria''
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*[[Streptococci|''Streptococcus equi'']]
 
*[[Streptococci|''Streptococcus equi'']]
 
**In horses
 
**In horses
**Immune complex vasculitis -> [[General Pathology - Haemorrhage#Purpura haemorrhagica|purpura]]
+
**Immune complex vasculitis -> [[Haemorrhage - Pathology#Purpura haemorrhagica|purpura]]