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===''Rhodococcus equi''===
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===''[[Rhodococcus equi]]''===
[[Image:Pyogranulomatous lungs due to Rhodococcus Equi.jpg|right|thumb|100px|<small><center>Pyogranulomatous lesions due to Rhodococcus equi (Image sourced from Bristol Biomed Image Archive with permission)</center></small>]]
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*Causative agent [[Rhodococcus equi|''Rhodococcus (Corynebacterium) equi'']]
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*Important cause of sever, often fatal [[Lungs Inflammatory - Pathology#Granulomatous pneumonia|granulomatous]] [[Lungs Inflammatory - Pathology#Infectious causes of pneumonia|pneumonia]] in foals
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*Clinical signs include depression, cough, weight loss, respiratory distress, diarrhoea, arthritis, subcutaneous abscesses
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*Bacterium survives phagocytosis and multiplies
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*Bacterial toxins -> caseous necrosis in lungs -> attracts inflammatory cells -> pyogranulomatous pneumonia
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*Grossly:
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**Multiple firm nodules, usually no encapsulation
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**Partial [[Lungs Ventilation - Pathology#Atelectasis (Collapse)|atelectasis]]
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*Histologically:
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**Pyogranulomatous lesions
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**Macrophages with ingested microorganisms in the alveoli
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**Necrosis spreading through parenchyma
      
==In Cattle==
 
==In Cattle==
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