Changes

*It has been occasionally reported in young or immunosuppressed animals (e.g. Arabian foals with [[Equine Severe Combined Immune Deficiency|congenital immunodeficiency]])

*It has been occasionally reported in young or immunosuppressed animals (e.g. Arabian foals with [[Equine Severe Combined Immune Deficiency|congenital immunodeficiency]])

*Grossly:

*Grossly:

**Diffuse [[Lungs Inflammatory - Pathology#Interstitial pneumonia|interstitial]] [[Lungs Inflammatory - Pathology#Infectious causes of pneumonia|pneumonia]]  

**Diffuse [[Interstitial Pneumonia|interstitial]] [[Pneumonia Overview#Infectious causes of pneumonia|pneumonia]]  

**Patches of firmness or consolidation

**Patches of firmness or consolidation

*Histologically:

*Histologically: