Kidney Diseases:
Infectious haematopoietic necrosis (IHN)
Agent IHN virus (Rhabdo-)
Hosts Salmonids.
Location Spleen and interstitial kidney.
Type of lesion Multifocal necrosis of all interstitial components of the kidney. Nephrons usually intact, but the lesions spread rapidly to become diffuse.
Special features  
Diagnosis Characteristic histopathology + isolation and characterization of IHNV. Differential diagnosis include VHS, toxic damage.


IHN affecting kidney of farmed rainbow trout.
Necrosis of interstitial tissue is apparent.