Etiology:  Klossiella muris is a coccidian of mice.

Incidence: Incidence of infection is rare.

Transmission: Transmission occurs via ingestion of sporulated oocysts that have been passed in the urine.

Distribution:  Klosiella muris is found in the kidney [seen at 20X (photo on left), and 40X (photo on right)].

Clinical signs: Clinical signs are not usually observed.

Diagnosis: Diagnosis is made by histopathologic examination of kidney.  Intracellular organisms can be observed within the cells of the renal tubular epithelium.