Etiology: Cryptosporidium muris and Cryptosporidium parvum are one celled, eukaryotic organisms.
Incidence: Incidence of infection is rare.
Transmission: Transmission occurs by ingestion of infective cyst.
C. muris: stomach
C. parvum: small intestine
Clinical signs: Clinical signs range from none to mild enteritis. Clinical signs can be severe in young animals with heavy parasite loads.
Antemortem: Antemortem diagnosis is difficult. A fecal smear can be examined for oocysts.
C. muris oocyst: 7 x 5 µm
C. parvum oocyst: 4-5 x 3 µm
Postmortem: Diagnosis can be made by histopathologic examination of the small intestine. Organisms can be identified within the brush border of intestinal enterocytes (arrow, A.).