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==Overview==
==Overview==
Disease caused by the parasite [[Cryptosporidium|cryptosporidium]].
Disease caused by the parasite [[Cryptosporidium|cryptosporidium]].
==Diagnosis==
*Faecal smear
**Ziehl-Neelson (ZN) stain
**Oocysts stain red against a blue/green background
*Immunoassays
**Detect oocysts in faeces
==Control==
*Isolate/quarantine bought-in calves
**Treat if signs of [[Diarrhoea|diarrhoea]] present
*Good hygiene, adequate bedding and disinfection of calf pens is important
*Prevention/treatment
**Halofuginone
***Halocur or Intervet
***Oral dosage
==Villus Atrophy in Enteritis==
* Affects calf, lamb, piglet, kitten.
* Increasingly important as part of the neonatal [[Diarrhoea|diarrhoea]] complex in calves.
* Zoonosis.
====Pathology====
=====Gross=====
* Intestines diffusely reddened, with fluid contents.
=====Histological=====
* Tiny parasites on surface of epithelium.
* Villus atrophy and fusion.
* Iinflammation (mainly lymphoid) in crypts and lamina propria.