Occurrence: Worldwide.
Age affected: Piglets pre-weaning, weaners (growers / finishers, sows, boars).
Causes: One-celled parasites of the families Cystoisospora (Isospora), Cryptosporidium and Eimeria; poor hygiene.
Effects: Paste-like or watery diarrhoea, stunting, death in piglets.