Causes
Protozoa of the genus Eimeria, which are spread through contaminated faeces. Common in hutches with poor hygiene and around weaning (a stressful time).
Diagnosis
Faecal analysis to detect the parasite's oocysts.
Treatment
Specific antiparasitic drugs (toltrazuril, sulphonamides) as prescribed by the vet. Intensive hutch hygiene. In rabbits, any diarrhoea is an emergency.
Prevention
Keep the hutch clean and dry, remove faeces daily, avoid overcrowding, and reduce stress at weaning.

