This monitored children for growth development and the number of times they had a diarrhoea-related disease or parasite infection.

BBC: Less brainpower hits stunted youth

The symptoms of Johne's Disease are acute weight loss and diarrhoea.

BBC: Crohn's Disease

Crohn's is an inflammatory bowel disease characterised by chronic, sometimes crippling, diarrhoea.

ECONOMIST: Another cow disease with a possible link to humans