ROUTINE laboratory examination of faeces from five infants with diarrhoea who were admitted to a Gastroenteritis Unit, failed to detect Salmonella, Shigella, Campylobacter jejuni, Yersinia enterocolitica, traditional enteropathogenis strains of E. coli, viruses or ova and parasites. Further study of Escherichia coli strains isolated from four of the children showed them to be enterotoxigenic strains, serotype 078 H12, producing both heat-labile and heat-stable enterotoxin.