A novel serotype of enteropathogenic Escherichia coli (EPEC) as a major pathogen in an outbreak of infantile diarrhoea

An outbreak of infantile diarrhoea was investigated in 32 children, all <2 years old, in the tropical north of Australia, Rotavirus (63%) and enteropa thogenic Escherichia coli (EPEC) (59%) were the most common pathogens ident ified. Of the 19 EPEC isolates, 14 (74%) were of serotype O126:H12, hithert o unreported as an EPEC serotype. Other pathogens isolated included Salmone lla spp. (16%), Campylobacter spp. (3%), Giardia (3%) and Shigella spp. (3% ). EPEC-related gastro-enteritis is an uncommon but recognised cause of dia rrhoeal outbreaks in Australia and clinicians need to be aware of the possi bility of this serotype being implicated. This report highlights the disadv antages of relying on serotyping alone for the recognition of EPEC.