A restaurant-associated outbreak of E. coli O157 infection.

An outbreak of haemorrhagic colitis due to Escherichia coli O157 and associated with a restaurant in Lothian, occurred in September 1990. There were 16 symptomatic cases, four of whom (all children) required dialysis. Notable features of the outbreak were the wide range of incubation periods (1-14 days), the occurrence of secondary spread through asymptomatic carriers and the prolonged period (at least seven days) during which the restaurant appears to have been the source of infection. Despite careful investigation, no single source within the restaurant was identified. The implications for public health are discussed.