The Oklahoma State Department of Health (OSDH) reports this weekend that at least 176 persons have become ill as a result of the E. coli O111 outbreak in northeastern Oklahoma. Cases include 128 adults and 48 children. Federal and state health officials say E. coli O111 is a rare type not normally associated with an outbreak this large. OSDH disease investigators, along with staff from Tulsa Health Department and area local county health departments, have interviewed more than 450 persons in an effort to identify the source of the outbreak. Interviews continue this weekend. While the source has not yet been identified, health officials continue to focus on the Country Cottage restaurant in Locust Grove, OK, after interviews with cases indicated most had eaten there during the time period Aug. 15 through Aug. 23.

The restaurant is closed while the investigation continues. Not all persons who ate at the restaurant have become ill. No other restaurant or food service outlet in the area has been linked to the outbreak. OSDH laboratory analysis of water samples taken from a private well on the restaurant property has cleared the well water as  the source of the outbreak.

Prior Outbreaks of E. coli O111:

Community Outbreak of Hemolytic Uremic Syndrome Attributable to Escherichia coli O111:NM — South Australia, 1995

Outbreak of diarrhoea due to Escherichia coli O111:B4 in schoolchildren and adults: association of Vi antigen-like reactivity

Escherichia coli O111:H8 Outbreak Among Teenage Campers – Texas, 1999

Outbreaks of food poisoning in adults due to Escherichia coli O111 and campylobacter associated with coach trips to northern France