An outbreak of E. coli O157:H7 in Marin County, CA, has concluded with six confirmed cases. The county’s health department originally reported the outbreak in September, and officials said they have not detected any new cases since the middle of that month. Three of the victims live in Tiburon, and one each live in San Rafael, Inverness and San Anselmo. Four of the victims, two children and two adults, were hospitalized. All patients have been discharged and are either recovering or have fully recovered. County health officials were not able to determine a single food source in the outbreak, but said there is no evidence of a continual threat to county residents. Marin County sees about 10 E. coli O157:H7 cases a year on average. Symptoms of E. coli O157:H7 infection include potentially severe diarrhea, nausea, and abdominal cramping.