According To (CNN) An outbreak of E. coli made 17 people ill and killed one person across the United States between November 15 and December 8, according to the US Centers for Disease Control and Prevention. Though the source of infection is still unknown, the CDC is investigating leafy greens and romaine lettuce.

Five people have been hospitalized, according to Ian Williams, chief of the CDC's Outbreak Response and Prevention Branch. Two of the hospitalized patients developed hemolytic uremic syndrome, a type of kidney failure.