In an investigation notice issued by the Centers for Disease Control and Prevention posted November 23rd, the Agency is actively investigating an outbreak of E.coli O157:H7 outbreak.  Since October 28th, 16 cases were added to the investigation with  acurrent total of 30 confirmed patients.  The cases involve three outbreaks in 18 states.

As yet no specific vehicle of infection has been identified, although a high proportion of the patients interviewed recollect consuming romaine lettuce, iceberg lettuce, bagged lettuce or spinach.  Based on the lack of specific information, the CDC is not advising consumers to avoid any particular food or brand at this time.  Of 30 documented cases, 19 required hospitalization and four developed hemolytic uremia syndrome.  Cases ranged from one to 85 years in age with 62 percent female. 

On Saturday, November 21st Dole Fresh Vegetables Inc. recalled branded three-pack organic romaine hearts in addition to Wild Harvest organic romaine hearts.  According to the company the recall relates to possible health risks from E.coli identified on the two products that were harvested and packed four weeks ago and distributed among 15 states.  The recall was triggered by the Michigan Department of Agriculture and Rural Development after identifying E.coli on a routine sample collected at retail, although this isolate was characterized as non-O157:H7 serotype.

People infected with the outbreak strain of E. coli O157:H7, by date of illness onset*