“The Foodborne Diseases Active Surveillance Network (FoodNet) conducts active population-based surveillance in ten areas (Connecticut, Georgia, Maryland, Minnesota, New Mexico, Oregon, Tennessee, and selected counties in California, Colorado, and New York) for laboratory-confirmed cases of infection caused by Campylobacter, Cryptosporidium, Cyclospora, Listeria, Salmonella, Shiga toxin-producing Escherichia coli (STEC, including STEC O157 and STEC non-O157), Shigella, Vibrio, and Yersinia. FoodNet also conducts surveillance for postdiarrheal hemolytic uremic syndrome (HUS), a complication of STEC infection characterized by renal failure and microangiopathic hemolytic anemia, through a network of pediatric nephrologists and infection-control practitioners. Hospital discharge data are reviewed to validate HUS diagnoses and verify the presence of diarrhea in the 21 days before HUS onset. This report, 2011 Preliminary FoodNet Data – contains preliminary postdiarrheal HUS data for 2010, rather than for 2011, because additional time is needed to review hospital records.”