Foodborne Illness Outbreaks and Sprouts FDA Public Meeting: 2005 Sprout Safety May 17, 2005 Amy Dechet, M.D. Foodborne and Diarrheal Diseases Branch Centers for Disease Control and Prevention, Atlanta, GA

76 million illnesses 325,000 hospitalizations 5,000 deaths Annual Burden of Foodborne Illness in the United States Mead et.al., 1999, EID

 76 million cases annually means: 1 in 4 Americans ill 1 in 1000 Americans hospitalized ≥ $6.5 billion in medical and other costs What Does This Really Mean?

Foodborne Outbreak Surveillance  Local and state health departments Detect, investigate, and control outbreak  CDC Collect reports: # of cases, implicated food, etiology Define an outbreak: 2 or more cases of a similar illness resulting from the ingestion of a common food  Reporting Voluntary and incomplete

Foodborne Outbreaks Reported to CDC, By states to the Foodborne Disease Outbreak Surveillance System Enhanced surveillance

Produce Associated Outbreaks Reported to CDC *  249 outbreaks  6% of outbreaks with reported food source  13% of outbreak-associated cases  Implicated produce  Generic or multiple:144 outbreaks  Lettuce:22  Sprouts:14  Juice:10  Melon:9  Tomato:8  Berries:6  Other produce:36 67% of outbreaks with single vehicle (*Preliminary information)

Produce Item, Outbreaks, Consumption Produce# outbreaks% population eating item ( ) (FoodNet Survey 2002) Lettuce22 73% Sprouts14 8% (“stealth” vehicle) Juice % Melon % Tomato8 68% Berries %

Sprouts: Where Does Contamination Occur? Multiple opportunities for contamination from farm to table –Field: grazing animals –Mixing: same harvest machinery and processing facilities –Scarification: bacteria enters seed –Transport: many steps along the way

Sprouts: Bacterial Growth, Detection, and Elimination Sprouting: warm, moist environment perfect for bacterial growth –2-4 log increase in CFU/gram Difficult to detect pathogens –Non-homogenous distribution –Low-level contamination Rarely washed or cooked by consumer

Sprouts: Why They Are Unique Multiple pathogens implicated in outbreaks –Salmonella: Typhimurium, Mbandaka, Saintpaul, Muenchen, Enteritidis, Kottbus, Chester, Cubana, Bovismorbificans –E. coli: O157:H7, O157:non-motile Multiple kinds of sprouts –alfalfa, mung bean, clover, broccoli, etc. International partners

Sprout Outbreaks by Year

Alfalfa Sprout Outbreaks by Year (N=26)

Alfalfa Sprout Outbreaks by Year FDA advises chlorination of seeds

Alfalfa Sprout Outbreaks and Compliance with FDA Guidelines by Year FDA advises chlorination of seeds

Average Size Outbreak by Year # of Outbreaks # of CasesMean # of Cases 19984> Unknown

Produce Item, Outbreaks, Consumption Produce# outbreaks% population eating item ( ) (FoodNet Survey 2002) Lettuce22 73% Sprouts14 8% (“stealth” vehicle) Juice % Melon % Tomato8 68% Berries %

Using Outbreaks to Observe the Effect of Interventions: Juice-Associated Outbreaks, * Juice Labeling reg *National foodborne outbreak reporting system, 2004 data preliminary Juice HACCP reg Apple juice or cider Orange juice Lemonade Other juice

Conclusions  Sprout-associated outbreaks represent a small proportion of foodborne outbreaks  Sprouts are one of the most common vehicles identified in produce-associated outbreaks  Current practices are not adequate to prevent disease from sprouts  Outbreak surveillance offers opportunities for tracking effectiveness of interventions

Thank you!

Alfalfa Sprout Outbreaks and Consumption by Month