Epidemiology and Infection · 1999 · 211 citations · 16 references
Veterinary MedicineInfectious DiseasesMicrobiologyFood SafetyFoodborne Disease EpidemiologyOutbreak InvestigationFood ContaminationFoodborne Disease SurveillanceFoodborne InfectionsFoodborne PathogensMicrobial ContaminationSurveillance Of Foodborne IllnessFoodborne Disease PreventionFoodborne Illness EpidemiologyFoodborne Pathogen SurveillanceFoodborne Pathogens On VegetablesReady-to-eat VegetablesSalmonella Contamination In VegetablesSalmonella In FoodsSalmonella Infections
Laboratory surveillance identified multistate salmonella outbreaks in 1990 and 1993, underscoring the challenge of controlling contamination in ready‑to‑eat agricultural commodities such as tomatoes. Contamination likely occurred at the packing shed, where field‑grown tomatoes were dumped into a common water bath. Case‑control studies linked the outbreaks to tomatoes from a single South Carolina packer, illustrating a growing trend of large, geographically dispersed salmonellosis outbreaks caused by sporadic contamination of widely distributed food items.
Laboratory-based surveillance of salmonella isolates serotyped at four state health departments (Illinois, Michigan, Minnesota and Wisconsin) led to the identification of multistate outbreaks of salmonella infections during 1990 (176 cases of S. javiana) and 1993 (100 cases of S. montevideo). Community-based case-control studies and product traceback implicated consumption of tomatoes from a single South Carolina tomato packer (Packer A) MOR 16.0; 95% CI2.1, 120.6; P < 0.0001 in 1990 and again in 1993 (MOR 5.7; 95 % CI 1.5, 21.9; P = 0.01) as the likely vehicle. Contamination likely occurred at the packing shed, where field grown tomatoes were dumped into a common water bath. These outbreaks represent part of a growing trend of large geographically dispersed outbreaks caused by sporadic or low-level contamination of widely distributed food items. Controlling contamination of agricultural commodities that are also ready-to-eat foods, particularly fruits and vegetables, presents a major challenge to industry, regulators and public health officials.
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