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  • Food Safety
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        • Cómo Encontrar el Número de Establecimiento del USDA (EST) en el Empaque de Alimentos
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        • Danger Zone 40F - 140F
        • Deep Fat Frying
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        • El Color de la Carne y Las Aves
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        • El Manejo Adecuado de los Alimentos Pedidos Por Correo
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        • Guía del Consumidor Sobre Inocuidad Alimentaria: Tormentas y Huracanes Severos
        • High Altitude Cooking
        • Hongos en los Alimentos: ¿Son Peligrosos?
        • How Temperatures Affect Food
        • How to Find the USDA Establishment Number
        • Importación de Productos Cárnicos, Avícolas y Ovoproductos a Estados Unidos
        • Importing Meat, Poultry & Egg Products US
        • Irradiation and Food Safety FAQ
        • Keeping "Bag" Lunches Safe
        • Keeping Food Safe During an Emergency
        • La Cocción En Elevaciones Altas
        • La Congelación Y Seguridad Alimentaria
        • La Limpieza Ayuda a Prevenir Enfermedades Transmitidas Por Los Alimentos
        • Las Ollas de Cocción Lenta y la Seguridad Alimentaria
        • Las Sobras de Comida e Inocuidad Alimentaria
        • Lavado de Alimentos: ¿Promueve la Inocuidad Alimentaria?
        • Mail Order Food Safety
        • Manipulación Adecuada de Alimentos Para Llevar
        • Mantenga los Alimentos Seguros - Conceptos Básicos de Inocuidad Alimentaria
        • Manteniendo Seguros Los Almuerzos En "Bolsas"
        • Materiales de Empaque para Carnes y Aves
        • Meat and Poultry Labeling Terms
        • Meat and Poultry Packaging Materials
        • Molds on Food: Are They Dangerous?
        • Natural Flavors on Meat and Poultry Labels
        • Preguntas Frecuentes Sobre Irradiación y Seguridad Alimentaria
        • Preguntas y Respuestas Sobre la Seguridad Alimentaria Durante un Tailgate
        • Sabores Naturales de Carnes y Aves en las Etiquetas
        • Safe Handling of Take-Out Foods
        • Seguridad Alimentaria Durante Caminatas, Campamentos y Paseos en Bote
        • Seguridad Alimentaria de Comida No Perecedera
        • Slow Cookers and Food Safety
        • Smoking Meat and Poultry
        • Tabla de Temperatura Interna Mínima Segura
        • Tablas de Cortar
        • Tailgating Food Safety Q & A
        • Termómetros para Alimentos
        • Termómetros para Electrodomésticos
        • Términos de Etiquetado de Carnes y Aves
        • Understanding FSIS Food Recalls
        • Voluntarios Sobre la Seguridad Alimentaria
        • Water in Meat & Poultry
        • Zona de Peligro (40 F - 140 F)
        • Food Product Dating
        • Freezing and Food Safety
        • Leftovers and Food Safety
        • Refrigeration
          • La Refrigeración y Seguridad Alimentaria
        • Safe Temperature Chart
        • Shelf-Stable Food
        • The Big Thaw — Safe Defrosting Methods
        • The Color of Meat and Poultry
        • Washing Food: Does it Promote Food Safety?
        • Food Safety While Hiking, Camping & Boating
      • Meat & Catfish
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        • Bagre de la Granja a la Mesa
        • Beef From Farm To Table
        • Bison from Farm to Table
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        • Cuando se Asan “Otras” Carnes para las Fiestas
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        • Roasting Those "Other" Holiday Meats
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        • Yersiniosis y los Chinchulines (Tripas): Consejos Para Protegerlo de Enfermedades Transmitidas Por Alimentos
      • Poultry
        • Happy Thanksgiving!
        • Amarras para las Aves y Otros Accesorios
        • Aves: Baños en Solución, Salmueras y Marinadas
        • Chicken From Farm to Table
        • Chicken Liver
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        • El Relleno y Seguridad Alimentaria
        • Hablemos Sobre el Pavo: Una Guía Para el Consumidor Sobre Cómo Asar un Pavo de Forma Segura
        • Hock Locks and Other Accoutrements
        • Is Pink Turkey Meat Safe?
        • La Etiqueta del Ave Dice “Fresco”
        • La Preparación de Turduckens Requiere un Manejo Adecuado
        • Let's Talk Turkey Roasting
        • Pato y Ganso de la Granja a la Mesa
        • Pavo de la Granja a la Mesa
        • Pavo: Rutas Alternativas Hacia la Mesa
        • Pollo de la Granja a la Mesa
        • Poultry Processing: Questions & Answers
        • Poultry: Basting, Brining, and Marinating
        • Preparación Básica del Pavo: Cocinar De Forma Adecuada
        • Preparación Básica del Pavo: Como Descongelar Seguramente
        • Preparación Básica del Pavo: El Relleno
        • Preparación Básica del Pavo: Manejo de las Comidas Cocidas
        • Procesamiento de Aves: Preguntas y Respuestas
        • Stuffing and Food Safety
        • The Poultry Label Says "Fresh"
        • Turduckens Require Safe Food Handling
        • Turkey Basics: Handling Cooked Dinners
        • Turkey Basics: Safe Cooking
        • Turkey Basics: Safe Thawing
        • Turkey Basics: Stuffing
        • Turkey from Farm to Table
        • Turkey: Alternate Routes to the Table
        • ¿Es Segura la Carne de Pavo Rosada?
      • Eggs
        • Egg Products and Food Safety
        • Huevos en Cascarón De la Granja a la Mesa
        • Ovoproductos e Inocuidad Alimentaria
        • Shell Eggs from Farm to Table
      • Emergencies
        • A Consumer's Guide to Food Safety: Severe Storms and Hurricanes
        • Eliminando Olores de Refrigeradores y Congeladores
        • Fires and Food Safety
        • Incendios y Seguridad Alimentaria
        • Keep Your Food Safe During Emergencies
        • Removing Odors from Refrigerators and Freezers
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            • Quarterly Sampling Reports on Salmonella
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        • Microbiological Testing Program for Escherichia coli O157:H7 and non-O157 Shiga toxin-producing Escherichia coli (STEC)
          • Year-to-Date Totals: Testing of Raw Ground Beef Component (RGBC) Samples for E. coli O157:H7 and non-O157 Shiga toxin-producing E. coli (STEC)
          • Annual Report for STEC in Raw Ground Beef or Veal and Raw Ground Beef or Veal Components
          • Individual E. coli Positive Results for Raw Ground Beef (RGB) and RGB Components 2017
          • Individual E. coli Positive Results for Raw Ground Beef (RGB) and RGB Components 2018
          • Individual E. coli Positive Results for Raw Ground Beef (RGB) and RGB Components 2016
          • Individual E. coli Positive Results for Raw Ground Beef (RGB) and RGB Components 2015
          • Year-to-Date 2018 Totals: Results of Raw Ground Beef Component (RGBC) Samples for E. coli O157:H7 and non-O157 Shiga toxin-producing E. coli (STEC):
        • Salmonella Verification Testing Program Monthly Posting
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Science Risk Assessments
06/12/1998, 08:00AM EDT

Risk Assessment for Salmonella Enteritidis in Eggs and Egg Products

This document summarizes the risk assessment process from the development of a conceptual framework to the careful organization of information obtained from published scientific literature and unpublished academic, government and industry sources, to the incorporation of available data into a comprehensive quantitative model which characterizes the public health effects associated with the consumption of Salmonella Enteritidis-infected shell eggs and egg products.

The Food Safety and Inspection Service (FSIS) began a comprehensive risk assessment of Salmonella enterica serotype Enteritidis (Salmonella Enteritidis) in December 1996 in response to an increasing number of human illnesses associated with the consumption of shell eggs. The objectives of this risk assessment are to: establish the unmitigated risk of foodborne illness from Salmonella Enteritidis, identify and evaluate potential risk reduction strategies, identify data needs, and prioritize future data collection efforts. The risk assessment model consists of five modules. The first module, the Egg Production Module, estimates the number of eggs produced that are infected (or internally contaminated) with Salmonella Enteritidis. The Shell Egg Module, the Egg Products Module, and the Preparation and Consumption Module estimate the increase or decrease in the numbers of Salmonella Enteritidis organisms in eggs or egg products as they pass through storage, transportation, processing, and preparation. The Public Health Module then calculates the incidences of illnesses and four clinical outcomes (recovery without treatment, recovery after treatment by a physician, hospitalization, and mortality) as well as the cases of reactive arthritis associated with consuming Salmonella Enteritidis positive eggs.

The baseline model for shell eggs presented in this report simulates an average production of 46.8 billion shell eggs per year in the U.S., 2.3 million of which contain Salmonella Enteritidis. The consumption of these eggs results in a mean of 661,633 human illnesses per year ranging from 126,374 to 1.7 million cases per year (5th and 95th percentiles) as shown in Table 3. It is estimated that about 94% of these cases recover without medical care, 5% visit a physician, an additional 0.5% are hospitalized, and 0.05% of the cases result in death. Twenty percent of the population is considered to be at a higher risk for salmonellosis from Salmonella Enteritidis (i.e. infants, elderly, transplant patients, pregnant women, individuals with certain diseases) because they may be more susceptible to infection and because they may disproportionately experience the manifestations of Salmonella Enteritidis infection.

A comparison of the total number of illnesses due to Salmonella Enteritidis positive eggs simulated with this model, with a distribution of illnesses from Salmonella Enteritidis positive eggs predicted from national public health surveillance shows substantial overlap between these two independently derived distributions (see Figure 1). The surveillance data has been used to derive an estimate of Salmonella Enteritidis related human illnesses averaging 637,000 cases per year with a range from 254,000 to 1,167,000 cases of human illness from Salmonella Enteritidis positive eggs. The median estimates for this simulation model and the surveillance data are 504,082 cases and 332,400 cases of human illness from Salmonella Enteritidis positive eggs per year, respectively. Such agreement suggests the model is reasonably accurate in its depiction of the number of cases of human illnesses due to Salmonella Enteritidis positive eggs in the U.S.

Figure 1

The baseline egg products model predicts that the probability is low that any cases of Salmonella Enteritidis will result from the consumption of pasteurized egg products. However, the current FSIS time and temperature regulations do not provide sufficient guidance to the egg products industry for the large range of products the industry produces. Time and temperature standards based on the amount of bacteria in the raw product, how the raw product will be processed, and the intended use of the final product will provide greater protection to the consumers of egg products.

Mitigation elasticity is an indication of how changes in module variables affect model output. For example, a 25 percent reduction in a few input variables were simulated as examples of how this elasticity could be used. No single input variable modeled as a potential mitigation achieved an equivalent reduction (i.e. 25%) in total human illnesses. However, combinations of mitigations may potentially be more effective in reducing total human illnesses (i.e., a Mitigation elasticity  1). In one such combination of mitigations in the Production Module and in the Preparation & Consumption Module an equivalent reduction (i.e. 25%) in human illnesses resulted. This finding implies that a broadly based policy may be more effective than a policy directed solely at one area of the egg production-to-consumption chain.

The percent reduction for total human illnesses was calculated for two scenarios within the Shell Egg Processing and Distribution module. In the first scenario we found a 12% reduction in human illnesses if all eggs are immediately cooled after lay to an internal temperature of 45 F, then maintained at that temperature throughout shell egg processing and distribution as opposed to the current diversity of temperatures experienced throughout this stage of production. In the second scenario we found a 8% reduction in illnesses when eggs are maintained at an ambient (i.e air) temperature of 45 F throughout shell egg processing and distribution compared to current practices. These two scenarios represent the best results that could be expected from implementing temperature strategies during shell egg processing and distribution.

Mitigation elasticity measures the effect of specific interventions. We compared the effect of diverting eggs from Salmonella Enteritidis positive flocks out of the shell egg market and into the egg products market for pasteurization and found a substantial reduction in the number of illnesses.

Some cautions on the appropriate use of this risk assessment are in order. This risk assessment effort is a significant advancement in our ability to comprehensively model risk throughout the egg and egg products continuum. The model can continually be refined and updated for use in future risk assessments for shell eggs and egg products. Furthermore, the farm-to-table approach provides a framework for developing similar risk assessment efforts for other pathogen-product pairs, or for other livestock production systems. However, the risk assessment results provide only part of the information needed by decision makers and regulators. Cost-benefit analyses will need to be applied to the risk assessment results to provide additional information for formulating efficient policy. The risk assessment results detailed in this Final Report will be used by the agency, working in conjunction with economists from within and from outside the agency, to conduct cost-effectiveness studies and cost-benefit analysis in order to set forth recommendations for policy.

Related Media

Executive Summary: Risk Assessment for Salmonella Enteritidis in Eggs and Egg Products
Research Needs: Risk Assessment for Salmonella Enteritidis in Eggs and Egg Products
Public Health Outcomes Module: Risk Assessment for Salmonella Enteritidis in Eggs and Egg Products
Preparation and Consumption Module: Risk Assessment for Salmonella Enteritidis in Eggs and Egg Products
Egg Products Processing and Distribution Module: Risk Assessment for Salmonella Enteritidis in Eggs and Egg Products
Shell Eggs Processing and Distribution Module: Risk Assessment for Salmonella Enteritidis in Eggs and Egg Products
Production Module: Risk Assessment for Salmonella Enteritidis in Eggs and Egg Products
Introduction, Results and Modeling Mitigations: Risk Assessment for Salmonella Enteritidis in Eggs and Egg Products
Last Updated: Jul 05, 2013
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