10/20/2017 Learning Objectives Food 1.Use basic biochemical characteristics to identify Salmonella 2.Understand what conditions in foods favor Salmonella growth Chapter14 AN INTRODUCTION 3.Recognize,from symptoms and time of onset,a case of foodborne illness caused by Salmonella Salmonella species 4.Choose appropriate interventions(heat, preservatives,and formulations)to prevent the growth of Salmonella 5.Identify environmental sources of Salmonella 6.Understand the roles of Salmonella toxins and virulence factors in causing foodborne illness Outbreak Outbreak Cheesy chicken and rice frozen entrees Cheesy chicken and rice frozen entrees Spring and summer 2010 Frozen dinners can be cooked in ovens -Unopened packages revealed contamination Most prefer to use the microwave to heat with Salmonella enterica serovar Chester such meals EMLE团 -DNA fingerprint identical to the outbreak Spring and summer 2010 strain -44 cases of salmonellosis Heating meals in microwave ovens due to improperly cooked may not heat foods thoroughly cheesy chicken entre Microwaves vary in strength -40%of patients were hospitalized Microwaves cook foods unevenly No deaths reported Food should reach an internal temperature of 1650F10/20/2017 1 Chapter 14 Salmonella species Learning Objectives 1. Use basic biochemical characteristics to identify Salmonella 2. Understand what conditions in foods favor Salmonella growth 3. Recognize, from symptoms and time of onset, a case of foodborne illness caused by Salmonella 4. Choose appropriate interventions (heat, preservatives, and formulations) to prevent the growth of Salmonella 5. Identify environmental sources of Salmonella 6. Understand the roles of Salmonella toxins and virulence factors in causing foodborne illness Outbreak Cheesy chicken and rice frozen entrées • Frozen dinners can be cooked in ovens • Most prefer to use the microwave to heat such meals • Spring and summer 2010 – 44 cases of salmonellosis - due to improperly cooked cheesy chicken entré - 40% of patients were hospitalized - No deaths reported Outbreak Cheesy chicken and rice frozen entrées • Spring and summer 2010 - Unopened packages revealed contamination with Salmonella enterica serovar Chester - DNA fingerprint identical to the outbreak strain • Heating meals in microwave ovens may not heat foods thoroughly • Microwaves vary in strength • Microwaves cook foods unevenly • Food should reach an internal temperature of 165OF