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Transcript
COMPLIMENTARY TEACHING MATERIALS MICROBIAL FOOD SAFETY A FOOD SYSTEMS APPROACH Charlene Wolf-Hall and William Nganje Chapter 9: Viruses and Prions COMPLIMENTARY TEACHING MATERIALS Key Questions What is a virus? What is a prion? What viruses and prions are of most concern for microbial food safety? What controls can prevent foodborne illness due to viruses and prions? COMPLIMENTARY TEACHING MATERIALS Viruses and Prions Not Alive? – Require a host biochemical machinery to replicate – Border between chemistry and life – Infectious agents COMPLIMENTARY TEACHING MATERIALS Hepatitis A Virus Infects humans and primates COMPLIMENTARY TEACHING MATERIALS Noroviruses Virus Viral Infection – Fecal-oral transmission – Low infectious dose - ~18 particles – Vomiting and diarrhea COMPLIMENTARY TEACHING MATERIALS Rotavirus Virus Viral Infection – Fecal-oral transmission – Low infectious dose - ~10 particles – Vomiting and diarrhea COMPLIMENTARY TEACHING MATERIALS Prions Proteinaceous, infectious particles Infection - transmissible spongiform encephalopathies – Proteins that can remain biologically active through varying environmental and processing conditions – Deadly neurodegenerative disease • Scrapie in sheep • Chronic wasting disease (CWD) in deer • Bovine spongiform encephalopathy (BSE) in cattle; also known as mad cow disease • Creutzfeldt-Jakob disease (vCJD) in humans COMPLIMENTARY TEACHING MATERIALS THANK YOU Name: Charlene Wolf-Hall & William Nganje Email: [email protected] & [email protected] COMPLIMENTARY TEACHING MATERIALS