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FoodMicroLecture 11

Food Micro Midterm 2

How do viruses function? They utilize host cell machinery to replicate an autonomously evolving genome and spread to a new host.
What is located in the virus "package"? Capsid, envelope, structural proteins
What is located in the virus "payload"? DNA, RNA, accessory proteins
What are the 4 steps in virus infection? 1. Virus enters cell body, releases RNA 2. Virus RNA invades the cell nucleus and takes over 3. Viral RNA uses cell machinery to create more virus 4. New viral particles released, sometimes lysing cells
T or F: Human enteric viruses are non-enveloped. True
Human enteric viruses are transmitted via the ____-____ route and initiated in the _____. fecal-oral, intestines
What conditions are viruses resistant to different than most bacteria? Chilling, freezing, preservatives, low pH
T or F: Viruses can multiply in foods. False
What genogroups of norvirus can affect humans? I, II, IV
What is the reservoir for norovirus? Human feces or vomit
What is a food source of Hepatitis A virus? Contaminated shellfish
Hepatitis A is mostly spread by ____-____ contact. person-person
T or F: Hepatitis A has a long incubation period. True
Rotavirus can cause _____. diarrhea
Rotavirus commonly affects _____ populations. infant
T or F: A high dose of virus is needed for infection. False
T or F: Norovirus will not grow on human host cells in the lab. True
What are two processing methods to help prevent viral contamination? HPP, pulsed light UV, cooking, irradiation
How does HPP kill viruses? Denatures their proteins an enzymes; disrupts the permeability of membranes
Created by: goberoi



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