13-Foodborne+Intoxications+_+Infections

13-Foodborne+Intoxications+_+Infections - 1 FST10 GMS/GFR...

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Unformatted text preview: 1 FST10 GMS/GFR 2010 G. M. Smith G. M. Smith (Microbial) Food Safety FST10 GMS/GFR 2010 If Food Isn t Safe It doesnt matter How much there is, How much it costs, How good it tastes, How long it lasts It is toxic How can food be unsafe? FST10 GMS/GFR 2010 Increasing concern by regulatory agencies such as the FDA & CDC Food Hazards Microbiological Nutritional Environmental Natural Toxicants Pesticide Residues Food Additives FST10 GMS/GFR 2010 Food-borne Illnesses Chemical contaminants - (Already done) Natural Toxins - e.g. solanine in potatoes but if its natural, how can it be bad for you? Fungi - e.g. mushrooms, aflatoxins Bacteria- overview in this lecture Viruses- mentioned briefly in FST10 Parasites- mentioned even more briefly in FST10 FST10 GMS/GFR 2010 Estimated Food-borne Illness Per year in U.S. 76 million cases (27,839 cases per 100,000) 375,000 hospitalizations 5,000 deaths frheavens sake, dont write these down Source: (Mead et al., 1999) Food-Borne Pathogens See The Bad Bug Book Started in 1992 by the Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration. Foodborne Pathogenic Microorganisms and Natural Toxins Handbook http://vm.cfsan.fda.gov/~mow/intro.html 2 FST10 GMS/GFR 2010 Microorganisms How do they become hazards in food? FST10 GMS/GFR 2010 Microorganisms Microorganisms yeasts MULTIPLY in food molds bacteria MULTIPLY in food and/or humans (infection) human viruses MULTIPLY in humans not food parasites Complex life cycle bacterial viruses MULTIPLY in bacteria FST10 GMS/GFR 2010 MICROBIAL FOOD POISONINGS Generally two major types of Food-Borne illness: (1) Intoxications (2) Infections FST10 GMS/GFR 2010 (1) FOOD-BORNE INTOXICATIONS Food-borne intoxication (food poisoning) refers to relatively acute illness associated with the consumption of pre-formed microbial toxins in food. The organism must grow in the food, but need not grow in you . FST10 GMS/GFR 2010 Microbial Growth/Survival Growth: Increase in numbers Survival: No increase or decrease in numbers Death: Decrease in numbers FST10 GMS/GFR 2010 Growth of Bacterial Cells Called growth or multiplication Under the best conditions, a cell can divide every 20 to 30 minutes On the next slide we can see what could happen if cells divide every 30 minutes 3 FST10 GMS/GFR 2010 Multiplying Bacteria: 30 minute doubling time 9 a.m. 10 a.m. 11 a.m. 12 p.m. 1 p.m. 2 p.m. 3 p.m. 4 p.m....
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13-Foodborne+Intoxications+_+Infections - 1 FST10 GMS/GFR...

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