Microorganisms_in_Foods_3._09 - Microorganisms and Their...

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Microorganisms and Microorganisms and Their Role in Foods III Their Role in Foods III
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Biological Hazards Biological Hazards Pathogenic bacteria Bacterial toxins Parasites Viruses
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Foodborne Illnesses Foodborne Illnesses Classified into three main types: Intoxications Infections Toxin-mediated infections (toxico-infections or intoxifications)
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Bacterial Intoxications Bacterial Intoxications Staphylococcus aureus Clostridium botulinum Bacillus cereus (vomiting type)
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Infections Infections Can be caused by eating food containing LIVING PATHOGENIC MICROORGANISMS
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Bacterial Bacterial Infections Infections Salmonella spp. Shigella spp. Listeria monocytogenes Vibrio spp. (except cholerae ) Yersinia enterocolitica
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Toxin-Mediated Infections Toxin-Mediated Infections (Intoxifications) (Intoxifications) Result from eating food that contains certain types of bacteria that PRODUCE A TOXIN(S) IN THE HUMAN INTESTINES.
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Toxin-Mediated Infections Toxin-Mediated Infections (Intoxification) (Intoxification) Bacillus cereus (diarrheal type) Clostridium perfringens Escherichia coli O157:H7 Vibrio cholerae
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Escherichia coli Escherichia coli Discovered by Dr. Theodor Escherich in 1865 Part of the normal microbial flora of the intestinal tract of humans and other warm blooded animals Most strains that colonize the human intestinal tract are harmless
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Plays an important role in maintaining intestinal physiology Its presence in water supplies indicates fecal contamination and the potential presence of enteric pathogens A few strains are pathogenic and cause distinct diarrheal illnesses
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E. coli O157:H7 E. coli O157:H7 First identified as a human pathogen in 1982 Two outbreaks occurred in Oregon and Michigan where 47 people developed hemorrhagic colitis Illnesses linked to ingestion of hamburgers from the same fast-food restaurant chain The organism were isolated from patients and ground beef patties
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Facts about E. coli O157:H7
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Microorganisms_in_Foods_3._09 - Microorganisms and Their...

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