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Microorganism Small, living organism
Pathogen Disease-causing microorganism
Toxin Poison
Spoilage Microorganism Microorganism that causes spoilage, but not illness spoilage, but not illness
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Microorganisms That Can ContaminateFood and Cause Foodborne Illness
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Living, single-celled
Can be carried by food, water, soil, humans, or insects
Can reproduce rapidly under favorable conditions
Basic Characteristics
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Basic Characteristics continuedSome survive freezing
Some form spores
Some spoil food; others cause illness
Some produce toxins that cause illness
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Food Microorganisms require nutrients found in potentially hazardous food to grow
Proteins
Carbohydrates
Acidity
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Pathogenic bacteria grow well in food that is slightly acidic or neutral (pH of 4.6 to 7.5)
Temperature
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Most microorganisms grow well at temperatures between 41˚F and 135˚F (5˚C and 57˚C)
Time
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Foodborne microorganisms need sufficient time to grow
4 hours or more in TDZ = growth high enough to cause illness
Oxygen
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Some pathogens require oxygen to grow, while others grow when oxygen is absent
Moisture
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Most microorganisms grow well in moist food
Moisture is calculated using a measurement called water activity (aw)
Potentially hazardous food typically has an aw
of .85 or higher
Which conditions typically support the growth of microorganisms?___1. Food high in fat content
___2. Protein food source
___3. pH of 9.0
___4. Temperature of 155F (68C) or higher
___5. Dry environment
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Caused by BacteriaSalmonellosis
Shigellosis
Listeriosis
Staphylococcal Gastroenteritis
Clostridium perfringens Gastroenteritis
Bacillus cereus Gastroenteritis
Botulism
Campylobacteriosis
Hemorrhagic colitis
Vibrio Gastroenteritis/Septicemia
Yersiniosis
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Illness: Salmonellosis Bacteria: Salmonella spp.
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Illness: Salmonellosis continued Bacteria: Salmonella spp.
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Illness: Listeriosis Bacteria: Listeria monocytogenes
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Illness: Listeriosis continued Bacteria: Listeria monocytogenes
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Illness: Staphylococcal Gastroenteritis Bacteria: Staphylococcus aureus
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Illness: Staphylococcal Gastroenteritis continued
Bacteria: Staphylococcus aureus
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Illness: Clostridium perfringens Gastroenteritis
Bacteria: Clostridium perfringens
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Illness: Clostridium perfringens Gastroenteritis continued
Bacteria: Clostridium perfringens
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Illness: Botulism Bacteria: Clostridium botulinum
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Illness: Botulism continued Bacteria: Clostridium botulinum
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Illness: Hemorrhagic colitisBacteria: Shiga toxin-producing Escherichia coli,
including O157:H7 and O157:NM
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Illness: Hemorrhagic colitis continued Bacteria: Shiga toxin-producing Escherichia coli,
including O157:H7 and O157:NM
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Basic CharacteristicsUnlike bacteria, they rely on a living cell to reproduce
Unlike bacteria, they do not reproduce in food
Some may survive freezing and cooking
Can be transmitted from person to person, from people to food, and from people to food-contact surfaces
Can contaminate both food and water supplies
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Caused by Viruses Hepatitis A
Norovirus Gastroenteritis
Rotavirus Gastroenteritis
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Illness: Hepatitis A Virus: Hepatovirus or hepatitis A virus
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Illness: Hepatitis A continuedVirus: Hepatovirus or hepatitis A virus
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Illness: Norovirus Gastroenteritis Virus: Norovirus
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Illness: Norovirus Gastroenteritis continuedVirus: Norovirus
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Illness: Rotavirus Gastroenteritis Virus: Rotavirus
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Illness: Rotavirus Gastroenteritis continued
Virus: Rotavirus
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Basic CharacteristicsLiving organisms that need a host to survive
Small, often microscopic
Grow naturally in many animals andcan be transmitted to humans
Pose a hazard to food and water
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Caused by Parasites Trichinosis
Anisakiasis
Giardiasis
Toxoplasmosis
Intestinal Cryptosporidiosis
Cyclosporiasis
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Illness: TrichinosisParasite: Trichinella spiralis
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Illness: Trichinosis continuedParasite: Trichinella spiralis
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Illness: Giardiasis Parasite: Giardia duodenalis
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Illness: Giardiasis continued Parasite: Giardia duodenalis
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Illness: Intestinal Cryptosporidiosis Parasite: Cryptosporidium parvum
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Illness: Intestinal Cryptosporidiosis continued Parasite: Cryptosporidium parvum
Identify the Pathogen 1. _____________________________________________
I can be found in water contaminated by feces.
I am sometimes found in shellfish.
I can produce fatigue and jaundice.
Obtaining shellfish from an approved source can be a safeguard against me.
2. _____________________________________________
I can be carried in the intestinal tract of humans.
I am sometimes found in shell eggs.
I can produce fever and diarrhea.
My growth can be slowed by refrigeration.
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Fungi
FungiCommonly cause food spoilage and sometimes illness
Molds Yeasts
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Basic CharacteristicsSpoil food and sometimes cause illness
Grow well in acidic food with a low water activity
Freezing prevents or reduces their growth, but does not destroy them
Some produce toxins such as aflatoxins
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Basic Characteristics
Grow well in acidic food with low water activity
May produce a smell or taste of alcohol as they spoil food
May appear as a pink discoloration or slime and may bubble
Some spoil food rapidly
Foodborne InfectionsResult when a person eats food containing pathogens, which then grow in the intestines and cause illness
Foodborne IntoxicationsResult when a person eats food containing toxins that cause illness
Foodborne Toxin-Mediated InfectionsResult when a person eats food containing pathogens, which then produce illness-causing toxins in the intestines
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