Concetti Chiave
- Bacteria are microscopic organisms, with types that are useful, cause spoilage, or are pathogenic and lead to food poisoning.
- Pathogenic bacteria are found in raw food, pests, people, and the environment, causing foodborne illnesses.
- Cooking destroys most bacteria, but some can survive in harsh conditions by forming protective spores.
- Bacteria need food, moisture, warmth, and time to multiply to dangerous levels, and they move via contamination vehicles like people and utensils.
- Food contamination can be physical, chemical, or microbial, and occurs directly, indirectly, or through cross-contamination.
Bacteria and food poisoning
Bacteria are single celled micro-organism, invisible to human eye and living all around the natural world. There are helpful bacteria, spoilage bacteria and photogenic bacteria.
Useful and pathogenic bacteria
Helpful bacteria help us to digest food, to make food such as yogurt and cheese and make crops.
Spoilage bacteria make food perish.
Pathogenic bacteria cause illness and responsible for food poisoning and food borne diseases. They can be found in raw food, pests and pets, people, air and dust, dirt and food waste.
Cooking usually destroys them, but when they form spores, that is a protective coating, bacteria can survive even harsh conditions.
Bacteria can move, but they cannot travel on their own. They need vehicles of contamination for example: people, animals, equipment and utensils.
To multiply to dangerous levels bacteria need particular conditions such as food, moisture, warmth and time.
Food contamination
Food contamination refers to the presence in food of harmful chemicals and microorganisms which can cause consumer illness.
Contaminants can be: Examples of physical contaminants are: stones, fruit leaves, shell fragments, fish scales, poultry bone fragments, jewellery, hair, fingernails, insects, dust, dirt.
Examples of chemical contaminants are: clearing chemicals, agricultural chemicals, pesticides and pest bait.
Example of microbial contaminants are: cuts, boils of the skin, poor personal hygiene on hands, ears, hair, insects, mice, dogs, cats, fur feathers, untreated sources of drinking water, unwashed fruit and vegetables.
Contamination can be:
DIRECT, when a raw food touches a high risk food;
INDIRECT, when a liquid or juice from a raw food drip onto high risk food;
CROSS, when bacteria are carried, for instance by hands or utensils, from a raw food to a high risk food.
Domande da interrogazione
- What roles do different types of bacteria play in food and health?
- How can pathogenic bacteria survive cooking processes?
- What are the different types of food contamination and how do they occur?
Bacteria can be helpful, spoilage, or pathogenic. Helpful bacteria aid in digestion and food production, spoilage bacteria cause food to perish, and pathogenic bacteria lead to food poisoning and diseases.
While cooking usually destroys bacteria, pathogenic bacteria can form spores, a protective coating that allows them to survive harsh conditions, including cooking.
Food contamination can be physical, chemical, or microbial. It occurs directly when raw food touches high-risk food, indirectly when juices from raw food drip onto high-risk food, or through cross-contamination via hands or utensils.
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