FOOD POISONING (c) PDST Home Economics. FOOD POISONING Food poisoning is caused by eating food containing harmful substances. There are 3 types of food.

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Presentation transcript:

FOOD POISONING (c) PDST Home Economics

FOOD POISONING Food poisoning is caused by eating food containing harmful substances. There are 3 types of food poisoning Chemical food poisoning: caused by chemicals such as antibiotics or pesticides in the food. Biological food poisoning: caused by chemicals that occur naturally in the food e.g. solanine in green potatoes or toxins in red kidney beans. Bacterial food poisoning: caused by the presence of pathogenic bacteria in the food.

SYMPTOMS OF FOOD POISONING Nausea Vomiting Abdominal cramps Diarrhoea Fever Headache Loss of appetite Very serious for infants, invalids, pregnant women and elderly.

(H) BACTERIAL FOOD POISONING There are 2 types of bacterial food poisoning: 1. Toxic food poisoning 2. Infectious food poisoning

(H) 1. TOXIC FOOD POISONING Some bacteria produce exotoxins as they grow in food both before and after its eaten. Exotoxins are hard to destroy. Boiling for 30 mins is required. Symptoms develop quickly- often within 2 hours Examples: staphylococci and clostridium botulinum

(H) 2. INFECTIOUS FOOD POISONING Caused by eating food containing large numbers of live pathogenic bacteria. These bacteria make endotoxins which are released when they die. Endotoxins are easy to destroy. Proper cooking and reheating will destroy both toxins and bacteria. If not destroyed symptoms will appear after approx. 12 hours Salmonella and listeria cause infectious food poisoning.

(H) HIGH RISK FOODS Liquid protein foods are at high risk of contamination Milk, cream Eggs & egg dishes e.g. custard, mayonnaise Meat, poultry, fish, shellfish Meat pies, gravies, sauces, soups and stock Reheated dishes

(H) FOOD POISONING BACTERIA Learn 3 common strains of food poisoning bacteria: e.g. Salmonella, Staphylococcus aureus, Listeria monocytogenes. Habitat /Sources Factors affecting growth High risk foods Incubation period Toxic or infectious Symptoms

OTHER FOOD & WATER BORNE DISEASES Here the food acts only as a means of transport for the organism. They do not grow in it. Incubation longer. Only small number of organisms can cause illness. Organism enters bloodstream. Symptoms varied - may not include vomiting or diarrhoea.