1. Types of bacteria
Spoilage: Not particularly harmful bacteria which cause food to go off
Beneficial: “Good Bacteria” which are used to make yoghurt and cheese
Pathogenic: Illness causing bacteria

2. In order to grow and multiply germs need:
Warmth
Time
Moisture
Food
Remember it like this
Too
Many
Flies
Waiting

3. In ideal conditions where there is Moisture, Food and Warmth (37degrees centigrade is ideal), bacteria can double every 10 to 20 minutes. They do this by dividing in to two. This is called
Binary Fission

4. These cells are beginning to divide into two

5. Bacterial growth After 10 minutes After 20 minutes After 30 minutes

6. From 0 to 1,536,000 in only 80 minutes !!!!!! Time : 9.30 Bacteria : 0
cooking chicken to a core temperature of 75°C should kill most of the bacteria
Time : 9.30
Bacteria : 0
Time : 9.40
Bacteria : 12,000
Time : 9.50
Bacteria : 24,000
Knife contaminated by blood
Time :
Bacteria : 48,000
Time :
Bacteria : 96,000
Time :
Bacteria : 192,000
Time :
Bacteria : 384,000
Time :
Bacteria : 768,000
Time :
Bacteria : 1.5 million
From 0 to 1,536,000 in only 80 minutes !!!!!!

7. Spore Formation
This is what happens …………..
Cell

8. Spore forms in cell

9. Cell disintegrates

10. Spore is released

11. Spore starts to germinate

12. Spore continues to germinate

13. Now see as, in suitable conditions, the cell begins to divide (binary fission)………………………….

15. Toxins
Some bacteria release poisons known as toxins which cause food poisoning. Some toxins, known as exotoxins multiply in food. These toxins are not easily destroyed by cooking and may remain in food once they have developed. Other bacteria produce toxins inside the human body only after the food has been eaten. These are called endotoxins

16. Food Poisoning bacteria
Usually need millions of bacteria to cause illness.
The multiplication of bacteria within the food plays an important part in the disease

17. Staphylococcus Aureus
Found in human nose and throat (also skin)
Clostridium Perfingens
Found in animals and birds
Salmonella
Found in animals, raw poultry and birds
Clostridium Botulinum
Found in the soil and associated with vegetables and meats
Bacillus Cereus Found in soil, vegetation, cereals and spices

18. Salmonella
Sources - The intestines of ill people and carriers, animals and animal food, raw meat, raw poultry, raw milk, raw eggs, food pests
Common food vehicles – Undercooked or contaminated cooked meat, raw milk and eggs
Onset period – 6 to 72 hours (usually 12 to 36) Endotoxin in intestine (infective food poisoning)

19. Salmonella
Symptoms - Abdominal pain, diarrhoea, vomiting and fever. Duration is usually one to seven days.
Specific characteristics – Usually requires millions of bacteria to cause illness. Multiplies from 5°C to 47°C under aerobic or anaerobic conditions.

20. Clostridium perfingens
Sources - The intestines of humans and animals, faeces and sewage, soil food pests, raw meat and poultry
Common food vehicles – Rolled joints, casseroles, stews, sauces and meat pies when cooking has removed oxygen
Onset period – 8 to 22 hours (usually 12 to 18) Enterotoxin in intestine. (infective food poisoning)

21. Clostridium perfingens
Symptoms - Abdominal pain, diarrhoea, (vomiting is rare) and fever. Duration is usually 12 to 48 hours.
Specific characteristics – Usually requires millions of bacteria to cause illness. At 46°C it can double every 10 minutes. Produces spores. Illness caused from consuming millions of organisms

22. Staphylococcus Aureus
Sources - Human nose, mouth, skin, hands, spots, boils, septic cuts etc
Common food vehicles – Dairy products. Cold cooked meat and poultry, peeled cooked prawns
Onset period – 1 to 7 hours (usually 12 to 18) Exotoxin produced in food. (Toxic food poisoning)

23. Staphylococcus Aureus
Symptoms - Abdominal pain, diarrhoea, vomiting. Occasionally subnormal temperatures. Duration between 6 and 24 hours.
Specific characteristics – Usually requires millions of bacteria to cause illness. Toxin may survive boiling for up to 30 minutes.

24. Bacillus Cereus
Sources - Cereals, especially rice, cornflour, spices, dust and soil
Common food vehicles – Reheated rice, cornflour and spices.
Onset period – 1 to 5 hours. Exotoxin produced in food. (Toxic food poisoning)

25. Bacillus Cereus
Symptoms - Abdominal pain, diarrhoea, vomiting. Occasionally subnormal temperatures. Duration between 12 and 24 hours.
Specific characteristics – Forms spores which survive under normal cooking conditions. Millions required to cause illness. Bacteria multiply between 7°C and 48°C.

26. Clostridium Botulinum
Sources - Fish intestine, soil and vegetables.
Common food vehicles –Smoked fish, bottled vegetables.
Onset period –2 hours to 5 days (usually 12 to 36 hours). A heat sensitive neurotoxin produced in the food which affects the nervous system. (Toxic food poisoning)

27. Clostridium Botulinum
Symptoms - Difficulties in swallowing, talking and breathing. Double vision and paralysis. Diarrhoea followed by constipation. Fatalities are common and survivors may take several months to recover.
Specific characteristics – Forms spores which will survive normal cooking temperatures. Millions required to cause illness. Bacteria multiply between 3.3°C and 48°C.