common symptoms of food borne illness

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FFH 0 Foundation Certificate in Food Hygiene

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Page 1: Common symptoms of food borne illness

FFH 0

Foundation Certificate

in Food Hygiene

Page 2: Common symptoms of food borne illness

FFH 1

Why food hygiene?

• Food-borne illness can be serious and

distressing

• Training is a legal requirement

• Food-borne illness figures are increasing

• Customers will take their business away

• Legal action could be taken by enforcement

officers

• Compensation claims from sufferers

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Food hygiene

All those practices and procedures that

can help to produce safe food

Page 5: Common symptoms of food borne illness

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Common symptoms of

food-borne illness

• Vomiting

• Diarrhoea

• Nausea

• Abdominal and stomach pains

• Fever/high temperature

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Page 7: Common symptoms of food borne illness

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Causes of food-borne illness

• Micro-organisms– bacteria (pathogenic)– moulds (only certain types)– viruses

• Chemicals– cleaning products, pesticides

• Metals– tin, lead, copper

• Natural poisons– red kidney beans, toadstools, berries

• Physical contamination– glass, screws, plastic

Page 8: Common symptoms of food borne illness

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Types of bacteria

• Pathogenic

– cause illness in humans

– difficult to detect

• Spoilage

– make food perish/rot/spoil

– signs easy to detect

• Useful

– in food production, drug manufacture, food digestion

Page 9: Common symptoms of food borne illness

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Page 10: Common symptoms of food borne illness

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Sources of pathogenic

bacteria

• Raw foods

– raw meats, poultry, fish and shellfish

• Soil, dirt and dust

– unwashed vegetables and salads

• Pests and domestic pets

• Humans

– hands, hair, nose and throat, infected cuts

• Food waste

• Airborne dust

• Untreated water and sewage

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Bacteria cause illness in

different ways

• Large numbers (millions)

– invade and irritate the stomach and intestine

and produce waste products or toxins

(poisons)

– may produce toxins in the food itself – often

difficult to destroy once in the food

• Small numbers (as few as 10)

– may invade and multiply in the bloodstream

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How bacteria multiply

• Divide into 2 (binary fission)

• As quickly as 10-20 minutes

• After several hours can be millions

• To multiply they need

– food (mainly protein)

– moisture

– warmth

– sufficient time

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Common pathogenic bacteria

• Salmonella

• Clostridium

• Staphylococcus

• E. coli

• Campylobacter

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Others

• Listeria

• Typhoid (caused by a type of Salmonella)

• Shigella (causes dysentery)

Page 15: Common symptoms of food borne illness

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Salmonella

• Sources

– poultry, other raw meats, eggs, pests

• Key control

– thorough cooking

• Danger points

– knives and boards (colour coding)

– hands

– food containers and work surfaces

Page 16: Common symptoms of food borne illness

FFH 15

Clostridium perfringens

• Sources– soil, dust, raw meats, salads and vegetables

(soil)

• Key control (spore former)– good temperature control after cooking or heat

processing

• Danger points– 'dirty' salads and vegetables – wash carefully

– cross-contamination from raw foods

Page 17: Common symptoms of food borne illness

FFH 16

Staphylococcus aureus

• Sources– humans – skin, hair, hands, nose, throat, cuts

– raw (untreated) milk

• Key controls– good personal hygiene

– hand washing

– waterproof dressings on cuts

– hygienic habits

• Danger points– long times in danger zone

– direct handling of high risk food

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E. coli

• Sources– raw meats and poultry

– animal and human sewage

• Key controls– thorough heat processing and cooking

– separation of raw and high risk foods

– disinfection of salads and vegetables

• Danger points– undercooked meat products

– handling raw and high risk foods together

– misuse of colour-coded boards

Page 19: Common symptoms of food borne illness

FFH 18

Campylobacter

• Sources– raw meats and poultry

– pets

– untreated water and sewage

• Key controls– thorough cooking

– separation of raw meats

• Danger points– undercooked meat products

– handling raw and high risk foods together

– misuse of colour-coded boards

Page 20: Common symptoms of food borne illness

FFH 19

High risk foods

• Cooked meat and poultry products

• Milk, cream, ice cream

• Sauces, gravies

• Cooked dairy products

• Fish and shellfish – cooked or in some

cases raw

• Any food containing the above

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Managing high risk foods

• Control temperature

• Ensure heat processing is thorough

• Avoid handling

• Keep covered or wrapped

• Keep separate from raw foods

Page 22: Common symptoms of food borne illness

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Microbiology and illness

Summary

• Symptoms and onset times

• Types of food-borne illness (bacterial and

non-bacterial)

• Bacteriology – multiplication, pathogenic and

spoilage bacteria

• Sources of bacteria

• Toxins and spores

• High risk foods

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Chemical contamination

• Cleaning chemicals

• Pesticides

• Maintenance – oils, grease, paints

• Metals – storage in opened cans,

dissolved from cooking containers

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Preventing chemical

contamination

• Careful labelling, use and storage of

cleaning products

• Professional pest control

• Control of maintenance staff

• Control use of metallic containers for

storage and cooking

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Physical contamination

• Pests – fur, droppings, bodies

• Product – bone, stones, shell

• Premises – brick, glass, airborne dust

• People – hair, pens, buttons, cigarettes,

jewellery

• Packaging – string, metal staples, plastic

• Process – equipment, maintenance

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Preventing physical

contamination

• Sieving

• Metal detection

• Clothing standard

• Pest control

• Maintenance of equipment and building

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100oC63oC37oC5oC-18oC

d a n g e r z o n e

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Dealing with the danger zone

• Serve or dispatch as soon as possible

• Cool down rapidly, heat up thoroughly – limit

bulk

• Keep high risk foods below 5oC or above

63oC

• Keep time in danger zone to a minimum – no

more than 90 minutes

• Avoid re-heating

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Signs of spoilage

Changes in:

• Smell

• Taste

• Colour

• Texture

– slime

– dryness

– staleness

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Preservation methods

• Dehydration

• Canning

• Vacuum packing

• Freezing and chilling

• Salting or brining

• High sugar concentrations

• Pickling and alcohol preserving

• Smoking

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The safety of preserved foods

• Check condition of packaging

• Follow storage instructions

• Follow date coding– use by

– best before

• When opened – check storage instructions again

– if not used immediately, put into suitable storage container or refrigerate

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Product dates

• Use by 3rd

• Use by 10th

• Use by 13th

• Use by 22nd

• Use by 28th

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Storing food in refrigerators

• If possible, store raw foods separately

• Store raw meat and poultry below other

foods

• Allow for air circulation

• Keep door closed

• Do not put hot food in refrigerator

Page 38: Common symptoms of food borne illness

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Contamination and prevention

of illness - Summary

• Food can be contaminated by chemicals, physical

objects and micro-organisms

• Bacteria can spread easily

• Three main controls: cover, separate and avoid

handling

• Thawing and heat processing must be thorough

• Food must not be left in the danger zone

• Food must be examined regularly for signs of

spoilage

Page 39: Common symptoms of food borne illness

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Why is personal hygiene

important?

• Food handlers touch and handle most

foods many times a day

• People are sources of contamination

• Infected food handlers are dangerous

• Customers like to see hygienic staff

Page 40: Common symptoms of food borne illness

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Human sources of

contamination

• Hair

• Ear, nose, throat

• Skin and hands

• Gut

• Clothing

• Wounds

• Jewellery

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Clothing standards

• Protective clothing

– clean, washable, coverage

• Headwear

– hats, hairnets

• Jewellery

• Footwear

– safety and hygiene

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Hygienic food handling

• Avoid direct contact with food

• Avoid cross-contamination

• Wash hands regularly

• No smoking

• Change protective clothing when contaminated

• Do not cough, sneeze or use tissues near food

• Taste food hygienically

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Hand washing

• Regular and thorough

• Use proper facilities

• Before work and after breaks

• Between tasks

• After emptying waste or cleaning

• After visiting toilet

Page 45: Common symptoms of food borne illness

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Conditions to be reported

• Nausea, vomiting, diarrhoea, stomach

pains

• Rash, skin conditions, skin wounds

• Contact with sufferers in family

• Any unusual symptoms following visits

abroad

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Control of infected food

handlers

• Medical advice and tests may be required

• Keep away from food handling

• Return to work allowed when risk is low

• Personal hygiene standards especially

important on return to work

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Treating cuts, scratches

or spots

• Medical attention may be necessary

• Clean the wound

• Use waterproof dressing

• Prevent dressing from getting into food

– cover with disposable glove

– may need to be detectable:• brightly coloured

• metallic strip

Page 48: Common symptoms of food borne illness

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Personal hygiene

Summary

• Food handlers should wear appropriate overclothing whenever they work with food

• Hygienic food handling is essential

• Hand hygiene is the most effective personal hygiene control

• All illnesses with the risk of infection must be reported

• Wounds must be treated promptly and covered fully

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Why clean?

Mainly to remove harmful contamination:

• Bacteria

• Physical contamination

• Waste food

– food supply for pests

– harbourage for bacteria

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Other reasons to clean

• Presents a good appearance

• Helps to reveal signs of pest infestation

• Helps to maintain equipment in good

working order

• Legal standards

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Cleaning

• Removes dirt, grease, food, soil

• Does not destroy bacteria

• Requires:

– heat/hot water

– physical effort – brush, cloth, scourer

– detergent

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Disinfection

• Destruction of bacteria to a safe level

• Two main methods

– heat – steam or water at 82oC or hotter

– chemical disinfectants

• Cannot easily disinfect dirty surfaces

• Essential for all food-contact and

hand-contact surfaces

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Cleaning + disinfection

1. Pre-clean – wash or wipe

2. Main clean – hot detergent wash

3. Rinse

4. Disinfect – allow contact time

5. Final rinse

6. Dry

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Using a sanitiser

1. Pre-clean – wash or wipe

2. Apply sanitiser – allow contact time

3. Rinse

4. Dry

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Cleaning and disinfection

Summary

• Cleaning removes visible dirt and soil

• Disinfection destroys bacteria

• Sanitising = cleaning + disinfection

• Food-contact and hand-contact surfaces are

a priority for disinfection

• Different chemicals have different uses

• Instructions and schedules must be followed

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Consequences of a pest

infestation

• Customer complaints

• Loss of reputation and business

• Food stocks damaged and contaminated

• Spread of disease

• Damage to buildings and equipment

• Complaints/investigation from enforcing officers

• Legal action

• Loss of staff morale

Page 59: Common symptoms of food borne illness

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Food pests

Creatures living in or feeding on food

• Rodents – rats and mice

• Birds – pigeons, starlings, sparrows, seagulls

• Insects– flies, cockroaches, moths, ants, wasps

• Stored product pests– beetles, mites, weevils

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Signs of pests

• Live and dead pests

• Fur, feathers

• Droppings, eggs and egg cases

• Damaged food and spillages, gnawed

cabling/pipes

• Smear marks and prints

• Noise, smell

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Pest control

• Prevent access – proofing

• Reduce attraction

– food

– moisture

– warmth

– shelter and nesting

• Treatment and monitoring of infestations

– professional expertise

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Preventing access for pests

• Fly screens

• Block gaps around service access

• Gutter guards

• Door strips and plates

• Check food deliveries

• Keep doors and windows closed

• Maintain drainage systems

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Reducing the attraction

• Food – pest-proof containers, examine foods, clean up spillages

• Moisture – clean up wet spillages, avoid storing liquids uncovered, report leaks and drips

• Warmth – keep temperatures down, check warm areas more often

• Shelter and nesting – control waste, avoid clutter, clean regularly

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Pest control treatments

• Maintain cleanliness in the area unless instructed otherwise

• Continue to report signs of infestation

• Do not touch bait or treatment equipment

• If touched, wash hands immediately

• Do not disturb or remove any treatment device

Page 66: Common symptoms of food borne illness

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Food pests

Summary

• Food handlers should look for and

report signs of pests

• Prevention is better than treatment

• Basic good cleanliness and tidiness is

vital

• Treatment should always be

professionally controlled

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Premises and equipment

• Surfaces – condition, ease of cleaning

• Equipment – easy to clean

• Layout and workflow – efficient, spacious, convenient, separate areas

• Services and facilities – wash hand basins, sinks, refuse storage, drainage, lighting, ventilation

• Pest proofing

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Work surfaces

• Smooth

• Non-absorbent (impervious)

• Easy to clean

• Hardwearing

• In good condition

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Equipment

• Can be taken apart

• Easy to clean

• Non-toxic

• Impervious

• No cracks, gaps or difficult corners

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Layout and workflow

• Space for different activities

• Efficient

• Safe

• Access to equipment

• Clear flow from raw to cooked

• Separate areas – raw foods, refuse, washing, changing rooms etc.

• Colour coding of equipment, clothing and areas

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Services and facilities

• Wash hand basins – suitable for use, water, drying facilities etc.

• Sinks – equipment, food

• Refuse storage – indoor and outdoor

• Drainage channels, gullies

• Lighting – to help effective cleaning

• Ventilation – reduce temperature, condensation, dust etc.

• Control of air temperature – heating, air conditioning

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Premises and equipment

Summary

• Structure and layout can aid cleaning

• Good layout can minimise cross-

contamination

• Faults must be reported as soon as

possible

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Food safety law

Food (includes drinks and water) must be:

• safe

• free from contamination

• of reasonable quality

• fit for human consumption

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Legal requirements

• General structure – clean, good repair,

size and layout

• Toilets, wash hand basins

• Lighting, ventilation, drainage

• Floors, walls, ceilings, work surfaces

• Sinks – food and cleaning

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Mobile and temporary premises,

vehicles, stalls, vending machines and

domestic premises:

• Similar standards where practicable

or other suitable measures

Legal requirements

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Equipment

• Clean

• Good condition

• Designed to minimise contamination

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Food waste

• Must not accumulate

• Closed containers – good construction,

easy to clean and disinfect

• Removal and storage

• Prevent pest access

Page 81: Common symptoms of food borne illness

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Water

• Ice, washing of food etc. – use safe

water

• Any steam used in or near food must be

produced from safe water

Page 82: Common symptoms of food borne illness

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Personal hygiene

• High standard of personal hygiene –

habits!

• Overclothing as appropriate

• Infected food handlers must report to

supervisor – must be excluded if risk is

significant

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Protection of food

• Raw ingredients – don't accept if

contaminated

• Food protected from contamination

• Pest prevention and control

• Spoiled, unfit or waste food must be

labelled or otherwise identifiable

Page 84: Common symptoms of food borne illness

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Temperature control

• Applies to high risk foods

• Cold foods – below 8oC

• Hot foods – above 63oC

• Allowances made during service,

cooling or re-heating

– e.g. cold foods 4 hours, hot foods 2 hours

Page 85: Common symptoms of food borne illness

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Training of food handlers

• Supervision

• Instruction

• Training

• Appropriate to the job

• Should be kept up to date

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Enforcement powers and

actions

• Give advice

• Send a letter

• Serve a notice

• Prosecute

• Close down business

• Seize food

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Who can be prosecuted?

• Owners

• Managers

• Supervisors

• Food handlers

Penalties

• Fines

• Imprisonment

• Barred from working with food

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HACCP

• Management responsibility

• Needs to be documented

• Different systems and methods to suit

the business

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Hazard anything in the food which could

harm the consumer

Analysis an organised step by step

approach

Critical concentrating on the most

important dangers

Control specific standards and checks

to protect food safety

Point(s) specific part(s) of the food

production process

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Food safety control

Summary

• Controls are the responsibility of everyone in

the food business

• The law places legal duties on food handlers

as well as proprietors

• HACCP is a method which helps to ensure all

hazards are controlled as far as possible

• Food safety depends on knowledgeable food

handlers