How Contamination Happens

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2 How Contamination HappensContaminants come from a variety of places:Animals we use for foodAir, contaminated water, and dirtPeopleDeliberatelyAccidentallyInstructor Notes:Contamination comes from a variety of places.Contaminants can cause foodborne illness or result in physical injury.Contaminants are found in the animals we use for food, the air, water, dirt; and they occur naturally in food, such as bones in fish.Food can be contaminated on purpose.Most food is contaminated accidently.Examples of accidental contamination include: food handlers who don’t wash their hands after using the restroom, and then contaminate food and surfaces with feces from their fingers; and food handlers who pass contaminants through illness.2-2

3 How Contamination HappensPeople can contaminate food when:They do not wash their hands after using the restroomThey are in contact with a person who is sickThey sneeze or vomit onto food or food- contact surfacesThey touch dirty food-contact surfaces and equipment and then touch foodInstructor Notes:Food handlers who don’t wash their hands after using the restroom may contaminate food and surfaces with feces from their fingers. Once the food that the food handler touched is eaten, a foodborne illness may result. This is called the fecal-oral route of contamination.2-3

4 Biological ContaminationCommon symptoms of foodborne illness:DiarrheaVomitingFeverNauseaAbdominal crampsJaundice (yellowing of skin and eyes)Onset times:Depend on the type of foodborne illnessCan range from 30 minutes to six weeksInstructor Notes:The symptoms of a foodborne illness vary depending on which illness a person has. But most victims of foodborne illness share some common symptoms.Not every person who is sick from a foodborne illness will have all of these symptoms. Nor are the symptoms of a foodborne illness limited to this list.How quickly foodborne-illness symptoms appear in a person is known as the onset time of the illness. Onset times depend on the type of foodborne illness a person has. They can range from 30 minutes to as long as six weeks. How severe the illness is can also vary, from mild diarrhea to death.2-4

5 Major Bacteria That Cause Foodborne IllnessThe FDA has identified three types of bacteria that cause severe illness and are highly contagious:Salmonella TyphiShigella spp.Enterohemorrhagic and shiga toxin-producing Escherichia coliInstructor Notes:Food handlers with illnesses from these bacteria can NEVER work in a foodservice operation while they are sick.These three bacteria are included in the FDA’s “Big Five” pathogens.2-5

6 Major Bacteria That Cause Foodborne IllnessBacteria: Salmonella Typhi (SAL-me-NEL-uh TI-fee)Source: PeopleFood Linked with the BacteriaPrevention MeasuresReady-to-eat foodBeveragesExclude food handlers diagnosed with an illness caused by Salmonella Typhi from the operationWash handsCook food to minimum internal temperaturesInstructor Notes:Salmonella Typhi lives only in humans.People with typhoid fever carry the bacteria in their bloodstream and intestinal tract.Eating only a small amount of these bacteria can make a person sick.The severity of symptoms depends on the health of the person and the amount of bacteria eaten. The bacteria are often in a person’s feces for weeks after symptoms have ended.2-6

7 Major Bacteria That Cause Foodborne IllnessBacteria: Shigella spp. (shi-GEL-uh)Source: Human fecesFood Linked with the BacteriaPrevention MeasuresFood easily contaminated by hands, such as salads containing TCS food (potato, tuna, shrimp, macaroni, chicken)Exclude food handlers diagnosed with an illness caused by Shigella spp. from the operationExclude food handlers who have diarrhea from the operationFood that has made contact with contaminated water, such as produceWash handsControl flies inside and outside the operationInstructor Notes:Shigella spp. is found in the feces of humans with the illness.Most illnesses occur when people eat or drink contaminated food or water.Flies can also transfer the bacteria from feces to food.Eating only a small amount of these bacteria can make a person sick.High levels of the bacteria are often in a person’s feces for weeks after symptoms have ended.2-7

8 Major Bacteria That Cause Foodborne IllnessBacteria: Enterohemorrhagic and shiga toxin-producingEscherichia coli (ess-chur-EE-kee-UH-KO-LI)Source: Intestines of cattle; infected peopleFood Linked with the BacteriaPrevention MeasuresGround beef (raw and undercooked)Contaminated produceExclude food handlers who have diarrhea or have been diagnosed with a disease from the bacteriaCook food, especially ground beef, to minimum internal temperaturesPurchase produce from approved, reputable suppliersPrevent cross-contamination between raw meat and ready-to-eat foodInstructor Notes:Enterohemorrhagic and shiga toxin-producing E. coli can be found in the intestines of cattle.It is also found in infected people.The bacteria can contaminate meat during slaughtering.Eating only a small amount of the bacteria can make a person sick.Once eaten, it produces toxins in the intestines, which cause the illness.The bacteria are often in a person’s feces for weeks after symptoms have ended.2-8

9 Major Viruses that Cause Foodborne IllnessesThe FDA has identified two viruses that are highly contagious and can cause severe illness:Hepatitis ANorovirusFood handlers diagnosed with an illness from hepatitis A or Norovirus must not work in an operation while they are sick.Instructor Notes:These two viruses are included in the FDA’s “Big Five” pathogens.2-9

10 Major Viruses That Cause Foodborne IllnessVirus: Hepatitis A (HEP-a-TI-tiss)Source: Human fecesFood Linked with the VirusPrevention MeasuresReady-to-eat foodShellfish from contaminated waterExclude staff who have been diagnosed with hepatitis A from the operationExclude staff who have jaundice from the operationWash handsAvoid bare-hand contact with ready-to-eat foodPurchase shellfish from approved, reputable suppliersInstructor Notes:Hepatitis A is mainly found in the feces of people infected with it.The virus can contaminate water and many types of food.It is commonly linked with ready-to-eat food. However, it has also been linked with shellfish from contaminated water.The virus is often transferred to food when infected food handlers touch food or equipment with fingers that have feces on them.Eating only a small amount of the virus can make a person sick.An infected person may not show symptoms for weeks but can be very infectious.Cooking does not destroy hepatitis A.2-10

11 Major Viruses That Cause Foodborne IllnessVirus: Norovirus (NOR-o-VI-rus)Source: Human fecesFood Linked with the VirusPrevention MeasuresReady-to-eat foodShellfish from contaminated waterExclude staff who have been diagnosed with Norovirus from the operationExclude staff who have diarrhea and vomiting from the operationWash handsAvoid bare-hand contact with ready-to-eat foodPurchase shellfish from approved, reputable suppliersInstructor Notes:Like hepatitis A, Norovirus is commonly linked with ready-to-eat food.It has also been linked with contaminated water.Norovirus is often transferred to food when infected food handlers touch food or equipment with fingers that have feces on them.Eating only a small amount of Norovirus can make a person sick. It is also very contagious.People become contagious within a few hours after eating it.The virus is often in a person’s feces for days after symptoms have ended.2-11

12 Biological Toxins Origin: Seafood toxins:Naturally occur in certain plants, mushrooms, and seafoodSeafood toxins:Produced by pathogens found on certain fishTuna, bonito, mahimahiHistamine produced when fish is time- temperature abusedOccur in certain fish that eat smaller fish that have consumed the toxinBarracuda, snapper, grouper, amberjackCiguatera toxin is an exampleInstructor Notes:Some toxins are naturally associated with certain plants, mushrooms, and seafood. Toxins are a natural part of some fish.Other toxins, such as histamine, are made by pathogens on the fish when it is time-temperature abused. This can occur in tuna, bonito, mackerel, and mahimahi.Some fish become contaminated when they eat smaller fish that have eaten a toxin. One of these toxins is the ciguatera toxin. It can be found in barracuda, snapper, grouper, and amberjack. Shellfish, such as oysters, can be contaminated when they eat marine algae that have a toxin.2-12

13 Biological Toxins Illness: General symptoms:Symptoms and onset times vary with illnessPeople will experience illness within minutesGeneral symptoms:Diarrhea or vomitingNeurological symptomsTingling in extremitiesReversal of hot and cold sensationsFlushing of the face and/or hivesDifficulty breathingHeart palpitationsInstructor Notes:Toxins cannot be destroyed by cooking or freezing. The most important way to prevent a foodborne illness is to purchase plants, mushrooms, and seafood from approved, reputable suppliers. It is also important to control time and temperature when handling raw fish.2-13

14 Deliberate Contamination of FoodGroups who may attempt to contaminate food:Terrorists or activistsDisgruntled current or former staffVendorsCompetitorsFDA defense tool:A.L.E.R.T.Instructor Notes:So far, you have learned about methods to prevent the accidental contamination of food. But you also must take steps to stop people who are actually trying to contaminate it. This may include the groups listed on the slide.These people may try to tamper with your food using biological, chemical, or physical contaminants. They may even use radioactive materials. Attacks might occur anywhere in the food supply chain. But they are usually focused on a specific food item, process, or business.The best way to protect food is to make it as difficult as possible for someone to tamper with it. For this reason, a food defense program should deal with the points in your operation where food is at risk.The FDA has created a tool that can be used to develop a food defense program. It is based on the acronym A.L.E.R.T. It can be used to help you identify the points in your operation where food is at risk.2-14

15 Deliberate Contamination of FoodAssure Make sure products received are from safe sourcesLook Monitor the security of products in the facilityEmployees Know who is in your facilityReports Keep information related to food defense accessibleThreat Develop a plan for responding to suspicious activity or a threat to the operationInstructor Notes:Assure Make sure that products you receive are from safe sources. Supervise product deliveries. Use approved suppliers who practice food defense. Request that delivery vehicles are locked or sealed.Look Monitor the security of products in the facility. Limit access to prep and storage areas. Locking storage areas is one way to do this. Create a system for handling damaged products. Store chemicals in a secure location. Train staff to spot food defense threats.Employees Know who is in your facility. Limit access to prep and storage areas. Identify all visitors, and verify credentials. Conduct background checks on staff.Reports Keep information related to food defense accessible: receiving logs, office files and documents, staff files, and random food defense self-inspections.Threat Identify what you will do and who you will contact if there is suspicious activity or a threat at your operation. Hold any product you suspect to be contaminated. Contact your regulatory authority immediately. Maintain an emergency contact list.2-15

16 Responding to a Foodborne-Illness OutbreakGather informationAsk the person for general contact informationAsk the person to identify the food eatenAsk for a description of symptomsAsk when the person first got sickNotify authoritiesContact the local regulatory authority if an outbreak is suspectedInstructor Notes:Ask the person making the complaint for general contact information and to identify the food that was eaten. Also ask for a description of symptoms and when the person first got sick.Contact the local regulatory authority if you suspect an outbreak.2-16

17 Responding to a Foodborne-Illness OutbreakSegregate productSet the suspected product aside if any remainsInclude a label with “Do Not Use” and “Do Not Discard” on itDocument the informationLog information about suspected productInclude a product description, product date, lot number, sell-by date, and pack sizeInstructor Notes:Set the suspected product aside if any remains. Include a label with Do Not Use and Do Not Discard on it, as shown in the photo on the slide.Log information about the suspected product. This might include a product description, production date, and lot number. The sell-by date and pack size should also be recorded.2-17

18 Responding to a Foodborne-Illness OutbreakIdentify staffKeep a list of food handlers scheduled at time of incidentInterview staff immediatelyCooperate with authoritiesProvide appropriate documentationReview proceduresDetermine if standards are being metIdentify if standards are not workingInstructor Notes:Maintain a list of food handlers scheduled at the time of the suspected contamination. These staff members may be subject to an interview and sampling by investigators. They should also be interviewed immediately by management about their health status.Cooperate with regulatory authorities in the investigation. Provide appropriate documentation. You may be asked to provide temperature logs, HACCP documents, staff files, etc.Review food-handling procedures to identify if standards are not being met or procedures are not working.2-18