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The Unwelcome Dinner Guest - Preventing Foodborne Illness


Reprinted from FDA Consumer - printed March 2003
This article originally appeared in the Nov - Dec 1997 and Jan - Feb 1991 FDA Consumer. Revised March 2003

Publication #  (FDA) 03-1300

Department of Health and Human Services/Food and Drug Administration
FDA on the Internet http://www.fda.gov

We hope you will find this reprint from FDA Consumer, the magazine of the U.S. Food and Drug Administration, to provide a wealth of information on FDA-related issues: food safety, nutrition, drugs, medical devices, cosmetics, radiation protection, vaccines, blood products, and veterinary medicine. For a sample copy of FDA Consumer and a subscription order form, write to: Food and Drug administration, HFI - 40, Rockville, MD 20857

(Subscriptions are reasonably priced at only $14 per year. They make fantastic Christmas gifts for your loving parents, favorite siblings and wonderful mentors!)

The text of this publication is not copyrighted. It is in the public domain and may be republished, reprinted, and otherwise used freely by anyone, without the need to obtain permission from the FDA. Credit to the U.S. Food and Drug Administration as the source is appreciated but not required. We also appreciate being informed about the use of our materials. Contact FDA, HFI-40, Rockville, MD 20857, or e-mail FDAC-queries@oc.fda.gov.
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Preventing Foodborne Illness

"It must be something I ate", is often the explanation people give for a bout of home-grown "Montezuma's Revenge" (acute diarrhea) or some other unwelcome gastrointestinal upset.

Despite the fact that America's food supply is the safest in the world, the unappetizing truth is that what we eat can very well be the vehicle for foodborne illnesses that can cause a variety of unpleasant symptoms and may be life-threatening to the less healthy among us. Seventy-six million cases of foodborne illness occur in the United States every year.

The Food and Drug Administration has given high priority to combating microbial contamination of the food supply. But the agency cannot do the job alone.

Consumers have a part to play, especially when it comes to following safe food-handling practices in the home.

The prime causes of foodborne illness are bacteria, viruses and parasites. Bacteria causing foodborne illness include Escherichia coli O157:H7, Campylobacter jejuni, Salmonella, Staphylococcus aureus, Listeria monocytogenes, Clostridium botulinum, Clostridium perfringens, Vibrio parahaemolyticus, Vibrio vulnificus, and Shigella. Viruses, such as hepatitis A virus and noroviruses, can also cause foodborne illnesses. Parasites are another origin of this type of illness and include Giardia lamblia, Cyclosporia cayetanensis, an Cryptosporidium parvum.

These organisms can become unwelcome guests at the dinner table. They can be in a wide range of foods, including meat, milk, and other dairy products, spices, chocolate, seafood, and even water.

Specific foods that have been implicated in foodborne illnesses are unpasteurized fruit and vegetable juices and ciders; raw or undercooked eggs or foods containing undercoooked eggs; chicken, tuna, potato and macaroni salads; cream-filled pastries; and fresh produce.

Bacteria such as Listeria monocytogenes, Vibrio vulnificus, Vibrio parahaemolyticus, and Salmonella have been found in raw seafood. Oysters, clams, mussels, scallops, and cockles may be contaminated with hepatitis A virus.

Careless food handling sets the stage for the growth of disease-causing "bugs". For example, hot or cold foods left standing too long at room temperature provide an ideal climate for bacteria to grow. Improper cooking also plays a role in foodborne illness.

Foods may be cross-contaminated when cutting boards and kitchen tools that have been used to prepare a contaminated food, such as raw chicken, are not cleaned before being used for another food, such as vegetables that will not be cooked.

Symptoms

Common symptoms of foodborne illness include diarrhea, abdominal cramping, fever, headache, vomiting, severe exhaustion, and sometimes blood or pus in the stools. However, symptoms will vary according to the type of organism and the amount of contaminants eaten.

In rare instances, symptoms may come on as early as a half hour after eating the contaminated food, but they typically do not develop for several days or weeks. Symptoms of viral or parasitic illnesses may not appear for several weeks after exposure. Symptoms usually last only a day or two, but in some cases, can persist a week or 10 days. For most healthy people, foodborne illnesses are neither long-lasting nor life-threatening. However, they can be severe in the very young, the very old, and people with certain diseases and conditions.
Those conditions include:
*liver disease, either from excessive alcohol use, viral hepatitis, or other causes
*hemachromatosis, an iron disorder
*diabetes
*stomach problems, including previous stomach surgery and low stomach acid (for example, from antacid use)
*cancer
*immune disorders, including HIV infection
*long-term steroid use, as for asthma and arthritis

When symptoms are severe, the victim should see a doctor or get emergency help. This is especially important for those who are most vulnerable. For mild cases of foodborne illness, the individual should drink plenty of liquids to replace fluids lost through vomiting and diarrhea.

Prevention Tips

The idea that the food on the dinner table can make someone sick may be disturbing, but there are many steps you can take to protect your families and dinner guests. It is just a matter of following basic rules of food safety.

Prevention of foodborne illness starts with your trip to the supermarket. Pick up your packaged and canned foods first.
*Do not buy food in cans that are bulging or dented or in jars that are cracked or have loose or bulging lids.
*Do not eat raw shellfish and use only pasteurized milk and cheese and pasteurized or otherwise treated ciders and juices if you have a health problem, especially one that may have impaired your immune system.
*Choose eggs that are refrigerated in the store. Before putting them in your cart, open the carton and make sure that the eggs are clean and none are cracked.
*Select frozen foods and perishables such as meat, poultry, or fish last. Always put these products in separate plastic bags so that drippings do not contaminate other foods in your shopping cart.
*Do not buy frozen seafood if the packages are open, torn or crushed on the edges. Avoid packages that are above the frost line in the store's freezer. If the package cover is transparent, look for signs of frost or ice crystals. This could mean that the fish has either been stored for a long time or thawed and refrozen.
*Check for cleanliness at the meat or fish counter and the salad bar. For instance, cooked shrimp lying on the same bed of ice as raw fish could become contaminated.
*When shopping for shellfish, buy from markets that get their supplies from state-approved sources; stay clear of vendors who sell shellfish from roadside stands or the back of a truck. And if you are planning to harvest your own shellfish, heed posted warnings about the safety of the water.
*Take an ice chest along to keep frozen and perishable foods cold if it will take more than an hour to get your groceries home.

Self Storage
*The first rule of food storage in the home is to refrigerate or freeze perishables right away. The refrigerator temperature should be 40 degrees Fahrenheit (5 degrees Celsius), and the freezer should be zero degrees Fahrenheit (minus 18 degrees Celsius). Check both "fridge" and freezer periodically with a refrigerator/freezer thermometer.
*Poultry and meat heading for the refrigerator may be stored as purchased in the plastic wrap for a day or two. If only part of the meat or poultry is going to be used right away, it can be wrapped loosely for refrigerator storage. Just make sure juices cannot escape to contaminate other foods.
*Wrap tightly foods destined for the freezer. Leftovers should be stored in tight containers.
*Store eggs in their carton in the refrigerator itself rather than on the door, where the temperature is warmer.
*Seafood should always be kept in the refrigerator or freezer until preparation time.
*Do not crowd the refrigerator or freezer so tightly that air cannot circulate. Check the leftovers in covered dishes and storage bags daily for spoilage. Anything that looks or smells suspicious should be thrown out.
*A sure sign of spoilage is the presence of mold, which can grow even under refrigeration. While not a major health threat, mold can make food unappetizing.
Most moldy foods should be thrown out. But you might be able to save molding hard cheeses, salami, and firm fruits and vegetables if you cut out not only the mold but a large area around it. Cutting the larger area around the mold is important because much of the mold growth is below the surface of the food.
*Always check the labels on cans or jars to determine how the contents should be stored. Many items besides fresh meats, vegetables, and dairy products need to be kept cold. For instance, mayonnaise and ketchup should go in the refrigerator after opening. If you've neglected to refrigerate items, it is usually best to throw them out.
*Some precautions will help make sure that foods can be stored at room temperature remain safe. Potatoes and onions should not be stored under the sink because leakage from the pipes can damage the food. Potatoes do not belong in the refrigerator, either. Store them in a cool, dry place. Do not store foods near household cleaning products and chemicals.
*Check canned goods to see whether any are sticky on the outside. This may indicate a leak. Newly purchased cans that appear to be leaking should be returned to the store, which should notify the FDA.

Keep It Clean

The first cardinal rule of safe food preparation in the home is: Keep everything clean.

The cleanliness rule applies to the areas where food is prepared, and, most importantly, to the cook.



Posted: August 25, 2005 


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