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Publication #FSHN12-10

Food Safety within the Household1

Lucianna Grasso, George L. Baker, Renée M. Goodrich-Schneider, and Keith R. Schneider2

In 2008, foodborne disease outbreaks in the United States resulted in 23,152 documented illnesses (CDC 2011a). Approximately 15% of these incidents originated at home, ranking the household as the second most common setting where foodborne illness takes place. Bacterial pathogens were the predominant cause of private home foodborne illness episodes, of which the top three causal agents were Campylobacter, Salmonella, and Shiga toxin-producing Escherichia coli (e.g., serovars O104, O111, O157:H7, and others) (CDC 2011b).

Household Risks and How They Occur

Campylobacter

Campylobacter is the primary cause of bacterial foodborne gastroenteritis, which causes symptoms such as acute diarrhea and vomiting (Blackburn and McClure 2009). Campylobacteriosis is often a result of consuming undercooked poultry and meat, contaminated water, raw milk, and salad vegetables. Cross contamination due to inadequate hygiene practices within the kitchen is a high risk factor for contracting Campylobacter. A study conducted in 2000 revealed that home-cooked chicken was linked to higher incidences of Campylobacter infections, compared to other food sources (Studahl 2000).

Figure 1. 

Food preparation area in the home kitchen


Credit:

USDA photo


[Click thumbnail to enlarge.]

Salmonella

Resultant symptoms from Salmonella infections can cause serious illness and even death; symptoms include acute diarrhea, vomiting, dehydration, septicemia or bacteremia (when the bacteria enter the bloodstream) (Bell and Kyriakides 2009a). Possible secondary illnesses associated with this infection are reactive arthritis, meningitis, and urinary tract infections. Salmonella is often linked to egg and egg-based products as well as chicken and other poultry, but produce, fruits, chocolate, and nuts have also been associated with this microorganism. These food sources may become contaminated with Salmonella by contact with fecal matter (either directly or through cross contamination), inadequate cooking techniques, and cross contamination due to poor personal hygiene or improperly cleaned equipment. In a survey performed in Australia, about 90% of Salmonella infections were found to have been associated with manufactured foods and food handling practices in the home (Jay et al. 1999).

Shiga toxin-producing E. coli (STEC)

Shiga toxin-producing Escherichia coli (STEC) bacteria, such as E. coli O157:H7, can cause severe abdominal cramping, bloody diarrhea, and vomiting (Bell and Kyriakides 2009b). STEC infections can lead to hemolytic uremic syndrome (HUS), which is potentially fatal, especially in young children. E. coli O157:H7 infections might occur from consuming contaminated food or water products, undercooked meat, unpasteurized milk products, and leafy green vegetables. The majority of hamburgers associated with E. coli O157:H7 infections in a survey conducted in Canada were cooked and/or consumed at home (Saux et al. 1993).

Risk Reduction Requires Knowledge and Behavior Change

Even though the number of foodborne illness cases occurring in domestic settings appears to be decreasing, educating consumers on home food safety is of the utmost importance (Scott 2003). Having insufficient knowledge of the risks associated at each level of food preparation can increase the number of incidents of foodborne illnesses at home (Collins 1997). Yet, the correlation between knowledge of proper hygiene practices and actual hygienic behavior in the home kitchen is still low among consumers (Worsfold and Griffith 1997).

The most common food-safety handling mistakes that occur within the household are improper food storage, inadequate cooking or reheating temperatures, cross contamination, and infected food handlers (Scott 2003). However, research has shown that maintaining good hygiene practices can greatly help reduce many of the occurrences of foodborne illnesses (Scott 1996).

Food Storage

There are many guidelines for storing food in an adequate manner. To minimize microbial growth, cooked food should be stored in the refrigerator or freezer (IFH 2004). Refrigeration temperatures should be below 40°F and freezer temperatures should be below 0°F. Refrigeration temperatures do not eliminate the potential growth of pathogenic bacteria. As a general rule of thumb, food stored in the refrigerator as leftovers should be used within 3–5 days, and expiration dates for foods should also be checked regularly and items discarded as needed (NNC 1999). Thawing frozen food may be accomplished by placing item in the refrigerator until ready, submerging the item under running cold water (below 70°F), or defrosting it in a microwave oven (Washington State Department of Health 2005). Raw foods and cooked foods should be kept separate in the refrigerator in order to prevent contamination between the two, and each item should be covered or wrapped (IFH 2004).

Cooking and Reheating

Cooking foods properly is of equal importance. All cooking equipment (e.g., ovens and microwaves) should be used as instructed in the manufacturer’s guide and maintained and cleaned (IFH 2004). Internal cooking temperatures should reach and sustain the safe minimum as recommended in Table 1 and should be checked with the appropriate food thermometer in accordance with these latest USDA guidelines.

Table 1. 

Safe Minimum Cooking Temperatures Chart (USDA, 2011)

Category

Food

Temperature (°F)

Rest Time

Ground meat & meat mixtures

Beef, Pork, Veal, Lamb

160

None

Turkey, Chicken

165

None

Whole cuts of beef/veal/lamb

Steaks, roasts, chops

145

3 minutes

Whole cuts of poultry

Chicken & Turkey, whole

165

None

Poultry breasts, roasts

165

None

Poultry thighs, legs, wings

165

None

Duck & Goose

165

None

Stuffing (cooked alone or in bird)

165

None

Whole cuts of pork

Fresh pork chops, loin

145

3 minutes

Fresh ham (raw)

145

3 minutes

Precooked ham (to reheat)

140

None

Eggs & egg dishes

Eggs

Cook until yolk and white are firm

None

Egg dishes

160

None

Leftovers & Casseroles

Leftovers

165

None

Casseroles

165

None

Seafood

Fin Fish

145 or cook until flesh is opaque and separates easily with a fork.

None

Shrimp, lobster, and crabs

Cook until flesh is pearly and opaque.

None

Clams, oysters, and mussels

Cook until shells open during cooking.

None

Scallops

Cook until flesh is milky white or opaque and firm.

None

Source: USDA, Keep Food Safe (http://www.foodsafety.gov/keep/charts/mintemp.html)

Keeping It Clean

High-risk sources of contamination in the kitchen where cross contamination may occur include hands and food-contact surfaces (IFH 2004). It is very important to adequately wash hands and food-contact surfaces after they’ve come in contact with raw meat (IFH 2004; Washington State Department of Health 2005).

Food-contact surfaces

Food-contact surfaces (cutting boards and counter tops) should be washed with warm, soapy water and a sanitizing solution soon after coming into contact with high-risk food items (NNC 1999; IFH 2004). The use of a dishwasher has been found to be more effective in reducing contamination of cutting boards and flatware than washing them by hand (NNC 1999).

Hand hygiene

In general, hand washing with soap and water should be performed prior to handling any kind of food, eating, and after using the restroom, handling a pet or child, after contact with any other potentially contaminated reservoir or disseminator, and whenever the hands are visibly dirty (IFH 2004). Hand washing helps reduce the risk of contamination from an infected food handler (IFH 2004).

Resources for Educators

Healthy People 2020, an initiative set forth by the US Department of Health and Human Services, has already begun to outline objectives that will improve these food safety practices among consumers (DOH 2011). These objectives (Figure 1) aim to increase the number of people who wash hands and food contact surfaces (CLEAN), do not cross contaminate (SEPARATE), cook to adequate temperatures (COOK) and refrigerate promptly (CHILL). Thus, adequate hygiene factors are the basis of many educational and assistance programs to help food handlers at home with food safety. Each of these food safety goals can be traced back to the general conclusion that prevention of foodborne illness occurs through proper food preparation and sanitation techniques (Collins 1997).

Figure 2. 

CLEAN–SEPARATE–COOK–CHILL / LIMPIAR–SEPARAR–COCINAR–ENFRIAR


Credit:

http://www.healthypeople.gov/


[Click thumbnail to enlarge.]

The Partnership for Food Safety Education works toward eliminating illness and death from foodborne diseases through various educational campaigns. This non-profit organization was established in 1997 in response to the need for programs that bring education and awareness of food safety to all consumers, especially at risk populations, such as pregnant women, young children, the elderly, and immuno-compromised individuals. Food-safety education programs provide information on foodborne illness, from the causes to the costs to society, and curricula for school-aged children. As well, various food safety education campaigns, such as Fight BAC! and Be Food Safe, increase the knowledge of food safety at home and these promote lifestyle changes (The Partnership for Food Safety 2011a).

Another newly established campaign, Food Safe Families, is a collaborative project of the USDA’s Food Safety Inspection Service (FSIS), the US Food and Drug Administration (FDA), and the Centers for Disease Control and Prevention (CDC). Its aim is to raise awareness about foodborne illness and encourage consumers to make lifestyle changes that lower their risk of contracting foodborne illness and practice safe food-handling techniques. The target audiences are English- and Spanish-speaking families who cook at least four times a week (USDA-FSIS 2011)

Closing Remarks

Although food safety education is well established, people still become infected with foodborne illnesses by practicing unsafe behaviors in their kitchen. Individuals who know the basics of home food safety may not always put these theories into practice. Because of this, the goal of Healthy People 2020 is aimed to change current consumer behaviors towards food safety within the public domain (DOH 2011). While over 50 percent of consumers perform well in each food-safety category, the Department of Health and Human Services believes more Americans should be exceeding such standards (DOH 2011). In order to decrease associated food safety risks at home, consumers must become increasingly knowledgeable of how food becomes unsafe to consume and modify their current beliefs and behaviors (Worsfold and Griffith 1997).

References

Bell, C., and A. Kyriakides. 2009a. Salmonella. In Foodborne Pathogens – Hazards, Risk Analysis and Control, 2nd ed., Clive de W. Blackburn and Peter J. McClure, eds., 581–674. Cambridge: CRC Press/Woodhead Publishing Limited. Available from http://www.knovel.com/web/portal/basic_search/display?_EXT_KNOVEL_DISPLAY_bookid=2596 (accessed 2011 Nov. 16).

Bell. C., and A. Kyriakides. 2009b. Pathogenic Escherichia coli. In Foodborne Pathogens – Hazards, Risk Analysis and Control, 2nd ed., Clive de W. Blackburn and Peter J. McClure, eds., 581–674. Cambridge: CRC Press/Woodhead Publishing Limited. Available from http://www.knovel.com/web/portal/basic_search/display?_EXT_KNOVEL_DISPLAY_bookid=2596 (accessed 2011 Nov. 16).

Blackburn, C. de W., and P. J. McClure. 2009. Campylobacter and Arcobacter. In Foodborne Pathogens – Hazards, Risk Analysis and Control, 2nd ed., Clive de W. Blackburn and Peter J. McClure, eds., 581–674. Cambridge: CRC Press/Woodhead Publishing Limited. Available from http://www.knovel.com/web/portal/basic_search/display?_EXT_KNOVEL_DISPLAY_bookid=2596 (accessed 2011 Nov. 16).

[CDC] Centers for Disease Control and Prevention. 2011a. Surveillance for foodborne disease outbreaks—United States, 2008. Morbidity and Mortality Weekly Report 2011. Available from http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6035a3.htm?s_cid=mm6035a3_w (accessed 2011 Oct. 31).

[CDC] Centers for Disease Control and Prevention. 2011b. Table 3. Number of reported foodborne disease outbreaks and outbreak-associated illnesses, by etiology and place where food was eaten—United States, 2008. Morbidity and Mortality Weekly Report 2011. Available from http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6035a3.htm?s_cid=mm6035a3_wf (accessed 6 March 2013).

Collins, J. E. 1997. Impact of changing consumer lifestyles on the emergence/reemergence of foodborne pathogens. Emerging Infectious Diseases 3(4): 471–79. Available from http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2640078/pdf/9366599.pdf (accessed 2011 Nov. 12).

[DOH] U. S. Department of Health and Human Services, Office of Disease Prevention and Health Promotion. Healthy People 2020 website. Washington, DC. Available from http://www.healthypeople.gov/ (accessed 2012 Oct. 30).

[IFH] International Scientific Forum on Home Hygiene. 2004. Guidelines for Prevention of Infection and Cross Infection in the Domestic Environment, 2nd ed. Milan: Intramed Communications. Available from http://www.ifh-homehygiene.org/integratedcrd.nsf/a639aacb2d462a2180257506004d35db/92111AE38986BFBB802574DD003FC2C1/$File/IFH-Guidelines-complete.pdf (accessed 2012 Nov. 5).

Jay, L., D. Comar, and L. D. Govenlock. 1999. A video study of Australian domestic food-handling practices. Journal of Food Protection 62: 1285–96.

[NNC] Netherlands Nutrition Centre. 1999. Hygiene code for the private household. Available from http://www.nutricion.org/publicaciones/pdf/hygiene_codehouses.pdf (accessed 2011 Dec. 2).

Saux, N. L., J. S. Spika, B. Friesen, I. Johnson, D. Melnychuck, C. Anderson, R. Dion, M. Rahman, and W. Tostowaryk, W. 1993. Ground beef consumption in noncommercial settings is a risk factor for sporadic Escherichia coli O157:H7 infection in Canada. The Journal of Infectious Diseases 167(2): 500–2. Available from http://www.jstor.org/stable/30113114 (accessed 2011 Nov. 14).

Scott, E. 1996. Foodborne disease and other hygiene issues in the home. Journal of Applied Bacteriology 80(1): 5–9. doi: 10.1111/j.1365-2672.1996.tb03181.x.

Scott, E. 2003. Food safety and foodborne disease in 21st century homes. The Canadian Journal of Infectious Diseases 14(5): 277–80. Available from http://www.ncbi.nlm.nih.gov.lp.hscl.ufl.edu/pmc/articles/PMC2094945/pdf/JID14277.pdf (accessed 2011 Nov. 13).

Studahl, A., and Y. Anderson. 2000. Risk factors for indigenous Campylobacter infection: a Swedish case control study. Epidemiology and Infection 125(2): 269–75 Available from http://journals.cambridge.org.lp.hscl.ufl.edu/abstract_S0950268899004562 (accessed 2011 Nov. 14).

The Partnership for Food Safety Education. Fight BAC!® campaign website. 2011a. Available from http://www.fightbac.org (accessed 2011 Nov. 13).

The Partnership for Food Safety Education. 2011b. Holiday food safety success kit. Available from http://www.fightbac.org (accessed 2011 Nov. 13).

[USDA-FSIS] U.S. Department of Agriculture, Food Safety Inspection Service. 2011. Food Safe Families website. Available from http://foodsafety.adcouncil.org/ (accessed 2011 Nov. 13).

Washington State Department of Health. 2005. Food Safety Is Everybody’s Business – Your guide to preventing foodborne illness, Washington State Food & Beverage Workers' Manual (DOH Pub 332-036). Available from http://www.doh.wa.gov/ehp/food/workermanual.pdf (accessed 2011 Dec. 2).

Worsfold, D., and C. Griffith. 1997. Food safety behaviour in the home. British Food Journal 99(3): 97–104. doi: 10.1108/00070709710168932.

Footnotes

1.

This document is FSHN12-10, one of a series of the Food Science and Human Nutrition Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Original publication date October 2012. Visit the EDIS website at http://edis.ifas.ufl.edu/.

2.

Lucianna Grasso, student; George L. Baker, assistant scientist; Renée M. Goodrich-Schneider, associate professor; Keith R. Schneider, contact author and associate professor; Food Science and Human Nutrition Department, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611-0370.


The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other UF/IFAS Extension publications, contact your county's UF/IFAS Extension office.

U.S. Department of Agriculture, UF/IFAS Extension Service, University of Florida, IFAS, Florida A & M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.