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Food manufacturers may soon have additional incentive to add yet another weapon – ultraviolet light – to their arsenal in the continuing battle against food-borne pathogens.

Meat processors already go to incredible lengths to clean and sanitize their facilities, but are consistently searching for newer and better technology to sterilize the plant environment. Unfortunately, bacteria such as L. monocytogenes (“Listeria”) can sometimes survive in trace amounts for extended periods in food processing facilities, even though processors dedicate a full shift each day to cleaning disassembled equipment, conveyor belts, walls, ceilings and floors with high-pressure steaming water and powerful sanitizers.

Cleaning aside, a new study published in the journal Foodborne Pathogens and Disease confirmed that Listeria contamination could be significantly reduced on a broad range of conveyor belt surfaces by exposure to UV light. In a controlled environment, researchers introduced the pathogen to conveyor belts made from four different materials and then studied the effects of UV light application at two different intensities and two different time intervals (one and three seconds). After application of UV light for three seconds, the bacterial counts were reduced to below detection levels on three of the belts, and the survival populations on the fourth were considerably diminished. Click on the following link to view an abstract of the Listeria UV Study.

Notably, Listeria has always created unique challenges for industry because of its ability to grow and survive over a broad temperature range. In addition to its natural ability to propagate in cold temperatures, it can also sometimes persist, and be difficult to remove entirely from, food product contact surfaces.

This inherent resilience, of course, can also have a significant economic impact for processors. In 2009, for instance, seven voluntary and precautionary recalls (involving over 45,000 pounds of meat) were announced as a result of possible Listeria contamination. And as we recently reported, the average cost to food companies for a single recall can range as high as approximately $10 million, in addition to potential brand damage and lost sales.

In any event, while researchers and industry continue to assess this promising new data regarding the potential efficacy of UV light on different product contact surfaces, the American Meat Institute Foundation (AMIF) is also inviting pre-proposals on research for controlling Listeria on ready-to-eat meat and poultry products.

Hopefully, such collective efforts will illuminate a clearer path to new and effective interventions designed to eradicate, to the best extent possible, these and other persistent food-borne pathogens.

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According to the CDC, incidence rates of E. coli O157:H7 decreased significantly in 2009 from recent averages, reaching the lowest level since 2004.

Moreover, for the first time, the number of reported cases actually fell below the federal 2010 Healthy People target of less than one case per 100,000 people.

As explained by Dr. David Goldman, assistant administrator of the FSIS Office of Public Health Science, the report “confirms our success in combating food-borne illness by setting an aggressive goal, designing an effective system to meet that goal, and [then] relentlessly implementing it.”

The most recent food-borne illness incidence data was collected and analyzed through FoodNet, a collaborative project including the CDC, USDA, FDA and various state health departments. FoodNet conducts active surveillance for nine pathogens, including Campylobacter, Cryptosporidium, Cyclospora, E. coli O157:H7, Listeria, Salmonella, Shigella, Vibrio and Yersinia. Click on the following link to learn how food-borne illnesses are tracked.

According to Dr. Chris Braden of the CDC, "the report indicates that there have been reductions in illness caused by many of these pathogens." Braden further explained that, “since FoodNet began surveillance in 1996, . . . [most] of the pathogens that we track have all declined."

And, while E. coli O157:H7 and shigella cases showed encouraging recent declines, the federal targets for Campylobacter, Listeria, Salmonella and Vibrio have not yet been met. Vibrio infections, for instance, increased by 85 percent compared with the first three years of surveillance, and Salmonella fell short of the goal.

Many Vibrio infections result from eating raw or undercooked shellfish, especially oysters. In turn, Salmonella is often difficult to combat because it can originate and spread from a wide variety of foods and environmental sources. In addition to foods, Salmonella has been associated with animals like baby chicks, small turtles, reptiles and frogs. And, as noted, while incidence levels for campylobacter and listeria continued to decline significantly, they still did not meet "Healthy People" targets.

In addition to the expected Senate passage of the Food Safety Modernization Act next month, the FDA is also moving forward with additional food safety initiatives aimed at decreasing food-borne illness. Dr. Jeff Farrar, the FDA’s associate commissioner for food protection, noted that the agency is still pursuing new requirements aimed at reducing the incidence of Salmonella during shell egg production. These initiatives are expected to become effective this summer, while FDA also works to develop a proposed rule which will likely include risk-based safety standards for produce.

If we are really serious about reducing food-borne illness, however, such initiatives and regulations are only one part of the overall equation. Much greater progress can likely be achieved – more quickly – if more consumers recognize the importance of properly handling and preparing raw animal foods. If all consumers can be educated to assume raw chicken, meat and eggs carry bacteria that can cause illness, to take additional precautions to avoid cross-contamination, and to cook all raw animal products to a safe temperature, consumers can significantly reduce their risk of becoming ill.

In this regard, better “Educated People” will more quickly and readily translate into far more “Healthy People.”

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All living creatures carry bacteria, and cattle are no exception. For this reason, naturally occurring pathogens may always remain, at least to some extent, an inherent part of the food we eat. And, according to new research, this basic tenet holds true whether beef cattle are raised conventionally, organically or even naturally.

In new study conducted by Kansas State University, researchers have found that the prevalence of E. coli O157:H7 in cattle that are organically or naturally raised is no different than the prevalence in cattle raised conventionally. The study also found that, when compared to conventionally raised beef cattle, organic and natural production had no impact on the antibiotic susceptibility of the bacteria.

As part of the recent study, researchers collected fecal samples from both organically and naturally raised beef cattle, and then tested for the presence of E. coli O157:H7. Results showed prevalence rates of 14.8% in organically raised cattle, and 14.2% in naturally raised cattle. According to the researchers, the E. coli levels were comparable to those previously identified in cattle that had been conventionally raised. Additionally, when the minimum inhibitory concentration of a variety of antibiotics for E. coli O157:H7 isolates were analyzed to determine the effects of all three production systems, no significant difference in antibiotic susceptibility was found. The findings of the study are detailed in the August 2009 issue of Applied and Environmental Microbiology.

Notably, in response to a recent increase in reported food-borne illness outbreaks, and a corresponding shift in consumer demand for organic and natural foods, many cattle farmers have considered shifting toward organic-based production methods. The new study suggests, however, that although organically and naturally raised beef may be popular for their assumed health benefits, neither have demonstrated any effect on the prevalence of naturally occurring pathogens.

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