Category Archives: Decontamination Microbial

USA – Bring Food Safety to Your Summer Vacation

FSIS USDA

As summertime brings families and friends together for outdoor celebrations, the U.S. Department of Agriculture (USDA) wants to make sure your summer festivities are food safe. Whether you’re grilling burgers, camping, or having a picnic, everyone should always remember to practice proper handwashing and use a food thermometer.

After observing that consumer behavior in test kitchens revealed that people are skipping basic food safety practices, USDA is concerned that consumers are not doing enough to reduce the risk of foodborne illness.

“Our research shows that participants were not adequately washing their hands or using a food thermometer,” says USDA Deputy Under Secretary for Food Safety Sandra Eskin “Summer is a time to relax and enjoy delicious meals with friends and family but foodborne pathogens never rest. Following safe food handling practices during this and all other seasons can reduce the risk of you and your loved ones getting sick.”

USDA encourages all Americans to follow these food safety tips to keep you and your family foodborne illness free this summer.

Wash Your Hands

Inadequate handwashing is a contributing factor to many illnesses, including foodborne illness. It is important to follow proper handwashing steps before, during, and after preparing food to prevent bacteria from transferring from your hands to your meal.

Recent USDA consumer research (January 2020-2021) showed that 56% of participants didn’t attempt to wash their hands during meal preparation. This is a major drop in handwashing attempts from prior years’ research. In year 3, this figure was 71% and in year 2 it was 74%.

In addition to low attempts at handwashing, roughly 95% of participants failed to wash their hands properly. The most common reason in the study for unsuccessful handwashing was failing to rub hands with soap for at least 20 seconds, followed by not wetting hands with water as a first step.

There are five steps for proper handwashing: wet hands, lather with soap, scrub for 20 seconds, rinse, and dry.

Use a Food Thermometer

Don’t forget to bring a food thermometer to your summer activities. Always use a food thermometer to check the internal temperature of your food to determine if it is safe to eat. Insert the thermometer into the thickest part of the meat, through the side, for the most accurate temperature reading. In the study, only 55% of participants used a food thermometer to check the internal temperature of the hamburgers and sausages they were cooking. Use a food thermometer to ensure the following foods have reached their safe internal temperature:

  • Beef, pork, lamb and veal steaks, chops and roasts: 145 F with a 3-minute rest
  • Fish: 145 F
  • Egg dishes: 160 F
  • Ground meats (beef, pork, lamb and veal): 160 F
  • All poultry (whole or ground): 165 F

Avoid Cross-Contamination

While preparing your meal this Memorial Day, be sure to keep your raw meat separate from your fruits and vegetables. Raw meat and poultry can carry bacteria that causes foodborne illness. To reduce the risk of cross-contamination, USDA recommends using separate cutting boards: one for raw meat and poultry, and another for fruits and vegetables.

In this study, cross-contamination was prevalent. Across all participants:

  • 32% contaminated their plates and cutting boards while preparing food.
  • 28% contaminated their kitchen sinks.
  • 12% contaminated spice containers.
  • 8% contaminated the cupboard handles in their kitchen.

These findings are part of a multi-year, mixed-method study that USDA’s Food Safety and Inspection Service (FSIS) commissioned to evaluate various consumer food handling behaviors. The study uses test kitchens, focus groups, and nationally representative surveys to better understand food safety practices and experiences with food recalls, foodborne illness, and FSIS food safety resources. More information about this study is available in an executive summary.

Research – An Exploration of Listeria monocytogenes, Its Influence on the UK Food Industry and Future Public Health Strategies

MDPI

Listeria monocytogenes is a Gram-positive intracellular pathogen that can cause listeriosis, an invasive disease affecting pregnant women, neonates, the elderly, and immunocompromised individuals. Principally foodborne, the pathogen is transmitted typically through contaminated foods. As a result, food manufacturers exert considerable efforts to eliminate L. monocytogenes from foodstuffs and the environment through food processing and disinfection. However, L. monocytogenes demonstrates a range of environmental stress tolerances, resulting in persistent colonies that act as reservoirs for the reintroduction of L. monocytogenes to food contact surfaces and food. Novel technologies for the rapid detection of L. monocytogenes and disinfection of food manufacturing industries have been developed to overcome these obstacles to minimise the risk of outbreaks and sporadic cases of listeriosis. This review is aimed at exploring L. monocytogenes in the UK, providing a summary of outbreaks, current routine microbiological testing and the increasing awareness of biocide tolerances. Recommendations for future research in the UK are made, pertaining to expanding the understanding of L. monocytogenes dissemination in the UK food industry and the continuation of novel technological developments for disinfection of food and the food manufacturing environment View Full-Text

EU – Update: Multi-country Salmonella outbreak linked to chocolate products

EFSA

EFSA and ECDC have updated their assessment, published in April 2022, of the multi-country outbreak of monophasic Salmonella Typhimurium infections linked to chocolate products by a company in its Belgian plant.

Cases, which have now started to decrease, stood at 324 (including both probable and confirmed) in the EU/EEA and the UK, as of 18 May 2022. They have been reported in twelve EU/EEA countries (Austria, Belgium, Denmark, France, Germany, Ireland, Italy, Luxembourg, the Netherlands, Norway, Spain and Sweden), the UK, Switzerland, Canada, and USA. The first patient was reported in the UK on 7 January, with a sampling date of 21 December 2021.

On 8 April 2022, the food safety authority in Belgium stopped the production at the facility. Withdrawals and recalls have been implemented in the countries where chocolate products manufactured at the Belgian plant were distributed. Public warnings have been issued by the competent national authorities in different countries.

India – Telangana: Now report food safety and quality issues through social media

Telangana Today

Hyderabad: To address grievances related to food poisoning, lack of quality and safety in food products and ingredients, the Telangana government on Sunday has urged people to call (040-21111111) or reach out to food safety officials through micro-blogging social media platform Twitter (@AFCGHMC) for quick redressal.

State Health Minister, T Harish Rao, in a review meeting here on Sunday with officials from Commissioner of Food Safety, Institute of Preventive Medicine (IPM) and food safety inspectors from all the districts and senior health officials, assured people that quick food safety checks will be conducted by food safety officials after receiving complaints through the call centre or the Twitter handle @AFCGHMC.

Research – Penn State microbiologists receive USDA grant to study biofilms guarding Listeria

Food Safety News

The U.S. Department of Agriculture has awarded a $605,000 grant to microbiologists in Penn State’s College of Agricultural Sciences to study how microbial biofilms protect Listeria monocytogenes.

“Microorganisms enclosed in a biofilm produce slimy substances that protect them from the antimicrobial activity of sanitizing chemicals by slowing down their penetration into the core of a biofilm,” Jasna Kovac, Lester Earl and Veronica Casida Career Development Professor of Food Safety and Assistant Professor of Food Science said.

“Biofilm formation can therefore result in reduced efficacy of antimicrobial sanitizers used to inactivate Listeria. This project will investigate the interactions between microorganisms found in fruit-packing environments and Listeria monocytogenes.”

Along with Kovac, Luke LaBorde, professor of Food Science, will use the funding from USDA’s National Institute of Food and Agriculture to conduct research on the interactions between microorganisms found in fruit-packing environments and Listeria monocytogenes.

According to LaBorde, because the role of the food-processing environment microbiota on Listeria monocytogenes survival within a biofilm under sanitizer pressure is poorly understood, the researchers will evaluate the ability of the most relevant environmental microbiota found in produce-packing environments to form single- and multi-species biofilms with Listeria monocytogenes.

Research – IAFNS presents new research on pathogens and low-moisture foods

Food Safety News

New research on hazards in low-moisture foods fills critical knowledge gaps and identifies cutting-edge decontamination tools. The Institute for the Advancement of Food and Nutrition Sciences hopes the study will empower food safety professionals to reduce risks in the foods and prevent foodborne illness outbreaks.

Because the persistence of pathogens and viruses in ingredients and ready-to-eat foods has wide-ranging impacts on our food supply, the Institute for the Advancement of Food and Nutrition Sciences (IAFNS) is supporting a body of research on this topic. The studies focus on low-moisture foods such as nuts, dried fruits, cereal products and chocolate. These foods are often ingrediates in other foods, so they can potentially amplify outbreaks and recalls over a wide variety of products, according to researchers.

These studies were performed as part of a multi-center research collaboration between the University of Guelph, Health Canada and North Carolina State University. This collaboration enabled the investigators’ diverse perspectives and expertise to strengthen this line of research.

According to Jeff Farber of the University of Guelph, “the increased awareness of the importance of low-moisture foods (LMF) as a possible vehicle for foodborne illness has already led to better approaches toward prevention and control and will continue to do so in the future.”

Read More at the link above.

Research – Inactivation of Foodborne Pathogens on Inshell Walnuts by UV-C Radiation

Journal of Food Protection

Inshell walnuts could be contaminated with pathogens through direct contact or cross-contamination during harvesting and postharvest hulling, drying, or storage. This study aimed to assess the efficacy of ultraviolet–C (UV–C) radiation in inactivating foodborne pathogens on inshell walnut surfaces. Intact inshell walnut surfaces were inoculated separately with Salmonella spp., Escherichia coli O157:H7, Listeria monocytogenes , and Staphylococcus aureus , and then subjected to UV–C radiation at doses of 29.4, 147.0, 294.0, 588.0, and 882.0 mJ/cm 2 . UV–C radiation inactivated the inoculated pathogens in a dose-dependent manner, and a tailing effect was observed for the inactivation of pathogens. UV–C radiation at 29.4 mJ/cm 2 and 882.0 mJ/cm 2 reduced the populations of  S . Enteritidis PT 30, S . Typhimurium, E. coli O157:H7, L. monocytogenes , and S. aureus on inshell walnut surfaces by 0.82–1.25 and 1.76–2.41 log CFU/walnut, respectively. Scanning electron photomicrographs showed pathogenic bacterial cells in the cracks and crevices of the inshell walnut surface, and the shielding of microorganisms by the cracks and crevices may have contributed to the tailing effect observed during UV–C inactivation. No significant changes ( p  > 0.05) were found in walnut lipid oxidation following UV–C radiation at doses up to 882.0 mJ/cm 2 . Together, the results indicate that UV–C radiation could be a potential technology for reducing the populations of various foodborne pathogens on inshell walnut surfaces while maintaining the quality of walnuts.

Research – Dutch survey finds a quarter of people wash chicken, despite expert advice

Food Safety News

A survey in the Netherlands has found more than a quarter of people wash raw chicken, which public health officials say increases the chances of spreading bacteria.

Results come from two surveys by the Netherlands Nutrition Centre (Voedingscentrum) with the Dutch population about safe food handling.

The first survey in May 2021 with 2,000 participants asked Dutch consumers about general food safety handling in the domestic kitchen. One of the questions was if they washed their chicken.

A second survey in November 2021 with 1,000 respondents was focused on safe handling of chicken. People were asked if they washed their chicken and more details about why and how. Both surveys revealed that more than 25 percent of consumers washed their chicken often or almost always.

Bacteria on chicken can cause food poisoning. Usually it is because of Campylobacter or Salmonella.

Washing raw poultry is not recommended, because of concerns about contaminating other foods and surfaces and increasing the risk of foodborne illness.

Research – Attachment and survival of Salmonella enterica and Listeria monocytogenes on tomatoes (Solanum lycopersicum) as affected by relative humidity, temperature and time of storage 

Journal of Food Protection

Tomatoes (Solanum lycopersicum) are one of the most consumed fruits worldwide. The fruit can become contaminated with Salmonella and Listeria monocytogenes at different stages of the production and supply chain, and these pathogens may survive under different storage conditions. The effect of relative humidity, temperature and time of storage on the attachment and survival characteristics of both pathogens on the surface of tomatoes was investigated. Fresh whole Roma tomatoes were inoculated with a cocktail of Salmonella or L. monocytogenes and stored at 5, 12, 25, 30, or 35 ºC for 10 days. Every day during storage, relative humidity and temperature were measured and tomatoes were removed to enumerate cells of these pathogens that were loosely attached (LA, cells detached from the tomato surface by simple rinse) and strongly attached (SA, cells that required sonication to detach. Enumeration was achieved by spread-plate method. Surviving populations of LA and SA cells were obtained and the attachment strength (SR) was calculated to express the proportion of SA cells on the tomato surface. The LA initial counts of Salmonella and L. monocytogenes on the surface of the fruit after inoculation were 6.6 and 6.5 log CFU/tomato, and for SA were 5.1 and 5.6 log CFU/tomato, respectively. For both pathogens, the LA counts were higher (p < 0.05) than the SA counts. Also, the LA and SA counts varied significantly as a function of temperature, relative humidity and time of storage. The S R for Salmonella was affected by the time but not the temperature of storage, while the S R for L. monocytogenes was affected by the temperature, relative humidity and time of storage (p < 0.05). Understanding the attachment and survival of Salmonella and L. monocytogenes on tomatoes stored at different temperature conditions may be useful in determining ways to prevent/reduce the establishment of pathogens and designing improved decontamination methods for tomatoes.

Research – Evaluation of the safety and efficacy of lactic acid to reduce microbiological surface contamination on carcases from kangaroos, wild pigs, goats and sheep

EFSA

Studies evaluating the safety and efficacy of lactic acid to reduce microbiological surface contamination from carcases of wild game (i.e. kangaroos and wild pigs) and small stock (i.e. goats and sheep) before chilling at the slaughterhouse were assessed. Wild pig and kangaroo hide‐on carcases may have been chilled before they arrive at the slaughterhouse and are treated after removal of the hides. Lactic acid solutions (2–5%) are applied to the carcases at temperatures of up to 55°C by spraying or misting. The treatment lasts 6–7 s per carcass side. The Panel concluded that: [1] the treatment is of no safety concern, provided that the lactic acid complies with the European Union specifications for food additives; [2] based on the available evidence, it was not possible to conclude on the efficacy of spraying or misting lactic acid on kangaroo, wild pig, goats and sheep carcases; [3] treatment of the above‐mentioned carcases with lactic acid may induce reduced susceptibility to the same substance, but this can be minimised; there is currently no evidence that prior exposure of food‐borne pathogens to lactic acid leads to the occurrence of resistance levels that compromise antimicrobial therapy; and [4] the release of lactic acid is not of concern for the environment, assuming that wastewaters released by the slaughterhouses are treated on‐site, if necessary, to counter the potentially low pH caused by lactic acid, in compliance with local rules.