Category Archives: Pathogen

Information – Preventive Controls – A novel approach to kill pathogens utilizing non-flammable alcohol spraying technology:

Food Safety Tech

It is a common misconception that low numbers of Salmonella, Cronobacter and other pathogens are not a problem in low moisture foods because these products do not support growth. Certain organisms can persist for prolonged periods of time in low-moisture products, and heat resistance of Salmonella is greatly increased at reduced water activities in food matrices.

The low water activity level found in most dry ingredients and finished products usually results in severely dehydrated bacteria. It is only when there is adequate moisture, temperature and growing conditions that these stressed bacteria recover and multiply.

Physical cleaning should be followed by chemical or equivalent disinfection procedures and all contact surfaces should be dry before use. If disinfection measures are inadequate, bacteria may adapt to the stress conditions and become more resistant to control efforts. Clean breaks for in-shift sanitizing are becoming more common, so speed of application and drying time must be considered when evaluating new interventions.

Newer technology used in food and medical applications include concentrated alcohol products applied through inert gases to eliminate flammability. Biomist, Inc. has developed new high-grade sanitizing systems and automation for food manufacturers to bolster their sanitation programs by safely applying alcohol-based sanitizers to processing equipment, pneumatic pipes, electronics and other vectors of contamination.

Research – A Systematic Review on the Effectiveness of Pre-Harvest Meat Safety Interventions in Pig Herds to Control Salmonella and Other Foodborne Pathogens

MDPI

myco

This systematic review aimed to assess the effectiveness of pre-harvest interventions to control the main foodborne pathogens in pork in the European Union. A total of 1180 studies were retrieved from PubMed® and Web of Science for 15 pathogens identified as relevant in EFSA’s scientific opinion on the public health hazards related to pork (2011). The study selection focused on controlled studies where a cause–effect could be attributed to the interventions tested, and their effectiveness could be inferred. Altogether, 52 studies published from 1983 to 2020 regarding Campylobacter spp., Clostridium perfringens, Methicillin-resistant Staphylococcus aureusMycobacterium avium, and Salmonella spp. were retained and analysed. Research was mostly focused on Salmonella (n = 43 studies). In-feed and/or water treatments, and vaccination were the most tested interventions and were, overall, successful. However, the previously agreed criteria for this systematic review excluded other effective interventions to control Salmonella and other pathogens, like Yersinia enterocolitica, which is one of the most relevant biological hazards in pork. Examples of such successful interventions are the Specific Pathogen Free herd principle, stamping out and repopulating with disease-free animals. Research on other pathogens (i.e., Hepatitis E, Trichinella spiralis and Toxoplasma gondii) was scarce, with publications focusing on epidemiology, risk factors and/or observational studies. Overall, high herd health coupled with good management and biosecurity were effective to control or prevent most foodborne pathogens in pork at the pre-harvest level. View Full-Text

Australia – Conroy’s Smallgoods various products – Pathogen Contamination

FSANZ

Product information

Conroy’s Smallgoods Pty Ltd is conducting a recall of various products. The products have been available for sale at wholesalers and independent retail stores including IGA in SA and NT.​

Conroy's.PNG
Problem

The recall is due to potential microbial contamination due to routine food safety checks being unable to verify the safety of the manufacturing process for these products.

Food safety hazard

Food products contaminated with pathogens may cause illness if consumed.

Country of origin

Australia

What to do​

Consumers should not eat these products. Any consumers concerned about their health should seek medical advice and should return the products to the place of purchase for a full refund.

For further information please contact:

Conroy’s Smallgoods Pty Ltd

08 8346 5821

Continental Products

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Related links:

UK project gets funding to monitor foodborne pathogens and AMR

Food Safety News

A project in the United Kingdom has received funding for the surveillance of foodborne pathogens and antimicrobial resistance.

Pathogen Surveillance in Agriculture, Food and the Environment (PATH-SAFE) involves the Food Standards Agency (FSA); Food Standards Scotland (FSS); Department of Environment, Food and Rural Affairs (Defra); Department of Health and Social Care (DHSC); Public Health England (PHE); and the Environment Agency.

The aim is to establish the infrastructure and sampling frameworks needed to monitor the source and spread of foodborne pathogens and antimicrobial resistance (AMR) genes between the environment, animals, food and people.

Research – Consumer Knowledge and Behaviors Regarding Food Safety Risks Associated with Wheat Flour

Journal of Food Protection

Consumers do not consider flour, a low-moisture food product, a high risk for microbial contamination. In the past 10 years, however, flour has been identified as a source of pathogenic bacteria, including Salmonella and Escherichia coli. Online surveys were conducted to study consumers’ flour handling practices and knowledge about food safety risks related to flour. The survey also evaluated message impact on three food safety messages in communicating information and convincing consumers to adopt safe flour handling practices. Flour-using consumers (n = 1,045) from the United States reported they used flour to make cakes, cookies, and bread. Most consumers stored flour in sealed containers. Less than 1% kept a record of product identification numbers, such as lot numbers, and less than 11% kept brand and use-by date information. Many consumers (85%) were unaware of flour recalls, or outbreaks, and few (17%) believed they would be affected by flour recalls or outbreaks. If the recall affected the flour they bought, nearly half of the consumers (47%) would buy the same product from a different brand for a few months before they returned to the recalled brand. Among consumers who use flour to bake, 66% said they ate raw cookie dough or batter. Raw dough “eaters” were more difficult to convince to avoid eating and playing with raw flour than “noneaters.” Food safety messages were less impactful on those raw dough eaters than noneaters. Compared with the food safety message with only recommendations, those messages with recommendations and an explanation as to the benefits of the practice were more effective in convincing consumers to change their practices. These findings provide insight into effective consumer education about safe flour handling practices and could assist in the accurate development of risk assessment models related to flour handling.

USA – Timeline for Identifying and Reporting Illnesses in Foodborne Outbreaks

CDC

Ever wonder why the number of illnesses in a foodborne outbreak can increase for weeks, even after the contaminated food is off the market?

A series of events happen before public health officials can report that a case of illness is linked to an outbreak. Each event takes a certain amount of time. This time is known as the “reporting lag” or “lag window” of an outbreak. It is usually 3–4 weeks. For illnesses caused by some bacteria, such as Listeria, it may be longer. Public health officials work to speed up this process when possible.

The steps below outline what typically happens from the day someone eats a contaminated food to the day their illness is linked to a multistate foodborne outbreak investigated by CDC.*

Day 1: You eat a food containing harmful bacteria.
Day 3: You start to feel sick.
  • Symptoms of food poisoning (such as nausea and diarrhea) could start anywhere from a few hours to a few weeks later, depending on the bacteria you ingested. The following chart describes how long it typically takes for someone to have symptoms after being infected with some of the most common foodborne bacteria.
How long it typically takes for someone to have symptoms after being infected with some of the most common foodborne bacteria.
Bacteria Typical start of symptoms
Campylobacter 2–5 days
E. coli 3–4 days
Listeria 1–4 weeks
Salmonella 6 hours–6 days
Vibrio 1-2 days
Should I call the doctor?

Find out when some common food poisoning symptoms are severe enough to need medical attention. See the list

Day 5: You still feel sick with nausea or diarrhea, so you decide to see a healthcare provider.
  • To learn which germ is making you sick, the healthcare provider collects a sample of your stool (poop), urine (pee), or blood.
  • The provider sends your sample to a clinical laboratory for testing.
Day 6: The clinical laboratory tests your sample.
  • After receiving your sample, the laboratory takes 1–3 days to run tests, depending on their capacity.
Day 9: Clinical laboratory test results show what germ is causing your illness.
  • The clinical laboratory identifies the germ making you sick and reports the test results to your healthcare provider.
  • The clinical laboratory should also report test results to the state or local public health department, and they notify CDC.
Days 9–16: The clinical laboratory sends a sample of your bacteria to a public health laboratory.
  • The clinical laboratory ships the bacteria found in your sample to a public health laboratory for whole genome sequencing (WGS) analysis.
  • Shipping can take up to a week, depending on transportation arrangements in your state and the distance between the two laboratories.
Days 16–21: The public health laboratory performs WGS analysis and other tests on the bacteria.
  • The public health laboratory performs tests to determine the bacteria’s DNA fingerprint and other characteristics.
  • WGS testing and analysis of the results, including whether the bacteria is resistant to any antibiotics, can take 2–10 days depending on the bacteria.
What Is Whole Genome Sequencing?

CDC and public health laboratories use a technology called whole genome sequencing (WGS) to generate DNA fingerprints of bacteria causing illness. When bacteria have nearly identical DNA fingerprints, we consider them “genetically closely related.” Illnesses caused by bacteria that are genetically closely related are more likely to have a common source, such as a contaminated food. An outbreak is an event in which a group of people get similar illnesses from a common source. Disease detectives investigate outbreaks to find out what is making people sick.

Find out how CDC uses WGS to detect and solve foodborne outbreaks.

Day 22: The public health laboratory sends WGS results to CDC.
  • Within a day of analyzing the WGS results, state public health officials add the DNA fingerprint from the bacteria to PulseNet, a national laboratory network coordinated by CDC. PulseNet connects foodborne illnesses in order to identify outbreaks.
Day 23: CDC determines if your illness is related to other recent illnesses.
  • CDC scientists determine whether the bacteria causing your illness is closely related genetically to any other recent WGS results from other people in PulseNet.
  • If it is closely related to bacteria causing recent illnesses in other people, CDC may begin an outbreak investigation or add your illness to an ongoing investigation.

Total time: 34 weeks

*Most cases of illness, even those caused by common foodborne germs, are not linked to a foodborne outbreak. This can happen for many reasons. A major reason is that most illnesses are not part of an outbreak. Another reason is that germs that cause foodborne illness can also be spread in other ways, such as by water or directly from one person to another. Also, if an illness is diagnosed by a culture-independent diagnostic test, that case may not be linked to an outbreak because these tests do not provide the information needed to link it to an outbreak. In addition, many people do not seek medical care for foodborne illnesses, so their illnesses cannot be diagnosed or reported to public health officials.

Norway – Research – Risk ranking and source attribution of food- and waterborne pathogens for surveillance purposes – Toxoplasma the top risk!

VKM

Toxoplasma

Background
Providing risk managers with the information that they need for decision making is an important element in food-safety management. The present risk assessment was undertaken to establish a scientific basis that could be used to assist the Norwegian Food Safety Authority (NFSA) in implementing risk-based surveillance, monitoring, and control programmes for pathogens in food and water. The assessment approach used here consisted of two steps:(1) risk ranking of 20 selected pathogens based on the incidence and severity of their associated diseases following infection with the pathogens via food or water, and(2) a source attribution process aimed at identifying the main pathogen-food combinations that may pose a risk to human health for each of the ranked pathogens. We used an expert knowledge elicitation (EKE) procedure with a panel of nine experts, including all eight members of the Panel on Biological Hazards of the Norwegian Scientific Committee for Food and Environment (NSCFE) and one invited expert on food/water-borne viral infections.
Risk Ranking
The 20 pathogens selected for risk ranking were defined in the terms of reference (ToR) received from NFSA. We performed a multicriteria-based ranking of the pathogens in terms of their public health impact from food/water-borne transmission in Norway. The risk ranking utilized six criteria that estimated the incidence of food- and waterborne illness attributable to each pathogen, the severity of acute and chronic illness, the fraction of chronic illness, fatality rate, and the probability for future increased disease burden. For each pathogen, all criteria were scored by the expert panel members, and individual criterion scores were combined into an overall score for every pathogen. To achieve this, each criterion was weighted in terms of its relative importance, as judged by the expert panel. The overall scores so calculated were the basis for the ranking.
Source attribution
For each of the ranked pathogens, the subsequent source-attribution process aimed to identify the main food vehicles, reservoirs, and sources of infection for outbreak-related and sporadic cases of illness, the relative importance of food sources, and preventable risk factors in Norway. To achieve this, both microbiological and epidemiological data were scrutinized. These encompassed results from national surveillance and monitoring programmes, prevalence surveys, outbreak investigations, and research, including analytic epidemiological studies. When Norwegian data were sparse or absent, international reports and research were used.
Results
The six highest-ranked pathogens were, in descending order: Toxoplasma gondii, Campylobacter spp., Echinococcus multilocularis, enterohaemorrhagic E. coli (EHEC), Listeria monocytogenes, and non-typhoid Salmonella. It should be emphasized, however, that confidence intervals revealed considerable overlaps between the scores. The food vehicles associated with the pathogens varied widely. It is notable, however, that fresh produce was identified as being among the main food vehicles for 12 of the 20 pathogens, drinking water was associated with 8, and 5 were linked to raw milk or products thereof

Research – Antimicrobial effect of tea polyphenols against foodborne pathogens

Journal of Food Protection

In recent years, science and technology have developed to a considerable level. However, food contamination by food-borne pathogens is still widespread in many countries around the world, and food safety is a major global public health issue. Therefore, novel preservatives that can guarantee safer food are high in demand. Contrary to artificial food preservatives, tea polyphenols (TP) are getting wide attention as food additives for being “green”, “safe” and “healthy”. The sources of TP are wide, and the purification technology is sophisticated. Compared with other natural antibacterial agents, its antibacterial effect is more stable. It is an excellent natural antibacterial agent. Here, this review systematically summarizes the important chemical components of TP and discusses their antibacterial mechanisms against various foodborne pathogens. In addition, the potential application areas of TP are also discussed. It can provide a theoretical basis for the in-depth study of TP.

Research – Effect of UVC light-emitting diodes on pathogenic bacteria and quality attributes of chicken breast

Journal of Food Protection

This study aimed to investigate the inactivation of foodborne pathogens and the quality characteristics of fresh chicken breasts after Ultraviolet-C light-emitting diode (UVC-LED) treatment. Fresh chicken breasts were separately inoculated with Salmonella Typhimurium, Escherichia coli O157:H7, and Listeria monocytogenes at an initia population of 6.01, 5.80, and 6.22 log 10 CFU/cm 2 , respectively, then were treated by UVC-LED at 1000 to 4000 mJ/cm 2 . UVC-LED irradiation could inactivate the tested bacteria in a dose-dependent manner. After UVC-LED treatment at 4000 mJ/cm 2 , the populations of S . Typhimurium, E . coli O157:H7, and L . monocytogenes on chicken breasts were decreased by 1.90, 2.25, and 2.18 log 10 CFU/cm 2 , respectively. No significant ( P > 0.05) changes were found in the color, pH value, texture properties, and thiobarbituric acid reactive substances (TBARS) values of chicken breasts following the UVC-LED radiation at doses up to 4000 mJ/cm 2 . Overall, this study indicates that UVC-LED is a promising technology to reduce the number of microorganisms while maintaining the physico-chemical characteristics of poultry meat.

Research – Bacteriophages for detection and control of foodborne bacterial pathogens—The case of Bacillus cereus and their phages

Wiley Online

Bacillus cereus is among the primary food‐poisoning pathogenic bacterium that causes diarrhea and emetic types of diseases throughout the world. Recent advances show that bacteriophages become important tools in detection and control of foodborne bacterial pathogens in foods. They gain the interest of researchers for the food industries mainly because they are host‐specific and harmless to humans. Studies showed that bacteriophages could be employed as natural or engineered, whole or part, and temperate or virulent type in designing a range of tools for the detection and control of foodborne bacterial pathogens. This article discusses the recent methods and advances in the utilization strategies of bacteriophages in detection and control of foodborne pathogens, with particular focus on B. cereus pathogen. Moreover, the article presents the latest and relevant information of B. cereus‐infecting phages with respect to their potential applications in foods to address food safety issues. It also reflects future research directions by indicating gap of studies on the area.