Category Archives: microbial contamination

Germany -Meat of wild game animals should become safer

BFR

European network aims to further reduce health risks

Game meat, including those of red deer, wild boar, or pheasant, is among the foods with the smallest ecological footprint. These animals grow up in the wild, feeding on what na-ture provides, which also means that they can be exposed to various environmental con-taminants. Furthermore, wild animals can serve as carriers of zoonotic pathogens. The Eu-ropean network ‘Safety in the Game Meat Chain’ that will be established over the next four years under the leadership of the German Federal Institute for Risk Assessment (BfR),and promotes the exchange of knowledge regarding the health risks associated with game meat obtained through hunting for consumers. ‘Our goal is to make this valuable animal-derived food as safe as possible both in Europe and worldwide,’ says BfR President Professor Dr.Dr. Andreas Hensel. ‘We aim to minimize both chemical and microbial risks as much as possi-ble.’ The growing network currently includes 29 countries, encompassing not only EU member states but also non-EU countries, including those in the Western Balkans, Turkey, the United Kingdom, the United States, New Zealand, and Australia.

Over a four-year period, the five working groups of the network will focus on hunting and processing, game meat trade networks and the supply chain, as well as various biological and chemical hazards. To accomplish this, research activities from national level will be compiled and evaluated. Stakeholder groups from academia, industry, governmental institutions, and final consumers will receive ongoing updates on the new findings.

A central aim of the network is direct collaboration with stakeholder groups to translate knowledge into actions along the entire production chain, “from forest to fork” . The focus lies not only on undesirable substances from the environment (environmental con-taminants), but also on preventing or reducing the input of heavy metals, especially lead, from hunting ammunition. The biological hazards range from parasites such as Trichinella larvae, which can be transmitted to humans through the consumption of game meat, all the way to bacterial zoonotic agents including Salmonella and verotoxigenic Escherichia coli (VTEC), as well as viruses like hepatitis E (HEV) in wild boars.

Risks of both chemical and microbial origin that may arise during processing and trade of game meat, potentially contaminating the end product, will also be assessed. The goal is to disseminate scientific knowledge gained through the network from various regions and to align long-term food safety standards across borders.

The network also aims to gather insights into different hunting and training practices as well as national legal regulations and standards on meat inspection and hygiene for game meat in each country. The safety standards for cross-border trade in wild products are intended to be enhanced and harmonized. Additionally, the network places emphasis on educating con-sumers about the risks associated with and safe handling of game meat. Ultimately, this can support the consumer’s confidence in game meat products.

‘Safety in the Game Meat Chain’ is founded by the European Cooperation in Science and Technology (COST).

Useful links

SafeGameMeat COST Action (CA22166):
https://www.cost.eu/actions/CA22166/

Further information from the BfR website on game meat (in German)

SALMONELLA MODULATES METABOLISM DURING GROWTH UNDER CONDITIONS THAT INDUCE EXPRESSION OF VIRULENCE GENES.

SBGR Web

Salmonella enterica serovar Typhimurium (S. Typhimurium) is a facultative pathogen that uses complex mechanisms to invade and proliferate within mammalian host cells. To investigate possible contributions of metabolic processes to virulence in S. Typhimurium grown under conditions known to induce expression of virulence genes, we used a metabolomics-driven systems biology approach coupled with genome-scale modeling. First, we identified distinct metabolite profiles associated with bacteria grown in either rich or virulence-inducing media and report the most comprehensive coverage of the S. Typhimurium metabolome to date. Second, we applied an omics-informed genome-scale modeling analysis of the functional consequences of adaptive alterations in S. Typhimurium metabolism during growth under our conditions. Modeling efforts highlighted a decreased cellular capability to both produce and utilize intracellular amino acids during stationary phase culture in virulence conditions, despite significant abundance increases for these molecules as observed by our metabolomics measurements. Furthermore, analyses of omics data in the context of the metabolic model indicated rewiring of the metabolic network to support pathways associated with virulence. For example, cellular concentrations of polyamines were perturbed, as well as the predicted capacity for secretion and uptake.

Nearly 900 get food poisoning at ‘nagashi somen’ restaurant – Campylobacter

ASAHI

KANAZAWA—Close to 900 people suffered from food poisoning after eating at a “nagashi somen” restaurant in Tsubata, Ishikawa Prefecture.

Nagashi somen is a practice in which customers use chopsticks to try to scoop up thin somen noodles as they flow down a bamboo chute filled with running water.

The Ishikawa prefectural government announced on Oct. 6 that 892 people were certified with food poisoning after dining at the restaurant between Aug. 11 and 17, during the Bon holiday season. While none suffered serious symptoms, 22 were hospitalized.

Many complained of diarrhea and a fever, and 611 were treated at hospitals.

The prefectural government said 1,298 customers submitted complaints, of whom the 892 were certified. They came from 18 prefectures around Japan, including Ishikawa, Toyama, Tokyo, Osaka and Aichi.

Customers who ate the nagashi somen, salt-grilled mountain trout or shaved ice came down with the symptoms, leading the prefectural government to check on the springwater the restaurant used. Officials found campylobacter, a type of bacteria that causes diarrhea, in the water.

The prefectural government ordered the restaurant to suspend operations.

Research – Recent Trends in Active Packaging Using Nanotechnology to Inhibit Oxidation and Microbiological Growth in Muscle Foods

MDPI

Muscle foods are highly perishable products that require the use of additives to inhibit lipid and protein oxidation and/or the growth of spoilage and pathogenic microorganisms. The reduction or replacement of additives used in the food industry is a current trend that requires the support of active-packaging technology to overcome novel challenges in muscle-food preservation. Several nano-sized active substances incorporated in the polymeric matrix of muscle-food packaging were discussed (nanocarriers and nanoparticles of essential oils, metal oxide, extracts, enzymes, bioactive peptides, surfactants, and bacteriophages). In addition, the extension of the shelf life and the inhibitory effects of oxidation and microbial growth obtained during storage were also extensively revised. The use of active packaging in muscle foods to inhibit oxidation and microbial growth is an alternative in the development of clean-label meat and meat products. Although the studies presented serve as a basis for future research, it is important to emphasize the importance of carrying out detailed studies of the possible migration of potentially toxic additives, incorporated in active packaging developed for muscle foods under different storage conditions.

Research – Fate of Planktonic and Biofilm-Derived Listeria monocytogenes on Unwaxed Apples during Air and Controlled Atmosphere Storage

MDPI

Abstract

Multiple recalls and outbreaks involving Listeria monocytogenes-contaminated apples have been linked to the post-harvest packing environment where this pathogen can persist in biofilms. Therefore, this study assessed L. monocytogenes survival on apples as affected by harvest year, apple cultivar, storage atmosphere, and growth conditions. Unwaxed Gala, Granny Smith, and Honeycrisp apples were dip-inoculated in an 8-strain L. monocytogenes cocktail of planktonic- or biofilm-grown cells (~6.5 log CFU/mL), dried, and then examined for numbers of L. monocytogenes during air or controlled atmosphere (CA) (1.5% O2, 1.5% CO2) storage at 2 °C. After 90 days, air or CA storage yielded similar L. monocytogenes survival (p > 0.05), regardless of harvest year. Populations gradually decreased with L. monocytogenes quantifiable in most samples after 7 months. Apple cultivar significantly impacted L. monocytogenes survival (p < 0.05) during both harvest years with greater reductions (p < 0.05) seen on Gala compared to Granny Smith and Honeycrisp. Biofilm-derived cells survived longer (p < 0.05) on L. monocytogenes-inoculated Gala and Honeycrisp apples compared to cells grown planktonically. These findings should aid in the development of improved L. monocytogenes intervention strategies for apple growers and packers.

Sweden – Norovirus behind most outbreaks and illnesses in Sweden

Food Safety News

Food Borne Illness - Norovirus -CDC Photo

Norovirus caused the most outbreaks and illnesses in 2022, according to the Swedish Food Agency (Livsmedelsverket).

Overall, there were 337 reports of suspected or confirmed foodborne illnesses to the agency with 2,261 cases of illness. In 303 events, two or more people were infected from the same source. This is up from 251 outbreaks with 1,467 patients in 2021.

In 2022, the number of food poisonings returned to the level seen before the COVID-19 pandemic. The increase in outbreaks and illnesses began in late 2021, when several restrictions imposed during the pandemic were lifted.

The number of incidents peaked during the last six months of 2022. This was because of four large outbreaks with more than 100 patients during September and December.

USA – Marco’s Italian Restaurant linked to Hepatitis A scare

Food Poison Journal

The Maine Center for Disease Control and Prevention (Maine CDC) has identified a case of hepatitis A in a Lewiston food service worker. Hepatitis A is a contagious liver disease caused by the hepatitis A virus. It can spread through person-to-person contact or by consuming contaminated food or water.

The individual worked during their infectious period at Marco’s Italian Restaurant, 12 Mollison Way in Lewiston on the following dates: September 11, 13, 15–16, 18, 20-22, 25, and 27-28, 2023. Anyone who purchased and/or ate food or drink from this restaurant during these days could be at risk for hepatitis A infection. An infected person can spread the virus to others from about two weeks before symptom onset until one week after symptoms begin.

RASFF Alert- Microbial and Chemical spoilage of food for special medical purpos

RASFF

Microbial and Chemical spoilage of food for special medical purposes from the UK in Malta

Research – Combining High-Pressure Processing and Supercritical Carbon Dioxide for Inactivation of Listeria innocua

MDPI

Abstract

The effect of high-pressure treatment with supercritical CO2 on the inactivation of Listeria innocua in a fish soup was investigated. The soup was inoculated with L. innocua, packaged in modified atmosphere with 50:50 or 95:5 CO2:N2, high-pressure processed (300, 350, 400 and 600 MPa, 2 min) under subcritical (T < 304 K) or supercritical conditions (T > 304 K) and stored at 4 °C for up to 53 days. Treatment at 400 and 600 MPa had a significant (p < 0.05) effect on L. innocua under both supercritical and subcritical conditions. In contrast, pressurization at 350 MPa and supercritical conditions were needed to significantly (p < 0.05) inactive L. innocua. Increased levels of CO2 in the headspace significantly (p < 0.05) reduced the bacterial load during processing, and supercritical conditions had a significant (p < 0.01) interaction with both CO2 levels and pressure. Increased storage time gave significantly increased levels of L. innocua at 400 and 600 MPa. In addition, high levels of CO2 significantly decreased (p < 0.001) growth. However, 350 MPa under supercritical conditions seemed to set the L. innocua in a permanent lag phase, with slow and steadily decreasing numbers of bacteria during storage. All the design variables resulted in significant inactivation of L. innocua, and supercritical conditions combined with high levels of CO2 inhibited the recovery of L. innocua to a large degree.

USA – Patient count more than doubles in Salmonella outbreak linked to taqueria

Food Safety News

Chicago’s Department of Public Health has confirmed 55 Salmonella infections stemming from the outbreak at an Avondale taqueria, Carniceria Guanajuato, up from 20 last week.

At least 17 people have been hospitalized as of Sept. 30.

An investigation into the source of the bacteria is ongoing. The restaurant remains closed as owners work with public officials to bring the eatery up to safety standards.

Carniceria Guanajuato was inspected Sept. 8 after reports of food poisoning. City health inspectors found raw beef and raw shelled eggs stored above ready-to-eat lettuce and improper storage of hot and cold foods, among other violations.