Category Archives: Microbial growth

Taiwan – Over 20 Taiwanese elementary students suffer food poisoning from school lunches

Taiwan News

TAIPEI (Taiwan News) — As of Saturday (Oct. 14) night, more than 20 elementary students in Keelung City were admitted to the hospital due to food poisoning from school food.

The students, who all attend Shen-Mei Elementary School in Xinyi District, began reporting symptoms of vomiting Friday (Oct. 13) night, with students being admitted to emergency rooms the following day, reported UDN. Investigators suspect that a spoiled milk product served on Friday is responsible for the food poisoning.

Samples of milk, yogurt, and other food items served at the school have been taken for testing to determine the precise origin of the foodborne illness.

India – 16 students hospitalised due to suspected food poisoning at BMC-run school

Hindustan Times

16 students of a civic-run school in Mumbai were hospitalized due to suspected food poisoning after eating a midday meal provided by Shantai Mahila Industrial Co-operative Society. The affected students are now in stable condition and the food supply operation has ceased.

D Gangadharan, joint commissioner (education), BMC along with Kankal and other officials, visited the hospital to inspect the students’ well-being. Gangadharan said, “We examined the school premises to assess the situation. A sample of the food supplied at the school and other materials that were used in the kitchen has been sent to the BMC laboratory in G/North for testing, and the analysis report is expected shortly.”

Research – Risk assessment of norovirus and hepatitis A virus in strawberries imported into China

Wiley Online

Abstract

Norovirus (NoV) and hepatitis A virus (HAV) pose a considerable health risk worldwide. In recent years, many cases of virus infection caused by virus-contaminated strawberries have occurred worldwide. This study applied a critical control point system to analyze the main hazards during the production and marketing of strawberries imported into China and explore the key control points in the whole process. To further evaluate the risks in the supply chain, the established quantitative microbial risk assessment (QMRA) was used to determine the probability that residents would be infected with viruses after consuming imported strawberries. It was found that the risk of virus contamination from imported strawberries was low, and the virus contamination mainly results from water resources and personnel. This research helps the regulatory authorities formulate strategies to ensure the long-term microbial safety of imported strawberries. In addition, the methods may prove useful in evaluating the risks of other agricultural produce.

Research – Pathogenic E. coli in the Food Chain across the Arab Countries: A Descriptive Review

MDPI

Abstract

Foodborne bacterial infections caused by pathogens are a widespread problem in the Middle East, leading to significant economic losses and negative impacts on public health. This review aims to offer insights into the recent literature regarding the occurrence of harmful E. coli bacteria in the food supply of Arab countries. Additionally, it aims to summarize existing information on health issues and the state of resistance to antibiotics. The reviewed evidence highlights a lack of a comprehensive understanding of the extent to which harmful E. coli genes are present in the food supply of Arab countries. Efforts to identify the source of harmful E. coli in the Arab world through molecular characterization are limited. The Gulf Cooperation Council (GCC) countries have conducted few surveys specifically targeting harmful E. coli in the food supply. Despite having qualitative data that indicate the presence or absence of harmful E. coli, there is a noticeable absence of quantitative data regarding the actual numbers of harmful E. coli in chicken meat supplies across all Arab countries. While reports about harmful E. coli in animal-derived foods are common, especially in North African Arab countries, the literature emphasized in this review underscores the ongoing challenge that harmful E. coli pose to food safety and public health in Arab countries.

Research – New publication about microbiological hazards in fresh fruits and vegetables

FAO

Fresh fruits and vegetables contaminated with foodborne pathogens (bacteria, viruses, protozoa, helminths, etc.) have resulted in numerous outbreaks of foodborne illness, made headlines and caused trade disruptions around the world. To better understand these hazards, and how to prevent and mitigate the risks, FAO and WHO convened a meeting of scientific experts to identify and evaluate commodity-specific interventions used to reduce the risk of microbiological hazards in fresh fruit and vegetable production – from primary production to post-harvest activities, transportation, point of sale and preparation for consumption. A new report is now available and provides guidance, taking into consideration the effectiveness, practicality and suitability of the various approaches used in fruit and vegetable safety.

Prevention and control of microbiological hazards in fresh fruits and vegetables – Part 4: Specific commodities, which is volume 44 in the FAO/WHO Microbiological Risk Assessment Series, is the report of the meeting convened by the Secretariat of the Joint FAO/WHO Expert Meetings on Microbiological Risk Assessment (JEMRA). It addresses four commodity groups:  leafy vegetables and herbs, berries and tropical fruits, melons and tree fruits, and seeded and root vegetables.

This assessment updates and expands previous JEMRA work on the safety of fruits and vegetables and supports work being conducted by the Codex Alimentarius Commission on the development of guidelines for the control of Shiga toxin-producing Escherichia coli (STEC) in leafy vegetables and in sprouts.

Download the report

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.