The November 2020 edition of the Fresh Produce Safety Centre Australia & New Zealand newsletter has just been released!
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The Center for Produce Safety in the US has prepared key learnings summaries of its Annual Research Symposium, with five sessions held over June and July 2020.
The full set of Key Learnings from the CPS Research Symposium is here. The following text is drawn from the CPS Key Learnings:
During Session 1 held on June 23, 2020, the Symposium explored the use of computer-based modelling to help address two burning issues for the produce industry: understanding potential Listeria growth and persistence in whole produce commodities and the development of sampling strategies to support the validity of assumptions surrounding microbial testing needs and design of acceptable protocols (Key Learnings Session I).
In Session 2, the Symposium expanded the knowledge base on Listeria monocytogenes and its persistence and growth on specific commodities and fresh-cut products and examined novel methods to control Listeria growth on food contact surfaces (Key Learnings Session II).
In Session 3, the Research Symposium explored projects that took wholistic, systems approaches to solving challenges with pest intrusion into leafy greens fields, pathogen transference on co-managed farms and the impact of traits associated with concepts of soil health on pathogen persistence. It also examined Cyclospora presence in the irrigation canal systems in the Yuma, AZ production region (Key Learnings Session III).
Session 4 featured the use of genomics and metagenomics to address challenges in identifying new or revisited indicators and index testing-targets of human viral pathogens that may ultimately be used in the produce industry, the distribution and relatedness of Listeria species in the U.S., and the use of that information to better understand source-risk related to facilities and product, identification of competitors of Listeria monocytogenes that might control that organism in composts, and build our knowledge base of bacterial pathogen persistence and rates of genetic diversification in the Yuma and Salinas vegetable production regions (Key Learnings Session IV).
Session 5 featured research describing the “die-off” rates of human pathogens in agricultural water from three locations around the world, the persistence of pathogens in shade-house production environments, pathogen persistence in wash water systems and the potential role
of damaged cells to contaminate washed products, the efficacy of irrigation water sanitation and the potential role of sediments in canal systems as reservoirs of human pathogens (Key Learnings Session V).
Deakin University: Australia’s food safety systems will be strengthened by the delivery of a new national implementation program to help track and trace food products from farm to fork in domestic and export markets.
The industry-led program, co-designed by Deakin University’s Centre for Supply Chain and Logistics (CSCL), includes an Australian-first Implementing Food Traceability Guide, plus product specific guides and industry demonstrations that will enable greater visibility along the entire food supply chain. More here.
Sixteen projects will share $4 million in funding under round 1 of the Traceability Grants Program.
Agriculture Minister David Littleproud says the projects are sharing in the funding under the first round of the Australian Government’s $7 million Traceability Grants Program.
One of the projects involves the trial of technology to trace fresh produce through export supply chains, with the melon industry used as a pilot.
A paper has been published on “Environmental Drivers for Persistence of Escherichia coli and Salmonella in Manure-Amended Soils: A Meta-Analysis” by Dao Tran and colleagues at the ARC Training Centre for Food Safety in the Fresh Produce Industry.
The paper, which appeared in the Journal of Food Protection in July, examines 42 primary research studies on pathogen persistence from manure-amended soils, and concludes that “Based on the significant variation observed among individual field studies, it is unlikely the risks associated with the use of manure amendments containing high levels of enteric bacterial pathogens (such as in raw manure) in soils may be solely managed by a uniform exclusion period. Management of the risks associated with the use of soils amended with raw manures is best achieved through risk-based approaches incorporating differences in climate, soil management, and initial levels of bacteria during application.”
While it is recommended that only certified composted organic amendments are used in the production of fresh produce, the message is clear: risk-based approaches taking into account local environmental factors must be used by growers for determining appropriate exclusion periods after using untreated manures. More here.
Fresh Plaza: The consumption of raspberries, blackberries, and blueberries has increased worldwide in recent years because these fruits are considered an important source of antioxidant compounds. Unfortunately, consumption of berries is associated with a risk of foodborne parasites, such as Cyclospora cayetanensis.
In the USA and Canada, many cyclosporiasis cases have been linked to consumption of berries, while at the farm level, the presence of this human pathogen in berries is directly associated with the presence of the parasite in soil. For these reasons, it is fundamental that producers monitor the presence of this pathogen on farms and packing facilities.
Conventionally, detection of C. cayetanensis in clinical and environmental samples is based on identification of oocysts by microscopy, following modified acid fast staining or by UV-light autofluorescence under ultraviolet, this technique is time-consuming, non-specific, and lacks sensitivity. To overcome these issues, food producing industry requires a molecular method able to detect a low oocyst concentration (40–1500 oocyst per gram) as found in food and environmental samples. More.