Bacterial Subversion Tactics

Intracellular bacterial pathogens such as Listeria monocytogenes can change host cell transcription programs to promote infection. Eskandarian et al. (1238858) found that during infection, the Listeria effector protein InlB promoted … [Read more]
Source: This Week in Science - Category: Science Authors: Source Type: research

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Publication date: January 2020Source: LWT, Volume 117Author(s): A. García, L.M. Pérez, G.N. Piccirilli, R.A. VerdiniAbstractSoy sauce is a traditional seasoning for foods available at the global market that is consumed all over the world. This sauce has a unique flavor and also antimicrobial and antioxidant properties. There is a wide range of soy sauces and their differences are mainly based on the manufacturing methods. Variation in chemical composition is mainly due to differences in fermentation process and the addition of supplementary ingredients like flavor enhancers, among others. The present work, fi...
Source: LWT Food Science and Technology - Category: Food Science Source Type: research
Publication date: Available online 20 September 2019Source: Food ControlAuthor(s): Sophie Tongyu Wu, John Burnett, Jingjin Wang, Susan R. Hammons, Deklin R. Veenhuizen, Haley F. OliverAbstractWe designed and implemented a comprehensive survey of facilities, management practices, and cleaning and sanitizing frequencies in 30 United States grocery retail produce departments to evaluate Listeria monocytogenes control strategies. Produce department managers completed the survey during a six-month longitudinal study of L. monocytogenes on food and non-food contact surfaces in retail produce departments. L. monocytogenes prevale...
Source: Food Control - Category: Food Science Source Type: research
Listeria monocytogenes meningitis in Danish children 1 month to 17 years from 2000 to 2017 was identified and patient files reviewed. There were 5 cases, equaling an annual incidence of 0.024 per 100,000 children or 0.014 when excluding 2 immunodeficient children. Even in a country with a high general incidence of listeriosis, Listeria meningitis is a rare event in healthy children.
Source: The Pediatric Infectious Disease Journal - Category: Infectious Diseases Tags: Brief Reports Source Type: research
In this study, the efficacy of hot water disinfection treatments to eliminate L. monocytogenes from commercial mushroom slicers was examined. Fourteen L. monocytogenes strains, including several obtained from mushrooms or mushroom processing environments, were screened for heat tolerance at 60 oC for 6 min. The 6 most heat tolerant strains were used to prepare a microbial cocktail for thermal inactivation studies. Heat tolerance of planktonic cells was not affected by incubation at 30 °C for up to 7 days, or the extent to which they adhered to stainless-steel coupons under the same conditions. Respective L. monocytogen...
Source: Food Control - Category: Food Science Source Type: research
Publication date: Available online 18 September 2019Source: Food BioscienceAuthor(s): Sarengaowa, Wenzhong Hu, Ke Feng, Zhilong Xiu, Aili Jiang, Ying LaoAbstractFresh-cut cantaloupe (Cucumis melo L.) is a popular food. However, the presence of foodborne pathogen on the cut surfaces leads to both spoilage and food poisoning of fresh-cut cantaloupe. The antibacterial effectiveness of an alginate-based edible coating (EC) containing thyme oil was evaluated against foodborne pathogens on fresh-cut cantaloupe samples. Cantaloupe samples were treated with alginate-based EC and alginate-based EC containing different concentration...
Source: Food Bioscience - Category: Food Science Source Type: research
This study evaluates biocidal effect of Euclea crispa stem bark extract and determines time-kill kinetics of its potent fractions as well as membrane attack capability. Susceptibility of the bacterial cells and minimum inhibitory concentrations (MICs) were determined via agar-well diffusion and broth micro-dilution respectively, time-kill kinetics were evaluated at different concentrations over 2-h period and membrane attack potential was evaluated via scanning electron microscopy imaging and measurement of the amount of proteins and nucleic acids released from the cells. Maximum zone of inhibition (22 ±&thin...
Source: Journal of Herbal Medicine - Category: Complementary Medicine Source Type: research
In response to infection with intracellular microorganisms, old mice mobilize decreased numbers of antigen-specific CD8 T cells with reduced expression of effector molecules and impaired cytolytic activity. Molecular mechanisms behind these defects and the cell-intrinsic (affecting naïve CD8 T cells themselves) vs. extrinsic, microenvironmental origin of such defects remain unclear. Using reciprocal transfer experiments of highly purified naïve T cells from adult and old transgenic OT-1 mice, we decisively show that the dominant effect is cell-extrinsic. Naïve adult OT-1 T cells failed to expand and terminal...
Source: Frontiers in Immunology - Category: Allergy & Immunology Source Type: research
Three people have died and at least 222 have been infected in Spain's largest ever outbreak of listeria, the World Health Organization (WHO) said on Monday.
Source: Reuters: Health - Category: Consumer Health News Tags: healthNews Source Type: news
Conclusion. Subgroups of L. monocytogenes possess different virulence phenotypes that may be associated with niche-specificity. While hypervirulent clones have been identified so far in lineage I, our data demonstrate that hypervirulent clones are not restricted to lineage I, as CC14 belongs to lineage II. Identification of subgroups with a higher ability to cause disease may facilitate surveillance and management of listeriosis. PMID: 31524579 [PubMed - as supplied by publisher]
Source: Journal of Medical Microbiology - Category: Microbiology Authors: Tags: J Med Microbiol Source Type: research
Publication date: December 2019Source: Food Packaging and Shelf Life, Volume 22Author(s): Yeong-Ju Bang, Shiv Shankar, Jong-Whan RhimAbstractSilver nanoparticles (AgNP) were synthesized in situ by reducing AgNO3 using resorcinol and gelatin to prepare functional gelatin/resorcinol/AgNP nanocomposite films (Gel/Res/AgNP). The nanocomposite film exhibited a characteristic light absorption peak of AgNP at 420 nm and improved UV-light barrier property. X-ray diffraction (XRD) results also showed a characteristic reflection peak of crystalline AgNP around 2θ = 38° corresponding to the (111) diffraction plane of ...
Source: Food Packaging and Shelf Life - Category: Food Science Source Type: research
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