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https://www.readbyqxmd.com/read/29229736/comparison-of-salmonella-enterica-serovars-typhi-and-typhimurium-reveals-typhoidal-specific-responses-to-bile
#1
Rebecca Johnson, Matt Ravenhall, Derek Pickard, Gordon Dougan, Alexander Byrne, Gad Frankel
Salmonella enterica serovars Typhi and Typhimurium cause typhoid fever and gastroenteritis respectively. A unique feature of typhoid infection is asymptomatic carriage within the gallbladder, which is linked with S Typhi transmission. Despite this, S Typhi responses to bile have been poorly studied. RNA-Seq of S Typhi Ty2 and a clinical S Typhi isolate belonging to the globally dominant H58 lineage (129-0238), as well as S Typhimurium 14028, revealed that 249, 389 and 453 genes respectively were differentially expressed in the presence of 3% bile compared to control cultures lacking bile...
December 11, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/29227543/edible-coating-using-a-chitosan-based-colloid-incorporating-grapefruit-seed-extract-for-cherry-tomato-safety-and-preservation
#2
Jin Sung Won, Seung Jo Lee, Hyeon Hwa Park, Kyung Bin Song, Sea C Min
Grapefruit seed extract (GSE)-containing chitosan-based coating was developed and applied to cherry tomatoes to protect them from Salmonella invasion and improve their storability. The coating colloids were produced by mixing a chitosan colloid (1% [w/w] chitosan) with GSE at various concentrations (0.5%, 0.7%, 1.0%, and 1.2% [w/w]) using high-shear mixing (10000 rpm, 2 min). Coatings with chitosan colloids containing GSE at 0.0%, 0.5%, 0.7%, and 1.0% (w/w) inactivated Salmonella on cherry tomatoes by 1.0 ± 0...
December 11, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/29218781/in-vitro-invasion-capacity-of-salmonella-typhimurium-dt9-isolates-sourced-from-humans-and-layer-hen-environments
#3
A R McWhorter, G Phan, H Hocking, K K Chousalkar
In Australia, Salmonella Typhimurium definitive type 9 is frequently isolated during foodborne outbreaks of salmonellosis. Multiple-locus variable number tandem repeat analysis (MLVA) trace back investigations frequently identify isolate distribution patterns that may be epidemiologically linked to disease outbreaks. In this study, the in vitro virulence potential of S. Typhimurium DT9 isolates possessing different MLVA patterns (03 15 07 11 550, 03 24 11 10 523, 03 15 08 11 550 and 03 14 08 11 550) isolated from either humans or layer hens was assessed using a human colon carcinoma cell line...
December 8, 2017: Zoonoses and Public Health
https://www.readbyqxmd.com/read/29217765/zoonotic-potential-of-salmonella-enterica-carried-by-pet-tortoises
#4
Hayley L Bruce, Paul A Barrow, Andrew N Rycroft
The prevalence of Salmonella in chelonians is not known in the UK and it is not clear whether such Salmonella strains would be pathogenic for human beings. Some strains, such as members of the Arizonae subgroup, may be unable to cause anything more than very mild disease. To determine the carriage of Salmonella in pet tortoises, cloacal swabs were taken for culture. Salmonella enterica Group D was isolated from 5 of the 89 samples. All five were from the same household of seven tortoises. Salmonella isolates were shown by PCR to carry the invA and spiC genes associated with pathogenicity islands 1 and 2...
December 7, 2017: Veterinary Record
https://www.readbyqxmd.com/read/29216183/presentation-of-life-threatening-invasive-nontyphoidal-salmonella-disease-in-malawian-children-a-prospective-observational-study
#5
Calman A MacLennan, Chisomo L Msefula, Esther N Gondwe, James J Gilchrist, Paul Pensulo, Wilson L Mandala, Grace Mwimaniwa, Meraby Banda, Julia Kenny, Lorna K Wilson, Amos Phiri, Jenny M MacLennan, Elizabeth M Molyneux, Malcolm E Molyneux, Stephen M Graham
Nontyphoidal Salmonellae commonly cause invasive disease in African children that is often fatal. The clinical diagnosis of these infections is hampered by the absence of a clear clinical syndrome. Drug resistance means that empirical antibiotic therapy is often ineffective and currently no vaccine is available. The study objective was to identify risk factors for mortality among children presenting to hospital with invasive Salmonella disease in Africa. We conducted a prospective study enrolling consecutive children with microbiologically-confirmed invasive Salmonella disease admitted to Queen Elizabeth Central Hospital, Blantyre, in 2006...
December 7, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29214087/invasive-nontyphoidal-salmonella-infection-in-a-patient-with-early-stage-chronic-lymphocytic-leukemia
#6
Deepika Slawek, Yanina Dubrovskaya, Eddie Louie
We describe a case of a 72-year-old man with early-stage chronic lymphocytic leukemia (CLL) who presented with invasive nontyphoidal Salmonella (iNTS) infection, necrotizing pneumonia, and chronic infection of a hilar lymph node. Infection is a major cause of death in patients with CLL. Though few cases of iNTS infection associated with CLL have been described in the literature, to our knowledge this is the first reported case of iNTS-associated necrotizing pneumonia. Immunocompromised state in patients, even with early-stage CLL, likely predisposes them to invasive infection with intracellular organisms, such as Salmonella spp...
2017: Case Reports in Infectious Diseases
https://www.readbyqxmd.com/read/29208746/controlled-activity-of-the-salmonella-invasion-associated-injectisome-reveals-its-intracellular-role-in-the-cytosolic-population
#7
Jessica A Klein, Jesse R Grenz, James M Slauch, Leigh A Knodler
The Salmonella invasion-associated type III secretion system (T3SS1) is an essential virulence factor required for entry into nonphagocytic cells and consequent uptake into a Salmonella-containing vacuole (SCV). While Salmonella is typically regarded as a vacuolar pathogen, a subset of bacteria escape from the SCV in epithelial cells and eventually hyperreplicate in the cytosol. T3SS1 is downregulated following bacterial entry into mammalian cells, but cytosolic Salmonella cells are T3SS1 induced, suggesting prolonged or resurgent activity of T3SS1 in this population...
December 5, 2017: MBio
https://www.readbyqxmd.com/read/29202825/antibacterial-activity-and-effects-of-colla-corii-asini-on-salmonella-typhimurium-invasion-in-vitro-and-in-vivo
#8
Kwang-Il Park, Mi-Ra Lee, Tae-Woo Oh, Kwang-Youn Kim, Jin-Yeul Ma
BACKGROUND: Salmonella enterica serovar Typhimurium is a foodborne pathogen that triggers inflammatory responses in the intestines of humans and livestock. Colla corii asini is a traditional medicine used to treat gynecologic and chronic diseases in Korea and China. However, the antibacterial activity of Colla corii asini has been unknown. In this study, we investigated the antibacterial activity and effects of Colla corii asini extract on Salmonella typhimurium invasion. METHODS: To tested for antibacterial effects of Colla corii asini extracts, we confirmed the agar diffusion using Luria solid broth medium...
December 4, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/29195496/-does-the-salmonella-genomic-island-1-sgi1-confer-invasiveness-properties-to-human-isolates
#9
Claire de Curraize, Lucie Amoureux, Julien Bador, Angélique Chapuis, Eliane Siebor, Claire Clément, Juliette Sauge, Ludwig-Serge Aho-Glélé, Catherine Neuwirth
BACKGROUND: In the eighties, a multidrug resistant clone of Salmonella Typhimurium DT104 emerged in UK and disseminated worldwide. This clone harbored a Salmonella genomic island 1 (SGI1) that consists of a backbone and a multidrug resistant region encoding for penta-resistance (ampicillin, chloramphenicol/florfenicol, streptomycin/spectinomycin, sulphonamides and tetracycline (ACSSuT)). Several authors suggested that SGI1 might have a potential role in enhancement of virulence properties of Salmonella enterica...
December 1, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29187844/speg-is-required-for-intracellular-replication-of-salmonella-in-various-human-cells-and-affects-its-polyamine-metabolism-and-global-transcriptomes
#10
Shiuh-Bin Fang, Ching-Jou Huang, Chih-Hung Huang, Ke-Chuan Wang, Nai-Wen Chang, Hung-Yin Pan, Hsu-Wei Fang, Ming-Te Huang, Ching-Kuo Chen
The speG gene has been reported to regulate polyamine metabolism in Escherichia coli and Shigella, but its role in Salmonella remains unknown. Our preliminary studies have revealed that speG widely affects the transcriptomes of infected in vitro M and Caco-2 cells and that it is required for the intracellular replication of Salmonella enterica serovar Typhimurium (S. Typhimurium) in HeLa cells. In this study, we demonstrated that speG plays a time-dependent and cell type-independent role in the intracellular replication of S...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29181956/infectious-diseases-in-poland-in-2015
#11
Małgorzata Sadkowska-Todys, Andrzej Zieliński, Mirosław P. Czarkowski
PURPOSE OF THE STUDY: This is the next annual analysis of the situation of infectious and parasitic diseases in Poland in 2015 within the framework of the Epidemiological Chronicle of Przegląd Epidemiologiczny - Epidemiological Review. Its purpose is to identify potential threats to the health of populations from infectious diseases occurring in Poland with reference to other parts of the globe. MATERIAL AND METHODS: This paper is an introduction to more detailed studies of the epidemiological situation of selected infectious diseases and summarizes the results of the surveillance of infectious diseases in Poland in 2015...
2017: Przegla̧d Epidemiologiczny
https://www.readbyqxmd.com/read/29180525/increasing-antimicrobial-resistance-in-non-typhoidal-salmonella-in-australia-1979-2015
#12
Deborah A Williamson, Courtney R Lane, Marion Easton, Mary Valcanis, Janet Strachan, Mark G Veitch, Martyn D Kirk, Benjamin P Howden
Australia has high and increasing rates of salmonellosis. To date, the serovar distribution and associated antimicrobial resistance (AMR) patterns of non-typhoidal Salmonella enterica (NTS) in Australia have not been assessed. Such information provides critical knowledge about AMR in the food chain, and informs decisions about public health. We reviewed longitudinal data on NTS in two Australian states over a thirty-seven-year period, between 1979 and 2015, and antimicrobial resistance since 1984. Overall, 17% of isolates were non-susceptible to at least one antimicrobial, 4...
November 27, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29180411/correction-for-alvarez-et-al-human-genetic-variation-in-vac14-regulates-salmonella-invasion-and-typhoid-fever-through-modulation-of-cholesterol
#13
(no author information available yet)
No abstract text is available yet for this article.
November 27, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29180409/correction-to-supporting-information-for-alvarez-et-al-human-genetic-variation-in-vac14-regulates-salmonella-invasion-and-typhoid-fever-through-modulation-of-cholesterol
#14
(no author information available yet)
No abstract text is available yet for this article.
November 27, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29165513/-a-five-year-experience-with-zoonotic-salmonella-at-a-pediatric-reference-centre
#15
Patricia Barrios, Federica Badía, Valentina Misa, M Inés Mota, Arací Martínez, Hebert Mariño, Gabriela Algorta, Javier Prego, M Catalina Pírez
BACKGROUND: Salmonella can cause asymptomatic infections, diarrhea, bacteremia and focal infections such as meningitis and osteomyelitis. AIM: To describe clinical and microbiological aspects of infections by Salmonella spp. in children in a pediatric referral hospital: Centro Hospitalario Pereira Rossell, in Montevideo, Uruguay. MATERIALS AND METHODS: Descriptive and retrospective study of 46 patients, from which Salmonella spp was isolated between January 1, 2005 and December 31, 2010...
August 2017: Revista Chilena de Infectología: órgano Oficial de la Sociedad Chilena de Infectología
https://www.readbyqxmd.com/read/29159172/examining-the-link-between-biofilm-formation-and-the-ability-of-pathogenic-salmonella-strains-to-colonize-multiple-host-species
#16
REVIEW
Keith D MacKenzie, Melissa B Palmer, Wolfgang L Köster, Aaron P White
Salmonella are important pathogens worldwide and a predominant number of human infections are zoonotic in nature. The ability of strains to form biofilms, which is a multicellular behavior characterized by the aggregation of cells, is predicted to be a conserved strategy for increased persistence and survival. It may also contribute to the increasing number of infections caused by ingestion of contaminated fruits and vegetables. There is a correlation between biofilm formation and the ability of strains to colonize and replicate within the intestines of multiple host species...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/29155747/isolation-of-salmonella-typhimurium-containing-phagosomes-from-macrophages
#17
Saray Gutiérrez, Martina Wolke, Georg Plum, Nirmal Robinson
Salmonella typhimurium is a facultative intracellular bacterium that causes gastroenteritis in humans. After invasion of the lamina propria, S. typhimurium bacteria are quickly detected and phagocytized by macrophages, and contained in vesicles known as phagosomes in order to be degraded. Isolation of S. typhimurium-containing phagosomes have been widely used to study how S. typhimurium infection alters the process of phagosome maturation to prevent bacterial degradation. Classically, the isolation of bacteria-containing phagosomes has been performed by sucrose gradient centrifugation...
October 25, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29149266/association-between-prior-antibiotic-therapy-and-subsequent-risk-of-community-acquired-infections-a-systematic-review
#18
Umer Malik, David Armstrong, Mark Ashworth, Alex Dregan, Veline L'Esperance, Lucy McDonnell, Mariam Molokhia, Patrick White
Background: Antibiotic use can have negative unintended consequences including disruption of the human microbiota, which is thought to protect against pathogen overgrowth. We conducted a systematic review to assess whether there is an association between exposure to antibiotics and subsequent risk of community-acquired infections. Methods: We searched MEDLINE, EMBASE and Web of Science for studies published before 30 June 2017, examining the association between antibiotic use and subsequent community-acquired infection...
November 14, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29146500/motility-biofilm-formation-apoptotic-effect-and-virulence-gene-expression-of-atypical-salmonella-typhimurium-outside-and-inside-caco-2-cells
#19
Ibtissem Chakroun, Abdelkarim Mahdhi, Patricia Morcillo, Hector Cordero, Alberto Cuesta, Amina Bakhrouf, Kacem Mahdouani, M Ángeles Esteban
Disease outbreaks related to waterborne pathogen contamination throughout the world as well as challenges that lie ahead for addressing persistent infection are of renewed interest. In this research, we studied the effects of prolonged exposure of Salmonella enterica serovar Typhimurium to the cues encountered in the extracellular environment particularly in seawater microcosm on bacterial virulence and subsequent infection in Caco-2 cells. Our data show a significant difference in biofilm formation, swimming and swarming motilities between normal and stressed cells of S...
November 13, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29130383/identification-of-a-novel-gene-in-rod9-island-of-salmonella-enteritidis-involved-in-the-alteration-of-virulence-associated-genes-expression
#20
Susmita Das, Shilpa Ray, Daniel Ryan, Bikash Sahu, Mrutyunjay Suar
Salmonella enterica subsp. I serovar Enteritidis (S. Enteritidis), one of the causative agents for non-typhoidal gastrointestinal diseases in humans is an intracellular bacterium and mechanism for its invasion into host cells is critical to cause infection. The virulence of the pathogen is explained by the expression of genes located on its pathogenicity islands, mostly encoded under SPI-1 and SPI-2. However, S. Typhimurium SL1344, despite sharing ∼98% of its genome with S. Enteritidis P125109, lacks few regions of differences (ROD) that are hypothesized to impart virulence potential to S...
November 13, 2017: Virulence
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