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biofilm salmonella

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https://www.readbyqxmd.com/read/29317704/biofilm-formation-protects-salmonella-from-the-antibiotic-ciprofloxacin-in-vitro-and-in-vivo-in-the-mouse-model-of-chronic-carriage
#1
Juan F González, Halley Alberts, Joel Lee, Lauren Doolittle, John S Gunn
Typhoid fever is caused by the human-restricted pathogen Salmonella enterica sv. Typhi. Approximately 5% of people that resolve the disease become chronic carriers, with the gallbladder as the main reservoir of the bacteria. Of these, about 90% present with gallstones, on which Salmonella form biofilms. Because S. Typhi is a human-restricted pathogen, these carriers are the main source of dissemination of the disease; unfortunately, antibiotic treatment has shown to be an ineffective therapy. This is believed to be caused by the inherent antibiotic resistance conferred by Salmonella biofilms growing on gallstones...
January 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29315029/correlations-among-resistances-to-different-antimicrobial-compounds-in-salmonella-strains-from-hen-eggshells
#2
Maria Luisa Fernández Márquez, María José Grande Burgos, Rubén Pérez Pulido, Antonio Gálvez, Rosario Lucas López
Persistence of antibiotic-resistant Salmonella in the food chain may depend on strain tolerance to other antimicrobials and also on biofilm formation capacity. Yet, there is limited information on sensitivity of antibiotic-resistant Salmonella to other antimicrobials, such as phenolic compounds, chemical preservatives, or antimicrobial peptides. This study aimed at correlating antimicrobial resistance and biofilm formation capacity in antibiotic-resistant, biocide-tolerant Salmonella strains from hen eggshells...
February 2018: Journal of Food Protection
https://www.readbyqxmd.com/read/29305504/an-igaa-umob-family-protein-from-serratia-marcescens-regulates-motility-capsular-polysaccharide-and-secondary-metabolite-production
#3
Nicholas A Stella, Kimberly M Brothers, Jake D Callaghan, Angelina M Passerini, Cihad Sigindere, Preston J Hill, Xinyu Liu, Daniel J Wozniak, Robert M Q Shanks
Secondary metabolites are an important source of pharmaceuticals and key modulators of microbe-microbe interactions. The bacterium Serratia marcescens is part of the Enterobacteriaceae family of eubacteria and produces a number of biologically active secondary metabolites. In this study, we screened for novel regulators of secondary metabolites synthesized by a clinical isolate of S. marcescens and found mutations in a gene for an uncharacterized UmoB/IgaA family member here named gumB Mutation of gumB conferred a severe loss of secondary metabolites prodigiosin and serratamolide...
January 5, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29291559/spatiotemporal-changes-in-bacterial-community-and-microbial-activity-in-a-full-scale-drinking-water-treatment-plant
#4
Luanfeng Hou, Qin Zhou, Qingping Wu, Qihui Gu, Ming Sun, Jumei Zhang
To gain insight into the bacterial dynamics present in drinking water treatment (DWT) systems, the microbial community and activity in a full-scale DWT plant (DWTP) in Guangzhou, South China, were investigated using Illumina Hiseq sequencing analyses combined with cultivation-based techniques during the wet and dry seasons. Illumina sequencing analysis of 16S rRNA genes revealed a large shift in the proportion of Actinobacteria, Proteobacteria and Firmicutes during the treatment process, with the proportion of Actinobacteria decreased sharply, whereas that of Proteobacteria and Firmicutes increased and predominated in treated water...
December 29, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29280425/characterization-of-invasive-salmonella-serogroup-c1-infections-in-mali
#5
Fabien J Fuche, Sunil Sen, Jennifer A Jones, Joseph Nkeze, Jasnehta Permala-Booth, Milagritos D Tapia, Samba O Sow, Boubou Tamboura, Aliou Touré, Uma Onwuchekwa, Mamadou Sylla, Karen L Kotloff, Sharon M Tennant
Nontyphoidal Salmonella (NTS) are the leading cause of foodborne infections worldwide and a major cause of bloodstream infections in infants and HIV-infected adults in sub-Saharan Africa (SSA). Salmonella Typhimurium (serogroup B) and Salmonella Enteritidis (serogroup D) are the most common serovars in this region. However, data describing rarer invasive NTS serovars, particularly those belonging to serogroups C1 and C2, circulating in SSA are lacking. We previously conducted systematic blood culture surveillance on pediatric patients in Bamako, Mali, from 2002 to 2014, and the results showed that serovars Typhimurium and Enteritidis accounted for 32% and 36% of isolates, respectively...
December 26, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29233257/investigation-using-whole-genome-sequencing-of-a-prolonged-restaurant-outbreak-of-salmonella-typhimurium-linked-to-the-building-drainage-system-england-february-2015-to-march-2016
#6
John Mair-Jenkins, Roberta Borges-Stewart, Caroline Harbour, Judith Cox-Rogers, Tim Dallman, Philip Ashton, Robert Johnston, Deborah Modha, Philip Monk, Richard Puleston
Following notification of a Salmonella enterica serovar Typhimurium gastroenteritis outbreak, we identified 82 cases linked to a restaurant with symptom onset from 12 February 2015 to 8 March 2016. Seventy-two cases had an isolate matching the nationally unique whole genome sequencing profile (single nucleotide polymorphism (SNP) address: 1.1.1.124.395.395). Interviews established exposure to the restaurant and subsequent case-control analysis identified an association with eating carvery buffet food (adjusted odds ratios (AOR): 20...
December 2017: Euro Surveillance: Bulletin Européen sur les Maladies Transmissibles, European Communicable Disease Bulletin
https://www.readbyqxmd.com/read/29227931/synthesis-and-antibacterial-evaluation-of-novel-cationic-chalcone-derivatives-possessing-broad-spectrum-antibacterial-activity
#7
Wen-Chao Chu, Peng-Yan Bai, Zhao-Qing Yang, De-Yun Cui, Yong-Gang Hua, Yi Yang, Qian-Qian Yang, En Zhang, Shangshang Qin
There is an urgent need to identify new antibiotics with novel mechanisms that combat antibiotic resistant bacteria. Herein, a series of chalcone derivatives that mimic the essential properties of cationic antimicrobial peptides were designed and synthesized. Antibacterial activities against drug-sensitive bacteria, including Staphylococcus aureus, Enterococcus faecalis, Escherichia coli and Salmonella enterica, as well as clinical multiple drug resistant isolates of methicillin-resistant S. aureus (MRSA), KPC-2-producing and NDM-1-producing Carbapenem-resistant Enterobacteriaceae were evaluated...
December 5, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29186528/conformational-dynamism-for-dna-interaction-in-the-salmonella-rcsb-response-regulator
#8
Patricia Casino, Laura Miguel-Romero, Juanjo Huesa, Pablo García, Francisco García-Del Portillo, Alberto Marina
The RcsCDB phosphorelay system controls an extremely large regulon in Enterobacteriaceae that involves processes such as biofilm formation, flagella production, synthesis of extracellular capsules and cell division. Therefore, fine-tuning of this system is essential for virulence in pathogenic microorganisms of this group. The final master effector of the RcsCDB system is the response regulator (RR) RcsB, which activates or represses multiple genes by binding to different promoter regions. This regulatory activity of RcsB can be done alone or in combination with additional transcriptional factors in phosphorylated or dephosphorylated states...
November 23, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29186017/effect-of-food-residues-in-biofilm-formation-on-stainless-steel-and-polystyrene-surfaces-by-salmonella-enterica-strains-isolated-from-poultry-houses
#9
Alba María Paz-Méndez, Alexandre Lamas, Beatriz Vázquez, José Manuel Miranda, Alberto Cepeda, Carlos Manuel Franco
Salmonella spp. is a major food-borne pathogen around the world. The ability of Salmonella to produce biofilm is one of the main obstacles in reducing the prevalence of these bacteria in the food chain. Most of Salmonella biofilm studies found in the literature used laboratory growth media. However, in the food chain, food residues are the principal source of nutrients of Salmonella. In this study, the biofilm formation, morphotype, and motility of 13 Salmonella strains belonging to three different subspecies and isolated from poultry houses was evaluated...
November 29, 2017: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/29180375/formation-and-characterization-of-early-bacterial-biofilms-on-different-wood-typologies-applied-in-dairy-production
#10
Margherita Cruciata, Raimondo Gaglio, Maria Luisa Scatassa, Giovanna Sala, Cinzia Cardamone, Marisa Palmeri, Giancarlo Moschetti, Tommaso La Mantia, Luca Settanni
Main hypothesis: Sicilian forestry resources are suitable for the production of equipment to be used in cheese making and indigenous milk lactic acid bacteria (LAB) are able to develop stable biofilms providing starter and non starter cultures necessary for curd fermentation and cheese ripening, respectively. Hence, the present work was carried out to evaluate LAB biofilm formation on different woods derived from trees species grown in Sicily with deproteinized whey. Microbiological and scanning electron microscopy analyses showed minimal differences in microbial levels and composition for the neoformed biofilms...
November 27, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29173625/biofilm-formation-by-salmonella-spp-in-catfish-mucus-extract-under-industrial-conditions
#11
Nitin Dhowlaghar, Piumi De Abrew Abeysundara, Ramakrishna Nannapaneni, Mark W Schilling, Sam Chang, Wen-Hsing Cheng, Chander S Sharma
The objective of this study was to determine the effect of strain and temperature on the growth and biofilm formation of Salmonella spp. in high and low concentrations of catfish mucus extract on different food-contact surfaces at 22 °C and 10 °C. The second objective of this study was to evaluate the efficacy of disinfectants at recommended concentrations and contact times for removing Salmonella biofilms cells on a stainless steel surface containing catfish mucus extract. Growth and biofilm formation of all Salmonella strains increased with higher concentrations of catfish mucus extract at both 10 °C and 22 °C...
April 2018: Food Microbiology
https://www.readbyqxmd.com/read/29163440/nutrient-composition-promotes-switching-between-pellicle-and-bottom-biofilm-in-salmonella
#12
Sonia Paytubi, Cintia Cansado, Cristina Madrid, Carlos Balsalobre
Salmonella is one of the most frequently reported causes of foodborne illness worldwide. Non-typhoidal serovars cause gastroenteritis in humans. Salmonella can grow on surfaces forming biofilms, contributing to its persistence since biofilms are difficult to eradicate due to the high resistance to antimicrobials and disinfectants. It has been described that there are two crucial biofilm promoting factors in Salmonella: curli and cellulose. The expression of both factors is coordinately regulated by the transcriptional regulator CsgD...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29163392/clonal-expansion-of-biofilm-forming-salmonella-typhimurium-st34-with-multidrug-resistance-phenotype-in-the-southern-coastal-region-of-china
#13
Wanli Li, Yinghui Li, Yao Liu, Xiaolu Shi, Min Jiang, Yiman Lin, Yaqun Qiu, Qian Zhang, Qiongcheng Chen, Li Zhou, Qun Sun, Qinghua Hu
To disclose the antibiotics susceptibility and wide adaptability of commonly occurring genotypes of Salmonella Typhimurium, the antibiotic resistance and biofilm formation of different multi-locus sequence typing (MLST) types of a collection of 240 S. Typhimurium isolates (33 food and 207 clinical ones) during 2010-2014 in Shenzhen were analyzed. Among these strains, 167 was ST34 (69.58%), and 57 was ST19 (23.75%), respectively. A total of 159 (95.21%) ST34 strains displayed the multidrug resistant phenotype (≥ three classes of antibiotic), whereas only 23 (40...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29159172/examining-the-link-between-biofilm-formation-and-the-ability-of-pathogenic-salmonella-strains-to-colonize-multiple-host-species
#14
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/29146500/motility-biofilm-formation-apoptotic-effect-and-virulence-gene-expression-of-atypical-salmonella-typhimurium-outside-and-inside-caco-2-cells
#15
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/29128733/prevalence-of-curli-genes-among-cronobacter-species-and-their-roles-in-biofilm-formation-and-cell-cell-aggregation
#16
Lan Hu
Cronobacter species are food-borne opportunistic pathogens that cause sepsis, meningitis, and necrotizing enterocolitis in neonates. Bacterial pathogens such as pathogenic Escherichia coli and Salmonella species express extracellular curli fimbriae that are involved in rugosity, biofilm formation, and host cell adherence. csgBAC operon encodes the major curli structural subunit CsgA and the nucleator protein CsgB. csgDEFG operon encodes the regulatory protein CsgD and putative assembly factors. In this study, the curli operons were analyzed in the sequences of 13 Cronobacter strains and other enteric bacterial pathogens...
October 31, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29125121/structural-basis-of-host-recognition-and-biofilm-formation-by-salmonella-saf-pili
#17
Longhui Zeng, Li Zhang, Pengran Wang, Guoyu Meng
Pili are critical in host recognition, colonization and biofilm formation during bacterial infection. Here, we report the crystal structures of SafD-dsc and SafD-SafA-SafA (SafDAA-dsc) in Saf pili. Cell adherence assays show that SafD and SafA are both required for host recognition, suggesting a poly-adhesive mechanism for Saf pili. Moreover, the SafDAA-dsc structure, as well as SAXS characterization, reveals an unexpected inter-molecular oligomerization, prompting the investigation of Saf-driven self-association in biofilm formation...
November 10, 2017: ELife
https://www.readbyqxmd.com/read/29112725/peptide-transporter-yjiy-influences-the-expression-of-the-virulence-gene-mgtc-to-regulate-biofilm-formation-in-salmonella
#18
Preeti Garai, Kasturi Chandra, Jayanta Chatterjee, Dipshikha Chakravortty
Biofilm is one of the coping strategies of Salmonella against antimicrobial environmental stresses including nutrient starvation. However, channeling of the cue of starvation towards biofilm formation is not understood well. Our study shows that a carbon starvation gene, yjiY, coding for a peptide transporter, influences the expression of a virulence associated gene, mgtC, in Salmonella, to regulate biofilm formation. We demonstrate here that the mutant strain, ΔyjiY, is unable to form biofilm due to the increased expression of mgtC...
November 3, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/29106298/phenotypic-and-molecular-characterization-of-salmonella-enteritidis-se86-isolated-from-poultry-and-salmonellosis-outbreaks
#19
Karen Apellanis Borges, Thales Quedi Furian, Sara Neves de Souza, Rafaela Menezes, Carlos Tadeu Pippi Salle, Hamilton Luiz de Souza Moraes, Eduardo César Tondo, Vladimir Pinheiro do Nascimento
Salmonella Enteritidis remains a standout among the leading causes of foodborne diseases worldwide. Previous studies have demonstrated that a unique clonal group of Salmonella Enteritidis, named SE86, is involved in foodborne outbreaks in southern Brazil and is frequently identified among strains isolated from poultry. The aim of this study was to determine the influence of the isolation source (food products involved in salmonellosis outbreaks and poultry sources) on the phenotypic and molecular characteristics of Salmonella Enteritidis SE86...
November 6, 2017: Foodborne Pathogens and Disease
https://www.readbyqxmd.com/read/29100930/biofilm-formation-by-staphylococcus-aureus-and-salmonella-spp-under-mono-and-dual-species-conditions-and-their-sensitivity-to-cetrimonium-bromide-peracetic-acid-and-sodium-hypochlorite
#20
Maricarmen Iñiguez-Moreno, Melesio Gutiérrez-Lomelí, Pedro Javier Guerrero-Medina, María Guadalupe Avila-Novoa
The aim of this study was evaluated the biofilm formation by Staphylococcus aureus 4E and Salmonella spp. under mono and dual-species biofilms, onto stainless steel 316 (SS) and polypropylene B (PP), and their sensitivity to cetrimonium bromide, peracetic acid and sodium hypochlorite. The biofilms were developed by immersion of the surfaces in TSB by 10 d at 37°C. The results showed that in monospecies biofilms the type of surface not affected the cellular density (p>0.05). However, in dual-species biofilms on PP the adhesion of Salmonella spp...
October 13, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
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