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Streptococcus suis

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https://www.readbyqxmd.com/read/28733150/seven-new-lignan-glycosides-from-the-branches-of-alangium-kurzii-craib-var-laxifolium
#1
Jie Ren, Yang-Guo Xie, Ying-Ying Huang, Sheng-Lan Zhu, Shi-Kai Yan, Hui-Zi Jin, Wei-Dong Zhang
Seven new lignan glycosides (1-3, 8-10, and 14) and 17 known compounds were isolated from the branches of Alangium kurzii Craib var. laxifolium. Their structures were established by spectroscopic analysis and circular dichroism (CD) and X-ray analysis. The isolated compounds were evaluated for their antibacterial activities against Staphylococcus aureus CI1011, Streptococcus suis CI1608, Salmonella gallinarum CI0912, Enterococcus faecalis CI1304, Aeromonas hydrophila CI1008, Escherichia coli CI151012, Vibrio parahaemolyticus CI150506, Klebsiella pneumoniae CI131216, Pseudomonas aeruginosa CI1011, Staphylococcus epidermidis CI1110, and Streptococcus agalactiae CI1302...
July 18, 2017: Fitoterapia
https://www.readbyqxmd.com/read/28729683/a-positive-feedback-loop-mediated-by-sigma-x-enhances-expression-of-the-streptococcal-regulator-comr
#2
Rabia Khan, Roger Junges, Heidi A Åmdal, Tsute Chen, Donald A Morrison, Fernanda C Petersen
Natural transformation is used by bacteria to take up DNA from their surroundings and incorporate it into their genomes. Streptococci do so during a transient period of competence, triggered by pheromones that they produce, secrete and sense under conditions influenced by the environment. In Streptococcus mutans, Streptococcus suis, and species of the bovis, salivarius and pyogenic groups of streptococci, the pheromone XIP is sensed by the intra-cellular regulator ComR, that in turn activates the transcription of comS, encoding the XIP precursor, and of sigX, encoding the only known alternative sigma factor in streptococci...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28719258/impact-of-a-food-safety-campaign-on-streptococcus-suis-infection-in-humans-in-thailand
#3
Dan Takeuchi, Anusak Kerdsin, Yukihiro Akeda, Piphat Chiranairadul, Phacharaphan Loetthong, Nutchada Tanburawong, Prasanee Areeratana, Panarat Puangmali, Kasean Khamisara, Wirasinee Pinyo, Rapeepun Anukul, Sutit Samerchea, Punpong Lekhalula, Tatsuya Nakayama, Kouji Yamamoto, Masayo Hirose, Shigeyuki Hamada, Surang Dejsirilert, Kazunori Oishi
AbstractStreptococcus suis is an important zoonotic pathogen in swine and humans that causes sepsis and meningitis. Our previous study in Thailand showed that the prevalence of S. suis infection in humans, especially in northern areas of Thailand, and the transmission of the pathogen occurred mainly through the consumption of traditional raw pork products. Considering the high incidence proportion and mortality rate of the disease as an important public health problem, we implemented a food safety campaign in the Phayao Province in northern Thailand in 2011...
June 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28706510/natural-killer-cell-functions-during-the-innate-immune-response-to-pathogenic-streptococci
#4
Paul Lemire, Tristan Galbas, Jacques Thibodeau, Mariela Segura
Dendritic cells (DCs) and NK cells play a crucial role in the first phase of host defense against infections. Group B Streptococcus (GBS) and Streptococcus suis are encapsulated streptococci causing severe systemic inflammation, leading to septicemia and meningitis. Yet, the involvement of NK cells in the innate immune response to encapsulated bacterial infection is poorly characterized. Here, it was observed that these two streptococcal species rapidly induce the release of IFN-γ and that NK cells are the major cell type responsible for this production during the acute phase of the infection...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28705175/serotype-specific-role-of-antigen-i-ii-in-the-initial-steps-of-the-pathogenesis-of-the-infection-caused-by-streptococcus-suis
#5
Sarah Chuzeville, Jean-Philippe Auger, Audrey Dumesnil, David Roy, Sonia Lacouture, Nahuel Fittipaldi, Daniel Grenier, Marcelo Gottschalk
Streptococcus suis is one of the most important post-weaning porcine bacterial pathogens worldwide. The serotypes 2 and 9 are often considered the most virulent and prevalent serotypes involved in swine infections, especially in Europe. However, knowledge of the bacterial factors involved in the first steps of the pathogenesis of the infection remains scarce. In several pathogenic streptococci, expression of multimodal adhesion proteins known as antigen I/II (AgI/II) have been linked with persistence in the upper respiratory tract and the oral cavity, as well as with bacterial dissemination...
July 14, 2017: Veterinary Research
https://www.readbyqxmd.com/read/28701159/bacterial-bloodstream-infections-in-a-tertiary-infectious-diseases-hospital-in-northern-vietnam-aetiology-drug-resistance-and-treatment-outcome
#6
Vu Quoc Dat, Hieu Ngoc Vu, Hung Nguyen The, Hoa Thi Nguyen, Long Bao Hoang, Dung Vu Tien Viet, Chi Linh Bui, Kinh Van Nguyen, Trung Vu Nguyen, Dao Tuyet Trinh, Alessandro Torre, H Rogier van Doorn, Behzad Nadjm, Heiman F L Wertheim
BACKGROUND: Bloodstream infections (BSIs) are associated with high morbidity and mortality worldwide. However their aetiology, antimicrobial susceptibilities and associated outcomes differ between developed and developing countries. Systematic data from Vietnam are scarce. Here we present aetiologic data on BSI in adults admitted to a large tertiary referral hospital for infectious diseases in Hanoi, Vietnam. METHODS: A retrospective study was conducted at the National Hospital for Tropical Diseases between January 2011 and December 2013...
July 12, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28676041/erratum-to-genome-wide-analysis-of-an-avirulent-strain-that-induces-protective-immunity-against-challenge-with-virulent-streptococcus-suis-serotype-2
#7
Jing Wang, Youjun Feng, Changjun Wang, Feng Zheng, Bachar Hassan, Liming Zhi, Wenjuan Li, Yi Yao, Elaine He, Shibo Jiang, Jiaqi Tang
No abstract text is available yet for this article.
July 4, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28670863/microbiological-zoonotic-emerging-risks-transmitted-between-livestock-animals-and-humans-2007-2015
#8
REVIEW
M E Filippitzi, T Goumperis, T Robinson, C Saegerman
As part of the Emerging Risk Identification (ERI) activities of the European Food Safety Authority (EFSA), a literature search was conducted to identify the microbiological agents transmitted between livestock animals and humans that have been suggested as having emerged between 2007 and 2015 in peer-reviewed scientific literature published during the same period (2007-2015). According to the criteria set, the search identified seven such zoonotic agents, namely West Nile Fever virus, Rift Valley Fever virus, Crimean-Congo Haemorrhagic Fever virus, Influenza A H1N1 virus, Coxiella burnetii, Streptococcus suis and livestock-associated methicillin-resistant Staphylococcus aureus clonal complex 398...
August 2017: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/28670278/rutin-inhibits-streptococcus-suis-biofilm-formation-by-affecting-cps-biosynthesis
#9
Shuai Wang, Chang Wang, Lingfei Gao, Hua Cai, Yonghui Zhou, Yanbei Yang, Changgeng Xu, Wenya Ding, Jianqing Chen, Ishfaq Muhammad, Xueying Chen, Xinmiao He, Di Liu, Yanhua Li
Streptococcus suis (S. suis) form biofilms and causes severe diseases in humans and pigs. Biofilms are communities of microbes embedded in a matrix of extracellular polymeric substances. Eradicating biofilms with the use of antibiotics or biocides is often ineffective and needs replacement with other potential agents. Compared to conventional agents, promising and potential alternatives are biofilm-inhibiting compounds without impairing growth. Here, we screened a S. suis adhesion inhibitor, rutin, derived from Syringa...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28642750/non-pylori-helicobacters-nhphs-induce-shifts-in-gastric-microbiota-in-helicobacter-pylori-infected-patients
#10
Xianhui Peng, Liya Zhou, Yanan Gong, Zhiqiang Song, Lihua He, Sanren Lin, Jianzhong Zhang
To explore the effects of gastric non-H. pylori Helicobacter species(NHPH) on the structure and potential function of gastric microbiota, we employed 16S rRNA gene sequencing on 164 gastric biopsy specimens from NHPH (H. suis, H. felis, H. salomonis) /H. pylori coinfection individuals, H. pylori monoinfection individuals and healthy controls. The results demonstrated that marked structural and functional variations between H. pylori mono- and coinfection samples (HPHS, HPHF, HPHM). The changes in bacterial structure induced by NHPH are mainly attributed to their ability of gastric acid secretion inhibition as well as bacterial chemotaxis...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28642597/a-single-amino-acid-polymorphism-in-the-glycosyltransferase-cpsk-defines-four-streptococcus-suis-serotypes
#11
David Roy, Taryn B T Athey, Jean-Philippe Auger, Guillaume Goyette-Desjardins, Marie-Rose Van Calsteren, Daisuke Takamatsu, Masatoshi Okura, Sarah Teatero, Martín Alcorlo, Juan A Hermoso, Mariela Segura, Marcelo Gottschalk, Nahuel Fittipaldi
The capsular polysaccharide (CPS) is the major virulence factor of the emerging zoonotic pathogen Streptococcus suis. CPS differences are also the basis for serological differentiation of the species into 29 serotypes. Serotypes 2 and 1/2, which possess identical gene content in their cps loci, express CPSs that differ only by substitution of galactose (Gal) by N-acetylgalactosamine (GalNAc) in the CPS side chain. The same sugar substitution differentiates the CPS of serotypes 14 and 1, whose cps loci are also identical in gene content...
June 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28632907/preferential-aerosolization-of-bacteria-in-bioaerosols-generated-in-vitro
#12
P Perrott, N Turgeon, L Gauthier-Levesque, C Duchaine
AIMS: Little is known about how bacteria are aerosolized in terms of whether some bacteria will be found in the air more readily than others that are present in the source. This report describes in vitro experiments to compare aerosolization rates (also known as preferential aerosolization) of Gram-positive and Gram negative bacteria as well as rod and coccus shaped bacteria, using two nebulization conditions. METHODS AND RESULTS: A consortium of five bacterial species was aerosolized in a homemade chamber...
June 20, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28629722/the-manganese-efflux-system-mnte-contributes-to-the-virulence-of-streptococcus-suis-serotype-2
#13
Jiali Xu, Chengkun Zheng, Manman Cao, Ting Zeng, Xigong Zhao, Guolin Shi, Huanchun Chen, Weicheng Bei
Manganese is an essential micronutrient to bacteria and plays an important role in bacterial physiology. However, an excess of manganese is extremely deleterious to the cell. The manganese efflux system is used to control intracellular manganese levels by some bacteria. In this study, we have identified a cation efflux family protein (MntE) that functions as a manganese export system in Streptococcus suis serotype 2. To investigate the role of mntE in S. suis 2, a mntE deletion mutant (ΔmntE) and the corresponding complementation strain (CΔmntE) were constructed...
June 16, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28622857/streptococcus-suis-serotype-9-strain-gz0565-contains-a-type-vii-secretion-system-putative-substrate-esxa-that-contributes-to-bacterial-virulence-and-a-vanz-like-gene-that-confers-resistance-to-teicoplanin-and-dalbavancin-in-streptococcus-agalactiae
#14
Liying Lai, Jiao Dai, Huanyu Tang, Shouming Zhang, Chunyan Wu, Wancen Qiu, Chengping Lu, Huochun Yao, Hongjie Fan, Zongfu Wu
Streptococcus suis (SS), an important pathogen for pigs, is not only considered as a zoonotic agent for humans, but is also recognized as a major reservoir of antimicrobial resistance contributing to the spread of resistance genes to other pathogenic Streptococcus species. In addition to serotype 2 (SS2), serotype 9 (SS9) is another prevalent serotype isolated from diseased pigs. Although many SS strains have been sequenced, the complete genome of a non-SS2 virulent strain has been unavailable to date. Here, we report the complete genome of GZ0565, a virulent strain of SS9, isolated from a pig with meningitis...
June 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28622084/the-streptococcus-suis-factor-h-binding-protein-a-key-to-unlocking-the-blood-brain-barrier-and-access-the-central-nervous-system
#15
Jean-Philippe Auger, Marcelo Gottschalk
No abstract text is available yet for this article.
June 16, 2017: Virulence
https://www.readbyqxmd.com/read/28620262/prevalence-of-multiple-drug-resistant-streptococcus-suis-in-and-around-guwahati-india
#16
Mrinalee Devi, Jyoti B Dutta, Swaraj Rajkhowa, Dhireswar Kalita, Girindra Kumar Saikia, Bipin Chandra Das, Razibuddin Ahmed Hazarika, Gauranga Mahato
AIM: This study was conducted to determine the prevalence and antimicrobial susceptibility of Streptococcus suis and their resistance patterns isolated from both clinically healthy carriers and diseased pigs in and around Guwahati, Assam, India. MATERIALS AND METHODS: A total of 497 samples were collected during October, 2012, to April, 2014, from clinically healthy (n=67) and diseased (n=230) pigs of varying age and either sex maintained under organized and unorganized farming systems...
May 2017: Veterinary World
https://www.readbyqxmd.com/read/28619168/comparison-of-asian-porcine-high-fever-disease-isolates-of-porcine-reproductive-and-respiratory-syndrome-virus-to-united-states-isolates-for-their-ability-to-cause-disease-and-secondary-bacterial-infection-in-swine
#17
Susan L Brockmeier, Crystal L Loving, Mitchel V Palmer, Allyn Spear, Tracy L Nicholson, Kay S Faaberg, Kelly M Lager
Epidemiologic data from Asian outbreaks of highly-pathogenic (HP) porcine reproductive and respiratory syndrome virus (PRRSV) suggest that disease severity was associated with both the virulence of the PRRSV isolates and secondary bacterial infections. Previous reports have indicated that U.S. isolates of PRRSV predispose to secondary bacterial infections as well, but the severity of disease that occurred in Asia in pigs infected with these HP-PRRSV strains has not been reported in the U.S. The objectives of this research were to compare the pathogenesis of Asian and U...
May 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28567041/pathogen-reactive-t-helper-cell-analysis-in-the-pig
#18
Friederike Ebner, Patrycja Schwiertz, Svenja Steinfelder, Robert Pieper, Jürgen Zentek, Nicole Schütze, Christoph G Baums, Gottfried Alber, Peter Geldhof, Susanne Hartmann
There is growing interest in studying host-pathogen interactions in human-relevant large animal models such as the pig. Despite the progress in developing immunological reagents for porcine T cell research, there is an urgent need to directly assess pathogen-specific T cells-an extremely rare population of cells, but of upmost importance in orchestrating the host immune response to a given pathogen. Here, we established that the activation marker CD154 (CD40L), known from human and mouse studies, identifies also porcine antigen-reactive CD4(+) T lymphocytes...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28536561/differences-in-microbiota-membership-along-the-gastrointestinal-tract-of-piglets-and-their-differential-alterations-following-an-early-life-antibiotic-intervention
#19
Chunlong Mu, Yuxiang Yang, Yong Su, Erwin G Zoetendal, Weiyun Zhu
Early-life antibiotic interventions can change the predisposition to disease by disturbing the gut microbiota. However, the impact of antibiotics on gut microbiota in the gastrointestinal tract is not completely understood, although antibiotic-induced alterations in the distal gut have been reported. Here, employing a piglet model, the microbial composition was analyzed by high-throughput 16S rRNA gene sequencing and PICRUSt predictions of metagenome function. The present study showed clear spatial variation of microbial communities in the stomach and intestine, and found that the administration of antibiotics (a mixture of olaquindox, oxytetracycline calcium, kitasamycin) in early life caused markedly differential alterations in the compartmentalized microbiota, with major alterations in their spatial variation in the lumen of the stomach and small intestine...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28516843/potentially-hazardous-streptococcus-suis-strains-latent-in-asymptomatic-pigs-in-a-major-swine-production-area-of-thailand
#20
Nattakan Meekhanon, Sarawan Kaewmongkol, Waraphon Phimpraphai, Masatoshi Okura, Makoto Osaki, Tsutomu Sekizaki, Daisuke Takamatsu
PURPOSE: Carrier pigs have been considered as the major reservoir of Streptococcus suis and couldbe a significant source of human infection. Therefore, we investigated the prevalence and characteristics of latent S. suis in asymptomatic pigs in the pig-farming area of central Thailand, and compared the data to those previously reported in other regions. METHODOLOGY: We collected samples from 340 asymptomatic pigs. S. suis isolates from the samples were confirmed by species-specific PCR (recN PCR)...
May 2017: Journal of Medical Microbiology
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