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Streptococcus suis

Xiao-Pei Yang, Ji-Yang Fu, Rui-Cheng Yang, Wen-Tong Liu, Tao Zhang, Bo Yang, Ling Miao, Bei-Bei Dou, Chen Tan, Huan-Chun Chen, Xiang-Ru Wang
BACKGROUND: Streptococcus suis serotype 2 (SS2) is an important zoonotic bacterial pathogen in both humans and animals, which can cause high morbidity and mortality. Meningitis is one of the major clinical manifestations of SS2 infection. However, the specific process of SS2 meningitis and its molecular mechanisms remain unclear. Epidermal growth factor receptor (EGFR) has been reported to initiate transduction of intracellular signals and regulate host inflammatory responses. Whether and how EGFR contributes to the development of S...
October 19, 2016: Journal of Neuroinflammation
Christian Spoerry, Pontus Hessle, Melanie J Lewis, Lois Paton, Jenny M Woof, Ulrich von Pawel-Rammingen
Recently we have discovered an IgG degrading enzyme of the endemic pig pathogen S. suis designated IgdE that is highly specific for porcine IgG. This protease is the founding member of a novel cysteine protease family assigned C113 in the MEROPS peptidase database. Bioinformatical analyses revealed putative members of the IgdE protease family in eight other Streptococcus species. The genes of the putative IgdE family proteases of S. agalactiae, S. porcinus, S. pseudoporcinus and S. equi subsp. zooepidemicus were cloned for production of recombinant protein into expression vectors...
2016: PloS One
Maren Seitz, Peter Valentin-Weigand, Jörg Willenborg
Use of antimicrobial agents in veterinary medicine is essential to control infectious diseases, thereby keeping animals healthy and animal products safe for the consumer. On the other hand, development and spread of antimicrobial resistance is of major concern for public health. Streptococcus (S.) suis reflects a typical bacterial pathogen in modern swine production due to its facultative pathogenic nature and wide spread in the pig population. Thus, in the present review we focus on certain current aspects and problems related to antimicrobial use and resistance in S...
October 15, 2016: Current Topics in Microbiology and Immunology
Per Wallgren, Erik Nörregård, Benedicta Molander, Maria Persson, Carl-Johan Ehlorsson
BACKGROUND: Respiratory illness is traditionally regarded as the disease of the growing pig, and has historically mainly been associated to bacterial infections with focus on Mycoplasma hyopneumoniae and Actinobacillus pleuropneumoniae. These bacteria still are of great importance, but continuously increasing herd sizes have complicated the scenario and the influence of secondary invaders may have been increased. The aim of this study was to evaluate the presence of A. pleuropneumoniae and M...
October 4, 2016: Acta Veterinaria Scandinavica
F Cardoso-Toset, I Luque, A Morales-Partera, A Galán-Relaño, B Barrero-Domínguez, M Hernández, J Gómez-Laguna
Dry-cured hams, shoulders and loins of Iberian pigs are highly appreciated in national and international markets. Salting, additive addition and dehydration are the main strategies to produce these ready-to-eat products. Although the dry curing process is known to reduce the load of well-known food borne pathogens, studies evaluating the viability of other microorganisms in contaminated pork have not been performed. In this work, the efficacy of the dry curing process to eliminate three swine pathogens associated with pork carcass condemnation, Streptococcus suis, Streptococcus dysgalactiae and Trueperella pyogenes, was evaluated...
February 2017: Food Microbiology
Xiaotong Qiu, Xuemei Bai, Ruiting Lan, Han Zheng, Jianguo Xu
: Streptococcus suis is an important pathogen of pigs and may cause serious disease in humans. Serotyping is an important tool in diagnosis and epidemiological studies of S. suis. Thirty-three reference serotypes and 9 novel cps loci (NCL) are recognized in S. suis To gain a better understanding of the prevalence and genetic characteristics of NCLs, we investigated the serotype identity of 486 isolates isolated between 2013 and 2015 in China by capsular gene typing methods. Two hundred and seventy six isolates carried NCL belonging to 16 groups, 8 of which were first reported in this study...
September 30, 2016: Applied and Environmental Microbiology
Yang Zhou, Xingxing Dong, Zhiwei Li, Geng Zou, Li Lin, Xiaohong Wang, Huanchun Chen, Robin B Gasser, Jinquan Li
No abstract text is available yet for this article.
September 30, 2016: Virulence
Daisuke Taniyama, Mayu Sakurai, Tetsuya Sakai, Takahide Kikuchi, Takashi Takahashi
Streptococcus suis is a zoonotic pathogen that can be transferred from pigs to humans. The serotypes 2 and 14 are prevalent among patients with S. suis infections, while other serotypes (i.e., 1, 4, 5, 16, and 24) have been detected in rare human cases. To the best of our knowledge, the present patient handling with raw pork is the first human case of uncomplicated bacteremia due to S. suis serotype 5 in Japan. We confirmed the new sequence type 752 of this isolate. Virulence-associated gene profiling was performed; both sly (encoding the hemolysin suilysin) and mrp (encoding a muramidase-released protein) were detected without amplification of epf (encoding the extracellular factor)...
2016: IDCases
Hongtao Liu, Seng Zhu, Yingying Sun, Na Li, Jingmin Gu, Changjiang Sun, Xin Feng, Wenyu Han, Jian Xia Jiang, Liancheng Lei
Meningitis caused by Streptococcus suis type 2 (S. suis 2) is a great threat to the pig industry and human health. Virulence factors associated with the pathogenesis of meningitis have yet to be clearly defined, even though many potential S. suis 2 virulence factors have been identified. This greatly hinders the progress of S. suis 2 meningitis pathogenesis research. In this study, a co-culture blood brain barrier (BBB) model was established using primary porcine brain microvascular endothelial cells and astrocytes, and the whole genome library of S...
September 23, 2016: Journal of Microbiology and Biotechnology
Jean-Philippe Auger, Nattakan Meekhanon, Masatoshi Okura, Makoto Osaki, Marcelo Gottschalk, Tsutomu Sekizaki, Daisuke Takamatsu
Many Streptococcus suis isolates from porcine endocarditis in slaughterhouses have lost their capsule and are considered avirulent. However, we retrieved capsule- and virulence-recovered S. suis after in vivo passages of a nonencapsulated strain in mice, suggesting that nonencapsulated S. suis are still potentially hazardous for persons in the swine industry.
October 2016: Emerging Infectious Diseases
Shaolong Chen, Wenlong Xie, Kai Wu, Ping Li, Zhiqiang Ren, Lin Li, Yuan Yuan, Chunmao Zhang, Yuling Zheng, Qingyu Lv, Hua Jiang, Yongqiang Jiang
Most of the deaths that occurred during two large outbreaks of Streptococcus suis infections in 1998 and 2005 in China were caused by streptococcal toxic shock syndrome (STSS), which is characterized by increased vascular permeability. Heparin-binding protein (HBP) is thought to mediate the vascular leakage. The purpose of this study was to investigate the detailed mechanism underlying the release of HBP and the vascular leakage induced by S. suis. Significantly higher serum levels of HBP were detected in Chinese patients with STSS than in patients with meningitis or healthy controls...
2016: Frontiers in Microbiology
Xuehan Zhang, Meng Li, Bicheng Zhang, Kangming Chen, Kongwang He
Enterohemorrhagic Escherichia coli (EHEC) O157:H7 is a zoonotic pathogen of worldwide importance that causes foodborne infections in humans. Intimin gamma 1 (intimin γ1) is one of the most important outer membrane proteins required for EHEC's intimate adhesion to epithelial cells. Here, we generated a polyclonal antibody (pAb) and a monoclonal antibody (mAb) against intimin γ1 to develop a double antibody sandwich ELISA (DAS-ELISA) with increased sensitivity and specificity for measuring EHEC O157:H7. To achieve this goal, a rabbit pAb was used as a capture antibody, and a mouse mAb was a detection antibody...
2016: PloS One
Yeotaek Cheong, Changin Oh, Kunkyu Lee, Ki-Hyun Cho
Oral fluid analysis for monitoring herd is an interest in commercial pig farms in Korea. The aim of this study was to investigate the positive rates and correlation of eight pathogens associated with porcine respiratory disease complex (PRDC) by analyzing oral fluid samples from 214 pig groups from 56 commercial farms. The samples collected by rope-chewing method were analyzed with reverse-transcription polymerase chain reaction (RT-PCR) or standard PCR depending on microorganisms. The pathogens were divided into virus group and bacteria group...
September 1, 2016: Journal of Veterinary Science
Fabiola Mancini, Francesco Adamo, Roberta Creti, Monica Monaco, Giovanna Alfarone, Annalisa Pantosti, Alessandra Ciervo
We report the first human fatal case of streptococcal toxic shock syndrome (STSS) caused by Streptococcus suis serotype 2 carrying the tetracycline efflux tet (40) gene and the tetracycline ribosomal protection tet (O/W/32/O) gene. The patient was splenectomized. The case was characterized by multi-organ dysfunction and disseminated intravascular coagulopathy, in accordance with the clinical parameters of STSS. More investigations are needed to improve the epidemiology and the pathogenesis of S. suis in human infection...
August 20, 2016: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
Wentao Yuan, Yaning Zhang, Guangcao Wang, Juan Bai, Xianwei Wang, Yufeng Li, Ping Jiang
A bacteriophage infecting pathogenic Erysipelothrix rhusiopathiae was isolated from a swine farm experiencing an outbreak of acute swine erysipelas; we designated this phage SE-I. SE-I has an icosahedral head, a long tail and a double-stranded DNA genome. The 34,997-bp genome has a GC content of 34 % and contains 43 open reading frames (ORFs) encoding packaging, structural, lysin-holin, and hypothetical proteins. Components of purified SE-I were separated using SDS-PAGE and analyzed using liquid chromatography-mass spectrometry...
November 2016: Archives of Virology
Mariela Segura, Cynthia Calzas, Daniel Grenier, Marcelo Gottschalk
Interactions between a bacterial pathogen and its potentially susceptible host are initiated with the colonization step. During respiratory/oral infection, the pathogens must compete with the normal microflora, resist defense mechanisms of the local mucosal immunity, and finally reach, adhere, and breach the mucosal epithelial cell barrier in order to induce invasive disease. This is the case during infection by the swine and zoonotic pathogen Streptococcus suis, which is able to counteract mucosal barriers to induce severe meningitis and sepsis in swine and in humans...
August 19, 2016: FEBS Letters
Kaisong Huang, Yajing Song, Qiang Zhang, Anding Zhang, Meilin Jin
This study identified a novel integrative and conjugative element (ICESsD9) carrying erm(B) and tet(O) resistance determinants in Streptococcus suis D9 and determined its prevalence in clinical isolates. Comparative genome analysis was performed using Mauve and Artemis Comparison Tool visualisation programs. Inverse PCR was utilised to detect its circular intermediate. The transfer capacity of ICESsD9 was evaluated by mating assays using S. suis A7 and Enterococcus faecalis JH2-2 as recipients. A genome walking approach was employed to analyse the characteristics of integration sites in transconjugants...
July 28, 2016: Journal of Global Antimicrobial Resistance
Jiawen Zhu, Tengfei Zhang, Zhipeng Su, Lu Li, Dong Wang, Ran Xiao, Muye Teng, Meifang Tan, Rui Zhou
(p)ppGpp-mediated stringent response is one of the main adaption mechanism in bacteria, and the ability to adapt to environment is linked to the pathogenesis of bacterial pathogens. In the zoonotic pathogen Streptococcus suis, there are two (p)ppGpp synthetases, RelA and RelQ. To investigate the regulatory functions of (p)ppGpp/(p)ppGpp synthetases on the pathogenesis of S. suis, the phenotypes of the [(p)ppGpp(0)] mutant ΔrelAΔrelQ and its parental strain were compared. Light and electron microscopy observation showed that the mutant strain had a longer chain-length than its parental strain...
October 2016: Microbiological Research
J Kamiie, G Sugahara, S Yoshimoto, N Aihara, T Mineshige, K Uetsuka, K Shirota
Here we report a pig with amyloid A (AA) amyloidosis associated with Streptococcus suis infection and identification of a unique amyloid sequence in the amyloid deposits in the tissue. Tissues from the 180-day-old underdeveloped pig contained foci of necrosis and suppurative inflammation associated with S. suis infection. Congo red stain, immunohistochemistry, and electron microscopy revealed intense AA deposition in the spleen and renal glomeruli. Mass spectrometric analysis of amyloid material extracted from the spleen showed serum AA 2 (SAA2) peptide as well as a unique peptide sequence previously reported in a pig with AA amyloidosis...
August 12, 2016: Veterinary Pathology
Franziska Warneboldt, Saara J Sander, Andreas Beineke, Peter Valentin-Weigand, Josef Kamphues, Christoph Georg Baums
Streptococcus (S.) suis translocates across the intestinal barrier of piglets after intraintestinal application. Based on these findings, an oro-gastrointestinal infection route has been proposed. Thus, the objective of this study was to investigate the survival of S. suis in the porcine stomach. Whereas surviving bacteria of S. suis serotypes 2 and 9 were not detectable after 60 min of incubation in stomach contents with a comparatively high gastric pH of 5 due to feeding of fine pellets, the number of Salmonella Derby bacteria increased under these conditions...
August 6, 2016: Pathogens
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