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Streptococcus suis

Haodan Zhu, Yanxiu Ni, Junming Zhou, Zhengyu Yu, Aihua Mao, Dandan Wang, Kongwang He
Streptococcus suis is an important swine pathogen that can also cause severe diseases in humans. Herein, we describe the genome sequence of Streptococcus suis serotype 2 virulent strain SS2-1, which was isolated from a diseased dead pig amid the 1998 Streptococcus suis outbreak in Jiangsu Province in China.
March 8, 2018: Genome Announcements
Quan Li, Yuhang Zhang, Du Dechao, Yu Yanfei, Wei Zhang
Streptococcus suis, an important swine pathogen and a major zoonotic agent, is responsible for severe financial losses in the global swine industry. Although a multitude of virulence factors have been reported, the pathogenesis of S. suis infections remains poorly understood. In our previous work, we identified a potential virulence-associated protein, named PnuC, unique to virulent strains of S. suis serotype 2 (S. suis 2). To investigate the functions of PnuC, the pnuC gene deletion mutant (ΔpnuC) was constructed in S...
March 2018: Veterinary Microbiology
Michael T Sweeney, Brian V Lubbers, Stefan Schwarz, Jeffrey L Watts
Standardized definitions for MDR are currently not available in veterinary medicine despite numerous reports indicating that antimicrobial resistance may be increasing among clinically significant bacteria in livestock and companion animals. As such, assessments of MDR presented in veterinary scientific reports are inconsistent. Herein, we apply previously standardized definitions for MDR, XDR and pandrug resistance (PDR) used in human medicine to animal pathogens and veterinary antimicrobial agents in which MDR is defined as an isolate that is not susceptible to at least one agent in at least three antimicrobial classes, XDR is defined as an isolate that is not susceptible to at least one agent in all but one or two available classes and PDR is defined as an isolate that is not susceptible to all agents in all available classes...
February 22, 2018: Journal of Antimicrobial Chemotherapy
Hongtao Liu, Li Jia, Wenfei Guo, Yingying Sun, Rining Zhu, Shuguang Li, Guanggang Qu, Hexiang Jiang, Junjie Wang, Jingmin Gu, Changjiang Sun, Xin Feng, Wenyu Han, Liancheng Lei
Streptococcus suis serotype 2 (SS2) is a zoonotic pathogen that can cause meningitis both in pigs and in human beings. However, the pathogenesis of central nervous system (CNS) infection caused by SS2 have not yet been elucidated. To find the key molecules in cerebrospinal fluid (CSF) needed for the pathogenesis, a SS2 meningoencephalitic pig model and a SS2 non-meningoencephalitic pig model were established in this study. CSF was collected from infected piglets, and protein profiling was performed with label-free proteomics technology...
2018: Frontiers in Cellular and Infection Microbiology
Peixi Chang, Weitian Li, Guolin Shi, Huan Li, Xiaoqing Yang, Zechen Xia, Yuan Ren, Zhiwei Li, Huanchun Chen, Weicheng Bei
Streptococcus suis is a highly invasive pathogen that can cause sepsis and meningitis in pigs and humans. However, we have limited understanding of the mechanisms S. suis uses to evade innate immunity. To investigate the involvement of the two-component signal transduction system of S. suis in host immune defense, we examined the expression of 15 response regulators of S. suis following stimulation with polymorphonuclear leukocytes (PMNs). We found that several response regulators were significantly up-regulated including vraR...
February 23, 2018: Virulence
Wanquan Liu, Meifang Tan, Chunyan Zhang, Zhuofei Xu, Lu Li, Rui Zhou
Spermidine (Spd), spermine (Spm), and putrescine (Put), which are the most widely distributed cellular polyamines, are essential for normal growth and multiplication of both eukaryotic and prokaryotic cells. In this study, we identified the only putative polyamine transport system PotABCD in Streptococcus suis, a worldwide zoonotic Gram-positive pathogen causing lethal infections in humans and pigs. It was discovered that S. suis could uptake polyamines preferably Spd and Spm. By constructing a potA deleted mutant, we confirmed that PotABCD was responsible for polyamine uptake, and PotD bound to the protein of polyamines...
March 2018: Microbiological Research
Tomonobu Yanase, Daiichi Morii, Satoshi Kamio, Ayako Nishimura, Eri Fukao, Yuri Inose, Yutaka Honma, Nobuo Kitahara, Takayuki Yokozawa, Bin Chang, Toshimi Oda
Streptococcus suis, a gram-positive facultative anaerobe commonly found in pigs, is an emerging zoonotic pathogen. Herein, we describe a case of a 45-year-old male Japanese meat wholesaler with S. suis meningitis and pyogenic ventriculitis. S. suis was isolated from his blood and cerebrospinal fluid culture, and sequence type (ST) and serotype were confirmed to be ST1 and serotype 2, respectively, by multilocus sequence typing and the Quellung reaction. Magnetic resonance imaging (MRI) revealed right labyrinthitis and pyogenic ventriculitis...
February 8, 2018: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
Geng Zou, Jianwei Zhou, Ran Xiao, Liangsheng Zhang, Yuting Cheng, Hui Jin, Lu Li, Lijun Zhang, Bin Wu, Ping Qian, Shaowen Li, Lixin Ren, Jinhong Wang, Olusegun Oshota, Juan Hernandez-Garcia, Thomas M Wileman, Stephen Bentley, Lucy Weinert, Duncan J Maskell, A W Dan Tucker, Rui Zhou
Streptococcus suis (S. suis), a global zoonosis of pigs, shows regional differences in prevalence of human associated disease for Asian and non-Asian countries. The isolation rate and diversity of S. suis on tonsils of healthy slaughter pigs in China and the UK were studied for effects of geography, temperature, pig age and farm type. Isolates underwent analysis of molecular serotype, multilocus sequence type, and virulence-associated genotyping. Although we found no significant difference in positive isolation rates between Chinese and UK farms, the prevalences of serotypes previously associated with human disease were significantly greater in the Chinese collection (p = 0...
February 2, 2018: Applied and Environmental Microbiology
Anusak Kerdsin, Yukihiro Akeda, Dan Takeuchi, Surang Dejsirilert, Marcelo Gottschalk, Kazunori Oishi
The purpose of this study is to characterize Streptococcus suis isolates recovered from human infections regarding serotype distribution, genotypic profile, clinical manifestations, and epidemiology. A total of 668 S. suis isolates recovered from human infections in Thailand were characterized based on serotyping by multiplex PCR and co-agglutination, genotypic profiles by multilocus sequence typing, and PCR for virulence-associated genes, as well as review of medical records. Serotype 2 (94.6%) was predominant, followed by serotype 14 (4...
February 7, 2018: European Journal of Clinical Microbiology & Infectious Diseases
Nadya Velikova
No abstract text is available yet for this article.
February 6, 2018: Virulence
Zhixin Lei, Qianying Liu, Shuaike Yang, Bing Yang, Haseeb Khaliq, Kun Li, Saeed Ahmed, Abdul Sajid, Bingzhou Zhang, Pin Chen, Yinsheng Qiu, Jiyue Cao, Qigai He
The aims of the present study were to establish optimal doses and provide an alternate COPD for florfenicol against Streptococcus suis based on pharmacokinetic-pharmacodynamic integration modeling. The recommended dose (30 mg/kg b.w.) were administered in healthy pigs through intramuscular and intravenous routes for pharmacokinetic studies. The main pharmacokinetic parameters of Cmax, AUC0-24h, AUC, Ke, t1/2ke, MRT, Tmax, and Clb, were estimated as 4.44 μg/ml, 88.85 μg⋅h/ml, 158.56 μg⋅h/ml, 0.048 h-1, 14...
2018: Frontiers in Pharmacology
Wenlong Nan, Lide Qin, Yong Wang, Yueyong Zhang, Pengfei Tan, Yuqi Chen, Kairong Mao, Yiping Chen
BACKGROUND: Brucellosis is a widespread zoonotic disease caused by Gram-negative Brucella bacteria. Immunisation with attenuated vaccine is an effective method of prevention, but it can interfere with diagnosis. Live, attenuated Brucella abortus strain 104M has been used for the prevention of human brucellosis in China since 1965. However, at present, no fast and reliable method exists that can distinguish this strain from field strains. Single nucleotide polymorphism (SNP)-based assays offer a new approach for such discrimination...
January 24, 2018: BMC Veterinary Research
D G S Burch, D Sperling
Amoxicillin has become a major antimicrobial substance in pig medicine for the treatment and control of severe, systemic infections such as Streptococcus suis. The minimum inhibitory concentration 90% (MIC 90) is 0.06 μg amoxicillin/ml, and the proposed epidemiological cut-off value (ECOFF) is 0.5 μg/ml, giving only 0.7% of isolates above the ECOFF or of reduced susceptibility. Clinical breakpoints have not been set for amoxicillin against porcine pathogens yet, hence the use of ECOFFs. It has also been successfully used for bacterial respiratory infections caused by Actinobacillus pleuropneumoniae and Pasteurella multocida...
January 19, 2018: Journal of Veterinary Pharmacology and Therapeutics
Mihaja Raberahona, Saïda Rasoanandrasana, Vonintsoa Lalaina Rahajamanana, Felana Ranaivo-Rabetokotany, Volatiana Andriananja, Fetra Angelot Rakotomalala, Mamy Jean de Dieu Randria, Luc Rakotovao, Corinne Marois-Créhan, Véronique Tocqueville, Fabrice Touzain, Mala Rakoto-Andrianarivelo
Two cases of meningitis caused by Streptococcus suis occurred in Madagascar, 1 in 2015 and 1 in 2016. We report the characterization of the novel sequence type, 834, which carried the mrp+/sly+/epf+ virulence marker and a mutation G→T at position 174, leading to a substitution mutS1 to mutS284.
February 2018: Emerging Infectious Diseases
Han Zheng, Pengchen Du, Xiaotong Qiu, Anusak Kerdsin, David Roy, Xuemei Bai, Jianguo Xu, Ana I Vela, Marcelo Gottschalk
Streptococcus suis is one of the most important bacterial pathogens in the porcine industry and also a zoonotic agent. Serotype 9 is becoming one of the most prevalent serotypes within the S. suis population in certain European countries. In the present study, serotype 9 strains isolated from a country where infection due to this serotype is endemic (Spain), were compared to those recovered from Canada, where this serotype is rarely isolated from diseased pigs. For comparison purposes, strains from Brazil and the only strain isolated from a human case, in Thailand, were also incorporated...
January 9, 2018: Veterinary Research
Annabelle Mathieu-Denoncourt, Corinne Letendre, Jean-Philippe Auger, Mariela Segura, Virginia Aragon, Sonia Lacouture, Marcelo Gottschalk
Streptococcus suis and Haemophilus parasuis are normal inhabitants of the porcine upper respiratory tract but are also among the most frequent causes of disease in weaned piglets worldwide, causing inflammatory diseases such as septicemia, meningitis and pneumonia. Using an in vitro model of infection with tracheal epithelial cells or primary alveolar macrophages (PAMs), it was possible to determine the interaction between S. suis serotype 2 and H. parasuis strains with different level of virulence. Within H...
January 6, 2018: Pathogens
Jacek Dutkiewicz, Jacek Sroka, Violetta Zając, Bernard Wasiński, Ewa Cisak, Anna Sawczyn, Anna Kloc, Angelina Wójcik-Fatla
<i>Streptococcus suis</i> (ex Elliot 1966, Kilpper-Bälz & Schleifer 1987) is a facultatively anaerobic Gram-positive ovoid or coccal bacterium surrounded by a polysaccharide capsule. Based on the antigenic diversity of the capsule, <i>S. suis</i> strains are classified serologically into 35 serotypes. <i>Streptococcus suis</i> is a commensal of pigs, commonly colonizing their tonsils and nasal cavities, mostly in weaning piglets between 4-10 weeks of age. This species occurs also in cattle and other mammals, in birds and in humans...
December 23, 2017: Annals of Agricultural and Environmental Medicine: AAEM
Yanfei Yu, Yunyun Qian, Dechao Du, Quan Li, Chenyang Xu, Hanze Liu, Mianmian Chen, Huochun Yao, Chengping Lu, Wei Zhang
Streptococcus suis (S. suis) is an emerging zoonotic agent that is responsible for significant economic losses to the porcine industry worldwide. However, most research regarding the pathogenic mechanisms has used in vitro cultures of S. suis, which may not provide an accurate representation of the in vivo biological activities. In this study, 188 differential abundance S. suis proteins were identified in in vivo samples obtained from the blood of the infected pigs. These were compared with in vitro samples by a Tandem Mass Tags (TMT) experiment...
December 13, 2017: Journal of Proteomics
Zhixin Lei, Qianying Liu, Bing Yang, Haseeb Khaliq, Jiyue Cao, Qigai He
Marbofloxacin is a fluoroquinolone antibiotic and highly effective treatment for respiratory diseases. Here we aimed to evaluate the ex vivo activity of marbofloxacin against Streptococcus suis in pig serum, as well as the optimal dosages scheme for avoiding the fluoroquinolone resistance development. A single dose of 8 mg/kg body weight (bw) was administrated orally to healthy pigs and serum samples were collected during the next 72 h. Serum marbofloxacin content was determined by high-performance liquid chromatography...
2017: Frontiers in Pharmacology
Susan L Brockmeier, Crystal L Loving, Tracy L Nicholson, Jinhong Wang, Sarah E Peters, Lucy Weinert, Roy Chaudhuri, David J Seilly, Paul R Langford, Andrew Rycroft, Brendan W Wren, Duncan J Maskell, Alexander W Tucker
Streptococcus suis is a bacterium that is commonly carried in the respiratory tract and that is also one of the most important invasive pathogens of swine, commonly causing meningitis, arthritis, and septicemia. Due to the existence of many serotypes and a wide range of immune evasion capabilities, efficacious vaccines are not readily available. The selection of S. suis protein candidates for inclusion in a vaccine was accomplished by identifying fitness genes through a functional genomics screen and selecting conserved predicted surface-associated proteins...
March 2018: Infection and Immunity
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