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Genetics of infective endocarditis

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https://www.readbyqxmd.com/read/28729207/first-two-cases-of-severe-multifocal-infections-caused-by-klebsiella-pneumoniae-in-switzerland-characterization-of-an-atypical-non-k1-k2-serotype-strain-causing-liver-abscess-and-endocarditis
#1
Baharak Babouee Flury, Valentina Donà, Niccolo Buetti, Hansjakob Furrer, Andrea Endimiani
BACKGROUND: We describe the first two multifocal invasive infections due to Klebsiella pneumoniae recently observed in Switzerland. METHODS: Phenotypic (MIC assays and string test) and molecular analyses (PCR/Sequencing for bla, virulence factor genes and whole genome sequencing for one strain) were performed to characterize the causative K. pneumoniae isolates. RESULTS: Both K. pneumoniae isolates (Kp1 and Kp2) were pan-susceptible to antibiotics and produced narrow-spectrum SHV β-lactamases...
July 17, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28722567/bartonella-infection-in-hematophagous-insectivorous-and-phytophagous-bat-populations-of-central-mexico-and-the-yucatan-peninsula
#2
Matthew J Stuckey, Bruno B Chomel, Guillermo Galvez-Romero, José Ignacio Olave-Leyva, Cirani Obregón-Morales, Hayde Moreno-Sandoval, Nidia Aréchiga-Ceballos, Mónica Salas-Rojas, Alvaro Aguilar-Setién
Although emerging nonviral pathogens remain relatively understudied in bat populations, there is an increasing focus on identifying bat-associated bartonellae around the world. Many novel Bartonella strains have been described from both bats and their arthropod ectoparasites, including Bartonella mayotimonensis, a zoonotic agent of human endocarditis. This cross-sectional study was designed to describe novel Bartonella strains isolated from bats sampled in Mexico and evaluate factors potentially associated with infection...
June 12, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28691456/genetic-correlation-between-rheumatoid-arthritis-and-periodontal-disease-the-role-of-sex-and-il-10
#3
L Azzi, S Rania, F Spadari, R Vinci, M Manfredini, F Croveri, A Boggio, L Tettamanti, A Tagliabue, J Silvestre-Rangil, C Bellintani
The chronic stimulation of the immune system due to the presence of bacterial antigens within periodontal tissues has been associated with several autoimmune diseases, like diabetes mellitus, infective endocarditis or cardiovascular atherosclerosis. The current study aims at evaluating the correlation between Rheumatoid Arthritis (RA) and Periodontal Disease (PD) with special attention to genetic polymorphisms in cytokine expression. A total number of 34 patients affected by RA were recruited. Each of them underwent haematochemical analysis and data were collected for Rheumatoid Factor (RF), Anti-Citrullinated Protein’s Antibody (CCP) and HLA-BDR1...
April 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28670302/prevalence-and-genetic-diversity-of-enterococcus-faecalis-isolates-from-mineral-water-and-spring-water-in-china
#4
Lei Wei, Qingping Wu, Jumei Zhang, Weipeng Guo, Moutong Chen, Liang Xue, Juan Wang, Lianying Ma
Enterococcus faecalis is an important opportunistic pathogen which is frequently detected in mineral water and spring water for human consumption and causes human urinary tract infections, endocarditis and neonatal sepsis. The aim of this study was to determine the prevalence, virulence genes, antimicrobial resistance and genetic diversity of E. faecalis from mineral water and spring water in China. Of 314 water samples collected from January 2013 to January 2014, 48 samples (15.3%) were contaminated E. faecalis...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28659664/inherited-variation-in-cytokine-acute-phase-response-and-calcium-metabolism-genes-affects-susceptibility-to-infective-endocarditis
#5
Anastasia V Ponasenko, Anton G Kutikhin, Maria V Khutornaya, Natalia V Rutkovskaya, Natalia V Kondyukova, Yuri N Odarenko, Yana V Kazachek, Anna V Tsepokina, Leonid S Barbarash, Arseniy E Yuzhalin
Infective endocarditis (IE) is a septic inflammation of the endocardium. Recognition of microbial patterns, cytokine and acute phase responses, hemostasis features, and alterations in plasma lipid and calcium profile all have been reported to affect pathogenesis and clinical course of IE. Having recruited 123 patients with IE and 300 age-, sex-, and ethnicity-matched healthy blood donors, we profiled their genomic DNA for 35 functionally significant polymorphisms within the 22 selected genes involved in the abovementioned pathways, with the further genetic association analysis...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/28659548/pathogenicity-of-enterococci
#6
Yasuyoshi Ike
Enterococci belong to the group of lactic acid bacteria (LAB), and inhabit the gastrointestinal tracts of a wide variety of animals from insects and to human, and the commensal organism in humans and animals. The commensal/probiotic role of enterococci has evolved through thousands of years in mutual coexistence. Enterococcus have many favorable traits that have been appreciated in food fermentation and preservation, and many serve as probiotics to promote health. While lactobacillus have been shown to confer numerous benefits on and often regarded as health bringing organisms, enterococci have become more recognized as emerging human pathogens in recent years...
2017: Nihon Saikingaku Zasshi. Japanese Journal of Bacteriology
https://www.readbyqxmd.com/read/28629255/hemophagocytic-lymphohistiocytosis-associated-to-haemophilus-parainfluenzae-endocarditis-a-case-report
#7
D I Costescu Strachinaru, M Chaumont, D Gobin, L Sattar, M Strachinaru, E Karakike, A Roman, D Konopnicki
BACKGROUND: Hemophagocytic lymphohistiocytosis (HLH) is a rare but severe and potentially fatal syndrome that is characterized by increased proliferation and activation of benign macrophages with hemophagocytosis throughout the reticuloendothelial system. This syndrome is classified as primary (genetic) or secondary when acquired in the context of infections (usually viral), malignancies, rheumatologic and metabolic diseases. CASE SUMMARY: We report a case of HLH complicating a Haemophilus parainfluenzae mitral valve endocarditis and resolving under antibiotic and surgical treatment alone...
June 19, 2017: Acta Clinica Belgica
https://www.readbyqxmd.com/read/28592797/distinct-biological-potential-of-streptococcus-gordonii-and-streptococcus-sanguinis-revealed-by-comparative-genome-analysis
#8
Wenning Zheng, Mui Fern Tan, Lesley A Old, Ian C Paterson, Nicholas S Jakubovics, Siew Woh Choo
Streptococcus gordonii and Streptococcus sanguinis are pioneer colonizers of dental plaque and important agents of bacterial infective endocarditis (IE). To gain a greater understanding of these two closely related species, we performed comparative analyses on 14 new S. gordonii and 5 S. sanguinis strains using various bioinformatics approaches. We revealed S. gordonii and S. sanguinis harbor open pan-genomes and share generally high sequence homology and number of core genes including virulence genes. However, we observed subtle differences in genomic islands and prophages between the species...
June 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28473881/streptococcus-tigurinus-is-frequent-among-gtfr-negative-streptococcus-oralis-isolates-and-in-the-human-oral-cavity-but-highly-virulent-strains-are-uncommon
#9
Georg Conrads, Svenja Barth, Maureen Möckel, Lucas Lenz, Mark van der Linden, Karsten Henne
Streptococcus tigurinus is a new member of the Mitis group and is associated with infective endocarditis. Low and high virulent variants have been described. A search was made in the national reference collection of endocarditis isolates for S. tigurinus-like strains by sequencing housekeeping genes (16S rRNA-gene, gdh, groEL, sodA). The strains were further profiled by polymerase chain reaction (PCR) targeting a choice of virulence genes (rib-like, cshA-like, gtfR, int, pitA, hylA). To study the prevalence and abundance of S...
2017: Journal of Oral Microbiology
https://www.readbyqxmd.com/read/28438095/arcobacter-an-emerging-food-borne-zoonotic-pathogen-its-public-health-concerns-and-advances-in-diagnosis-and-control%C3%A2-%C3%A2-a-comprehensive-review
#10
Thadiyam Puram Ramees, Kuldeep Dhama, Kumaragurubaran Karthik, Ramswaroop Singh Rathore, Ashok Kumar, Mani Saminathan, Ruchi Tiwari, Yashpal Singh Malik, Raj Kumar Singh
Arcobacter has emerged as an important food-borne zoonotic pathogen, causing sometimes serious infections in humans and animals. Newer species of Arcobacter are being incessantly emerging (presently 25 species have been identified) with novel information on the evolutionary mechanisms and genetic diversity among different Arcobacter species. These have been reported from chickens, domestic animals (cattle, pigs, sheep, horses, dogs), reptiles (lizards, snakes and chelonians), meat (poultry, pork, goat, lamb, beef, rabbit), vegetables and from humans in different countries...
December 2017: Veterinary Quarterly
https://www.readbyqxmd.com/read/28412525/liver-microbiome-of-peromyscus-leucopus-a-key-reservoir-host-species-for-emerging-infectious-diseases-in-north-america
#11
A André, A Mouton, V Millien, J Michaux
Microbiome studies generally focus on the gut microbiome, which is composed of a large proportion of commensal bacteria. Here we propose a first analysis of the liver microbiome using next generation sequencing as a tool to detect potentially pathogenic strains. We used Peromyscus leucopus, the main reservoir host species of Lyme disease in eastern North America, as a model and sequenced V5-V6 regions of the 16S gene from 18 populations in southern Quebec (Canada). The Lactobacillus genus was found to dominate the liver microbiome...
April 13, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28283005/-comparison-of-maldi-tof-and-16s-rrna-methods-in-identification-of-viridans-group-streptococci
#12
Serap Süzük Yıldız, Banu Kaşkatepe, Salih Altınok, Mustafa Çetin, Alper Karagöz, Sümeyra Savaş
Accurate identification of viridans group streptococci (VGS) frequently encountered as a causative agent of infective endocarditis is always a challenge for the clinical microbiology laboratory. Clinical microbiology laboratories generally use semi automatic/full automatic systems, molecular methods and also conventional methods for the identification of these bacteria. There are recent published studies that have used MALDI-TOF (Matrix Assisted Laser Ionization Mass Spectrometry-Time of Flight) systems in the identification of VGS...
January 2017: Mikrobiyoloji Bülteni
https://www.readbyqxmd.com/read/28238238/bicuspid-aortic-valve-a-review-of-its-genetics-and-clinical-significance
#13
Lei Wang, Li Ming Wang, Wen Chen, Xin Chen
The aim of this review was to describe recent advancements in the understanding of bicuspid aortic valve (BAV). BAV is the most common congenital cardiac anomaly, and affects between 0.46% and 1.37% of the population. There is a male predominance of approximately 3:1.While isolated BAV is found in certain patients, it is often associated with other congenital cardiac lesions, including dilatation of the thoracic aorta, coarctation of the aorta and abnormalities of the coronary anatomy. In most cases, it remains undetected until the patient contracts infective endocarditis, or calcification occurs...
September 2016: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28217558/the-scid-mouse-model-for-identifying-virulence-determinants-in-coxiella-burnetii
#14
Erin J van Schaik, Elizabeth D Case, Eric Martinez, Matteo Bonazzi, James E Samuel
Coxiella burnetii is an intracellular, zoonotic pathogen that is the causative agent of Q fever. Infection most frequently occurs after inhalation of contaminated aerosols, which can lead to acute, self-limiting febrile illness or more serve chronic infections such as hepatitis or endocarditis. Macrophages are the principal target cells during infection where C. burnetii resides and replicates within a unique phagolysosome-like compartment, the Coxiella-containing vacuole (CCV). The first virulence determinant described as necessary for infection was full-length lipopolysaccarride (LPS); spontaneous rough mutants (phase II) arise after passage in immuno-incompetent hosts...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28196877/using-quantitative-spectrometry-to-understand-the-influence-of-genetics-and-nutritional-perturbations-on-the-virulence-potential-of-staphylococcus-aureus
#15
Jessica R Chapman, Divya Balasubramanian, Kayan Tam, Manor Askenazi, Richard Copin, Bo Shopsin, Victor J Torres, Beatrix M Ueberheide
Staphylococcus aureus (Sa) is the leading cause of a variety of bacterial infections ranging from superficial skin infections to invasive and life threatening diseases such as septic bacteremia, necrotizing pneumonia, and endocarditis. The success of Sa as a human pathogen is contributed to its ability to adapt to different environments by changing expression, production, or secretion of virulence factors. Although Sa immune evasion is well-studied, the regulation of virulence factors under different nutrient and growth conditions is still not well understood...
April 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/28159672/influence-of-vancomycin-minimum-inhibitory-concentration-on-the-outcome-of-methicillin-susceptible-staphylococcus-aureus-left-sided-infective-endocarditis-treated-with-antistaphylococcal-%C3%AE-lactam-antibiotics-a-prospective-cohort-study-by-the-international-collaboration
#16
J M Pericàs, J A Messina, C Garcia-de-la-Mària, L Park, B K Sharma-Kuinkel, F Marco, D Wray, Z A Kanafani, M Carugati, E Durante-Mangoni, P Tattevin, V H Chu, A Moreno, V G Fowler, J M Miró
OBJECTIVES: Left-sided methicillin-susceptible Staphylococcus aureus (MSSA) endocarditis treated with cloxacillin has a poorer prognosis when the vancomycin minimum inhibitory concentration (MIC) is ≥1.5 mg/L. We aimed to validate this using the International Collaboration on Endocarditis cohort and to analyse whether specific genetic characteristics were associated with a high vancomycin MIC (≥1.5 mg/L) phenotype. METHODS: All patients with left-sided MSSA infective endocarditis treated with antistaphylococcal β-lactam antibiotics between 2000 and 2006 with available isolates were included...
February 1, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28110789/exudative-epidermitis-of-piglets-caused-by-non-toxigenic-staphylococcus-sciuri
#17
Lixin Lu, Kongwang He, Yanxiu Ni, Zhengyu Yu, Aihua Mao
Infections with strains of Staphylococcus sciuri are a potential threat to animal and public health, and a cause for considerable concern. We isolated and identified S. sciuri as a pathogen from an acute outbreak of exudative epidermitis in piglets for further genetic identification using experimental infections. The results of this study showed that S. sciuri strain NJ1306 reproduced exudative epidermitis in experimentally infected 5-day-old piglets. The isolated bacteria also caused sudden death in BALB/c mice following intraperitoneal injection with 5×10(8) CFU of the isolate...
February 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/27918263/mycobacterium-chimaera-colonisation-of-heater-cooler-units-hcu-in-western-australia-2015-investigation-of-possible-iatrogenic-infection-using-whole-genome-sequencing
#18
James Owen Robinson, Geoffrey Wallace Coombs, David John Speers, Terillee Keehner, Anthony David Keil, Victoria D'Abrera, Peter Boan, Stanley Pang
Following the reported link between heater-cooler unit (HCU) colonisation with Mycobacterium chimaera and endocarditis, mycobacterial sampling of all HCUs in use in Western Australia was initiated from August 2015, revealing M. chimaera colonisation in 10 of 15 HCUs. After M. chimaera was isolated from a pleural biopsy from a cardiothoracic patient who may have been exposed to a colonised HCU, a whole genome sequencing investigation was performed involving 65 specimens from 15 HCUs across five hospitals to assess if this infection was related to the HCU...
November 17, 2016: Euro Surveillance: Bulletin Européen sur les Maladies Transmissibles, European Communicable Disease Bulletin
https://www.readbyqxmd.com/read/27892875/the-zoonotic-potential-of-lactococcus-garvieae-an-overview-on-microbiology-epidemiology-virulence-factors-and-relationship-with-its-presence-in-foods
#19
REVIEW
Alicia Gibello, Fátima Galán-Sánchez, M Mar Blanco, Manuel Rodríguez-Iglesias, Lucas Domínguez, José F Fernández-Garayzábal
Lactococcus garvieae is a relevant worldwide fish pathogen affecting various farmed and wild marine and freshwater species. It has also been isolated from other animals, such as ruminants with subclinical mastitis and pigs with pneumonia. From the early 90s, L. garvieae has been associated with different human infections, mainly endocarditis. During the last five years, human infections by this bacterium appear to be increasing, likely due to the improvement in microbiological methods for bacterial identification and the alertness of this bacterium by physicians...
December 2016: Research in Veterinary Science
https://www.readbyqxmd.com/read/27818810/familial-adenomatous-polyposis-manifesting-as-lactococcus-endocarditis-a-case-report-and-review-of-the-association-of-lactococcus-with-underlying-gastrointestinal-disease
#20
Taylor C Bazemore, Stacey A Maskarinec, Kahli Zietlow, Edward F Hendershot, John R Perfect
A 45-year-old male with a prosthetic aortic valve presented to the hospital with several months of generalized malaise. On admission, he was noted to have anemia of unclear etiology and subsequently became febrile with multiple blood cultures growing Lactococcus garvieae. Inpatient workup was concerning for infectious endocarditis (IE) secondary to Lactococcus. The patient was discharged home with appropriate antimicrobial therapy; however, he was readmitted for persistent, symptomatic anemia and underwent colonoscopy, which revealed innumerable colonic polyps consistent with Familial Adenomatous Polyposis (FAP) that was later confirmed with genetic testing...
2016: Case Reports in Infectious Diseases
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