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Genetic characteristics of MRSA

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https://www.readbyqxmd.com/read/29928269/molecular-characteristics-of-community-associated-staphylococcus-aureus-isolates-from-pediatric-patients-with-bloodstream-infections-between-2012-and-2017-in-shanghai-china
#1
Xing Wang, Qian Liu, He Zhang, Xia Li, Weichun Huang, Qihua Fu, Min Li
Staphylococcus aureus is known as an invasive human pathogen, resulting in significant morbidity and mortality worldwide; however, information on community-associated S. aureus (CA-SA) from bloodstream infections (BSI) in children in China remains scarce. This study aimed to investigate the molecular characteristics of 78 CA-SA isolates recovered from pediatric patients with BSI between 2012 and 2017 in Shanghai. All isolates including 51 (65.4%) methicillin-susceptible S. aureus (MSSA) and 27 (34.6%) methicillin-resistant S...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29879195/characterization-of-genetic-changes-associated-with-daptomycin-nonsusceptibility-in-staphylococcus-aureus
#2
Zhuo Ma, Erica Lasek-Nesselquist, Jackson Lu, Ryan Schneider, Riddhi Shah, George Oliva, Janice Pata, Kathleen McDonough, Manjunath P Pai, Warren E Rose, George Sakoulas, Meenakshi Malik
The extensive use of daptomycin (DAP) for treatment of methicillin-resistant Staphylococcus aureus (MRSA) infections in the last decade has led to the emergence of DAP non-susceptible (DNS) Staphylococcus aureus strains. A better understanding of the molecular changes underlying DAP-non-susceptibility is required for early diagnosis and intervention with alternate combination therapies. The phenotypic changes associated with DNS strains have been well established. However, the genotypic changes-especially the kinetics of expression of the genes responsible for DAP-non-susceptibility are not well understood...
2018: PloS One
https://www.readbyqxmd.com/read/29805051/emergence-of-livestock-associated-mrsa-isolated-from-cystic-fibrosis-patients-result-of-a-belgian-national-survey
#3
M Dodémont, M A Argudín, J Willekens, E Vanderhelst, D Pierard, V Y Miendje Deyi, L Hanssens, H Franckx, P Schelstraete, I Leroux-Roels, C Nonhoff, A Deplano, C Knoop, A Malfroot, O Denis
BACKGROUND: This study aims to determine the prevalence and characteristics of Staphylococcus aureus in Belgian cystic fibrosis (CF) patients. METHODS: Non-duplicate respiratory samples from 510 CF-patients (2012-2013) were examined. One isolate per patient was analysed unless different phenotypes were recovered. Isolates were investigated for mecA/mecC, toxins presence, spa-typing, MLST and SCCmec-typing. Potential livestock-associated (LA) isolates were examined for their immune-evasion-cluster (IEC) genes...
May 24, 2018: Journal of Cystic Fibrosis: Official Journal of the European Cystic Fibrosis Society
https://www.readbyqxmd.com/read/29769634/in-vitro-generation-of-panton-valentine-leukocidin-pvl-in-clinical-methicillin-resistant-staphylococcus-aureus-mrsa-and-its-correlation-with-pvl-variant-clonal-complex-infection-type
#4
Chuanling Zhang, Yuanyu Guo, Xu Chu
The amount of Panton-Valentine leukocidin (PVL) is diverse among Staphylococcus aureus isolates from different geographical regions, and its significance in some infections is disputed. However, data concerning this information in China are limited. Fifty-one lukSF-PV+ methicillin-resistant Staphylococcus aureus (MRSA) isolates gathered from varying infections were used for PVL production using enzyme-linked immunosorbent assay, and the quantity was analyzed in correlation with PVL isoform, genetic background of the isolate, and disease category...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29737262/design-of-bactericidal-peptides-against-escherichia-coli-o157-h7-pseudomonas-aeruginosa-and-methicillin-resistant-staphylococcus-aureus
#5
Jenniffer Cruz, Paola Rondon, Rodrigo Torres, Mauricio Urquiza, Fanny Guzman, Claudio Alvarez, Maria Angeles Abengozar, Daniel A Sierra, Luis Rivas, Roberto Fernandez-Lafuente, Claudia Ortiz
BACKGROUND: Antimicrobial peptides are on the first line of defense against pathogenic microorganisms of many living beings. These compounds are considered natural antibiotics that can overcome bacterial resistance to conventional antibiotics. Due to this characteristic, new peptides with improved properties are quite appealing for designing new strategies for fighting pathogenic bacteria Methods: Sixteen designed peptides were synthesized using Fmoc chemistry; five of them are new cationic antimicrobial peptides (CAMPs) designed using a genetic algorithm that optimizes the antibacterial activity based on selected physicochemical descriptors and 11 analog peptides derived from these five peptides were designed and constructed by single amino acid substitutions...
May 8, 2018: Medicinal Chemistry
https://www.readbyqxmd.com/read/29718242/daptomycin-selects-for-genetic-and-phenotypic-adaptations-leading-to-antibiotic-tolerance-in-mrsa
#6
Andrew D Berti, Neehal Shukla, Aaron D Rottier, J Sue McCrone, Hannah M Turner, Ian R Monk, Sarah L Baines, Benjamin P Howden, Richard A Proctor, Warren E Rose
Objectives: Daptomycin non-susceptibility in Staphylococcus aureus can emerge via the accumulation of single or multiple mutations, each resulting in a slight increase in the daptomycin MIC. The daptomycin-non-susceptible phenotype may include other features such as daptomycin tolerance. This study identifies S. aureus genomic regions that frequently develop mutations following prolonged daptomycin exposure but have not been previously associated with daptomycin non-susceptibility. Methods: Sequence variations in the same eight loci independently observed following 28 day parallel serial passages of S...
April 27, 2018: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29668723/emerging-variants-of-methicillin-resistant-staphylococcus-aureus-genotypes-in-kuwait-hospitals
#7
Samar S Boswihi, Edet E Udo, Stefan Monecke, Bindu Mathew, Bobby Noronha, Tina Verghese, Sajida B Tappa
BACKGROUND: Frequent changes in the epidemiology of methicillin-resistant Staphylococcus aureus (MRSA) occurring worldwide demand regular surveillance to study their composition and distribution in healthcare facilities. We investigated the genotypic characteristics of MRSA obtained in Kuwait hospitals to better understand their clonal distribution. MATERIALS AND METHODS: A total of 1,327 MRSA isolates obtained from clinical samples in 13 Kuwait hospitals from 1 January to 31 December 2016 were investigated using antibiogram, SCCmec typing, spa typing and DNA microarray...
2018: PloS One
https://www.readbyqxmd.com/read/29505885/emergence-of-multidrug-resistant-sequence-type-45-strains-among-borderline-oxacillin-resistant-meca-positive-staphylococcus-aureus-causing-bacteraemia-in-a-medical-centre-in-taiwan
#8
Yu-Tsung Huang, Chun-Hsing Liao, Shey-Ying Chen, Hsin-Sui Hsu, Lee-Jene Teng, Po-Ren Hsueh
Clinical data related to bacteraemia caused by mecA-positive borderline-oxacillin resistant (minimum inhibitory concentrations, 0.5-4 mg/L) Staphylococcus aureus (BORSA) isolates are limited. Patients (age >15 years) with bacteraemia due to BORSA who were admitted to the emergency department in a tertiary hospital between January 2001 and December 2015 were evaluated. Clinical characteristics of patients with bacteraemia caused by BORSA, methicillin-susceptible S. aureus and MRSA were compared. Minimum inhibitory concentrations of 12 antibiotics were determined using the agar dilution method...
March 2, 2018: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/29428976/spa-type-distribution-in-mrsa-and-mssa-bacteremias-and-association-of-spa-clonal-complexes-with-the-clinical-characteristics-of-bacteremia
#9
Elina Jokinen, Laura Lindholm, Reetta Huttunen, Heini Huhtala, Risto Vuento, Jaana Vuopio, Jaana Syrjänen
The genetic distribution of invasive methicillin-susceptible (MSSA) and resistant S. aureus (MRSA) strains has to be addressed in order to target infection control strategies. A large MRSA epidemic caused by a certain MRSA strain (spa type 067) broke out in 2001 in our health district. We wanted to investigate the current spa type distribution in MRSA and MSSA bacteremias and assess the potential association of spa clonal complexes (spaCC) with the clinical characteristics of S. aureus bacteremia. One hundred nine invasive MRSA isolates and 353 invasive MSSA isolates were spa typed and grouped into clonal complexes (spaCC)...
May 2018: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/29378646/detection-and-analysis-of-methicillin-resistant-human-adapted-sequence-type-398-allows-insight-into-community-associated-methicillin-resistant-staphylococcus-aureus-evolution
#10
Lei He, Hong-Xiang Zheng, Yanan Wang, Katherine Y Le, Qian Liu, Jun Shang, Yingxin Dai, Hongwei Meng, Xing Wang, Tianming Li, Qianqian Gao, Juanxiu Qin, Huiying Lu, Michael Otto, Min Li
BACKGROUND: Severe infections with highly virulent community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) are a global problem. However, the molecular events defining the evolution of CA-MRSA are still poorly understood. MRSA of sequence type (ST) 398 is known to frequently infect livestock, while ST398 isolates infecting humans are commonly methicillin-susceptible or represent MRSA originating from livestock-associated (LA)-MRSA. METHODS: We used whole genome sequencing of newly detected CA-MRSA ST398 isolates, in comparison to geographically matched LA-MRSA and methicillin-sensitive ST398, to determine their evolutionary history...
January 29, 2018: Genome Medicine
https://www.readbyqxmd.com/read/29212459/acquisition-and-persistence-of-strain-specific-methicillin-resistant-staphylococcus-aureus-and-their-determinants-in-community-nursing-homes
#11
Nataliya G Batina, Christopher J Crnich, Dörte Döpfer
BACKGROUND: Nursing home residents are frequently colonized with various strains of methicillin-resistant Staphylococcus aureus (MRSA) but the intra-facility dynamics of strain-specific MRSA remains poorly understood. We aimed at identifying and quantifying the associations between acquisition and carriage of MRSA strains and their potential risk factors in community nursing homes using mathematical modeling. METHODS: The data was collected during a longitudinal MRSA surveillance study in six nursing homes in South Central Wisconsin...
December 6, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29204221/antibiotic-resistance-patterns-and-virulence-determinants-of-different-sccmec-and-pulsotypes-of-staphylococcus-aureus-isolated-from-a-major-hospital-in-ilam-iran
#12
REVIEW
Mehdi Abbasi, Majid BaseriSalehi, Nima Bahador, Morovat Taherikalani
Aims & Objectives: The aim of this study is to evaluate genetic relatedness, antibiotic resistance pattern, and virulence characteristics of different types of S. aureus isolated from air, surfaces, staff, and patients in a Public hospital in Ilam. Methods & Materials: A total of 88 of 140 staphylococci identified as S. aureus by conventional and molecular methods were used in this study. Isolate samples were obtained from surfaces, staff, patients, and hospital indoor air...
2017: Open Microbiology Journal
https://www.readbyqxmd.com/read/29203479/host-pathogen-treatment-triad-host-factors-matter-most-in-methicillin-resistant-staphylococcus-aureus-bacteremia-outcomes
#13
M Cristina Vazquez Guillamet, Rodrigo Vazquez, Benjamin Deaton, Jenny Shroba, Laia Vazquez, Renee-Claude Mercier
Previous studies have separately emphasized the importance of host, pathogen, and treatment characteristics in determining short-term or in-hospital mortality rates for patients with methicillin-resistant Staphylococcus aureus (MRSA) bloodstream infections. Less is known about the relative importance of these factors and their interactions in determining short-, medium-, and long-term mortality rates. This is an observational cohort study in which data for all patients admitted to the University of New Mexico (UNM) Health Sciences Center (HSC) between July 2002 and August 2013 with MRSA-positive blood cultures were recorded...
February 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29155125/virulence-characteristics-and-molecular-relatedness-of-methicillin-resistant-staphylococcus-aureus-harboring-different-staphylococcal-cassette-chromosome-mec
#14
Rana El-Baz, Dina E Rizk, Rasha Barwa, Ramadan Hassan
INTRODUCTION: Methicillin resistant Staphylococcus aureus (MRSA) is a versatile pathogen capable of causing multitude of human diseases. It is one of the most important nosocomial pathogen that implicated in community and healthcare associated infections. Therefore, this study aims to characterize different SCCmec elements found in MRSA isolates. Moreover, molecular typing was performed to investigate the genetic relatedness among MRSA isolates. METHODS: Phenotypic identification of MRSA was done by disc diffusion method...
December 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29146256/isolation-purification-structural-elucidation-and-antimicrobial-activities-of-kocumarin-a-novel-antibiotic-isolated-from-actinobacterium-kocuria-marina-cmg-s2-associated-with-the-brown-seaweed-pelvetia-canaliculata
#15
Bushra Uzair, Farid Menaa, Barkat Ali Khan, Faryal Vali Mohammad, Viqar Uddin Ahmad, Ryad Djeribi, Bouzid Menaa
AIMS: Screening of seaweed-associated bacteria capable of producing antimicrobials. METHODS AND RESULTS: Fifteen microbial strains, associated to the brown seaweed Pelvetia canaliculata (Linnaeus) attached to the rocks of Sonmiani Beach (Karachi, Pakistan), were screened. Crude extract filtrates of CMG S2 strain grew on Zobell marine agar (ZMA) had the most remarkable antimicrobial activity. Based on its phenotypic aspects (e.g. Gram-positive, microccoid form), biochemical characteristics (e...
January 2018: Microbiological Research
https://www.readbyqxmd.com/read/29068722/high-occurrence-of-methicillin-resistant-staphylococcus-aureus-in-horses-at-slaughterhouses-compared-with-those-for-recreational-activities-a-professional-and-food-safety-concern
#16
Antonio Parisi, Marta Caruso, Giovanni Normanno, Laura Latorre, Angela Miccolupo, Rosa Fraccalvieri, Francesco Intini, Teresa Manginelli, Gianfranco Santagada
The epidemiology of methicillin-resistant Staphylococcus aureus (MRSA) in horses and its zoonotic potential is poorly understood. The objective of this study is to provide data on the prevalence and genetic characteristics of MRSA isolated from horses on farms, at racecourses, and at slaughterhouses in Italy, using standard and molecular methods. In addition, we report the prevalence of MRSA in horse handlers. Among 388 horses tested by nasal swabs, 27 (7%) were positive for MRSA ST398 (t011, t899, t1255) and ST1 (t127)...
December 2017: Foodborne Pathogens and Disease
https://www.readbyqxmd.com/read/29068720/detection-and-molecular-characterization-of-methicillin-resistant-staphylococcus-aureus-from-table-eggs-in-haripur-pakistan
#17
Muhammad Ali Syed, Syeda Hala Hussain Shah, Yasmin Sherafzal, Syed Shafi-Ur-Rehman, Mushtaq Ahmed Khan, John B Barrett, Tiffanie A Woodley, Bushra Jamil, Shahid Ahmad Abbasi, Charlene R Jackson
Table eggs are nutritionally important food consumed globally. Despite being protected inside the hard shell and a semipermeable membrane, the egg contents may be contaminated with microbes and thus become a possible carrier of infectious agents to humans. A number of medically significant bacterial species such as Salmonella enterica, Listeria monocytogenes, and Yersinia enterocolitica have already been reported from table eggs. More important is the presence of antimicrobial-resistant bacterial strains in this food source...
February 2018: Foodborne Pathogens and Disease
https://www.readbyqxmd.com/read/28818651/genomic-characterization-of-a-paediatric-mrsa-outbreak-by-next-generation-sequencing
#18
E Ugolotti, E Di Marco, R Bandettini, R Biassoni
INTRODUCTION: Twelve strains of meticillin-resistant Staphylococcus aureus (MRSA) isolated during a suspected outbreak in a paediatric intensive care unit were analysed by whole-genome sequencing (WGS). AIM: To define the clonality of MRSA strains to a high discriminative power, and to evaluate the presence of genetic determinants responsible for antibiotic resistance and virulence. RESULTS: Ten out of 12 strains belonged to multi-locus sequence type ST2625, while the other two strains were ST8...
February 2018: Journal of Hospital Infection
https://www.readbyqxmd.com/read/28783429/characterization-of-livestock-associated-methicillin-resistant-staphylococcus-aureus-cc398-and-mecc-positive-cc130-from-zoo-animals-in-the-united-kingdom
#19
Alessio Bortolami, Ranieri Verin, Julian Chantrey, Michela Corrò, Ian Ashpole, Javier Lopez, Dorina Timofte
Little is known about the characteristics and diseases associated with methicillin-resistant Staphylococcus aureus (MRSA) in nondomestic animals. Four presumptive MRSA isolates, obtained from clinical (n = 3) and surveillance specimens (n = 1) from dwarf (Helogale parvula) and yellow mongooses (Cynictis penicillata) from a United Kingdom zoo, were analyzed by PCR for detection of mecA and mecC-mediated methicillin resistance, and virulence genes. Isolates were genotyped by multilocus sequence typing (MLST) and staphylococcal cassette chromosome mec (SCCmec) and spa sequence typing...
October 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28748029/prevalence-of-and-risk-factors-for-methicillin-resistant-staphylococcus-aureus-colonization-among-human-immunodeficient-virus-infected-outpatients-in-taiwan-oral-candida-colonization-as-a-comparator
#20
Chi-Jung Wu, Wen-Chien Ko, Mao-Wang Ho, Hsi-Hsun Lin, Yun-Liang Yang, Jiun-Nong Lin, I-Wen Huang, Hui-Ying Wang, Jui-Fen Lai, Yih-Ru Shiau, Li-Yun Hsieh, Hui-Ting Chen, Chih-Chao Lin, Wen-Li Chu, Hsiu-Jung Lo, Tsai-Ling Lauderdale
Human immuodeficency virus (HIV)-infected patients receiving highly active antiretroviral therapy (HAART) and community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) have increased in recent years in Taiwan. This study was undertaken to determine the prevalence of and risk factors for nasal and oral S. aureus and MRSA colonization among contemporary HIV-infected populations. Clinical variables for S. aureus and MRSA colonization among HIV-infected outpatients from three hospitals were analyzed and compared with those for oral Candida colonization...
2017: Journal of Oral Microbiology
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