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https://www.readbyqxmd.com/read/28337607/phenotypic-changes-of-methicillin-resistant-staphylococcus-aureus-during-vancomycin-therapy-for-persistent-bacteraemia-and-related-clinical-outcome
#1
T Kim, E S Kim, S Y Park, H Sung, M-N Kim, S-H Kim, S-O Lee, S-H Choi, J-Y Jeong, J H Woo, Y P Chong, Y S Kim
Persistent bacteraemia (PB) due to methicillin-resistant Staphylococcus aureus (MRSA) that fails to respond to glycopeptide therapy is a well-documented clinical problem. There are limited data on changes in agr functionality, vancomycin susceptibility and heteroresistance during MRSA PB. Thus, the frequency of these changes and their clinical significance remain unclear. Only patients with MRSA PB (≥7 days) from a prospective cohort of S. aureus bacteraemia were included. We collected isogenic paired strains and compared vancomycin MIC, vancomycin heteroresistance, and agr functionality between initial and final blood isolates...
March 23, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28333236/antimicrobial-salvage-therapy-for-native-valve-mrsa-endocarditis
#2
Jennifer Cortes, Ala-Eddin S Sagar, Yeunju Lee, Uday Sandhu, Kamran Boka
No abstract text is available yet for this article.
February 28, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28316631/potential-impact-of-rapid-blood-culture-testing-for-gram-positive-bacteremia-in-japan-with-the-verigene-gram-positive-blood-culture-test
#3
Ken Kikuchi, Mari Matsuda, Shigekazu Iguchi, Tomonori Mizutani, Keiichi Hiramatsu, Michiru Tega-Ishii, Kaori Sansaka, Kenta Negishi, Kimie Shimada, Jun Umemura, Shigeyuki Notake, Hideji Yanagisawa, Hiroshi Takahashi, Reiko Yabusaki, Hideki Araoka, Akiko Yoneyama
Background. Early detection of Gram-positive bacteremia and timely appropriate antimicrobial therapy are required for decreasing patient mortality. The purpose of our study was to evaluate the performance of the Verigene Gram-positive blood culture assay (BC-GP) in two special healthcare settings and determine the potential impact of rapid blood culture testing for Gram-positive bacteremia within the Japanese healthcare delivery system. Furthermore, the study included simulated blood cultures, which included a library of well-characterized methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci (VRE) isolates reflecting different geographical regions in Japan...
2017: Canadian Journal of Infectious Diseases & Medical Microbiology
https://www.readbyqxmd.com/read/28314997/clinical-and-microbiological-outcomes-in-haematogenous-spondylodiscitis-treated-conservatively
#4
Tiziana Ascione, Giovanni Balato, Sigismondo Luca Di Donato, Pasquale Pagliano, Francesco Granata, Gianluca Colella, Carlo Ruosi
INTRODUCTION: Spondylodiscitis refers to infections of the intervertebral disc and the adjacent vertebral body. Although it is still considered a rare condition, its rate is projected to increase. Mortality rate is considered to be low, but an estimated one third of the survivors experience residual disabilities. Literature shows that uncomplicated spondylodiscitis can be adequately treated by early antibiotic therapy and immobilization. The aim of the study is to evaluate the outcome of conservative treatment in patients with haematogenous spondylodiscitis...
March 17, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28304109/methicillin-resistant-staphylococcus-aureus-mrsa-a-controversial-food-borne-pathogen
#5
REVIEW
Daniil Sergelidis, Apostolos S Angelidis
Methicillin-resistant Staphylococcus aureus (MRSA) is a major cause of severe healthcare-associated (HA) infections. Although during the last decade the incidence of HA invasive infections has dropped, the incidence of community-associated MRSA (CA-MRSA) infections has risen among the general population. Moreover, CA-MRSA, livestock-associated MRSA (LA-MRSA) and HA MRSA (HA-MRSA) can be found in foods intended for human consumption. Several studies from different geographical areas have reported the presence of enterotoxin genes in several MRSA food isolates...
March 17, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28293153/susceptibility-profile-of-methicillin-resistant-staphylococcus-aureus-to-linezolid-in-clinical-isolates
#6
Ali Shariq, Syed Bilal Tanvir, Atif Zaman, Salman Khan, Armeena Anis, Misha Aftab Khan, Sumaira Ahmed
OBJECTIVE: To determine the resistance and sensitivity pattern of methicillin-resistant Staphylococcus aureus (MRSA) isolates to linezolid (LZD) along with its prevalence in a tertiary care hospital of Karachi, Pakistan. MATERIALS AND METHODS: A cross-sectional study was carried out. This study lasted for about 1 year. Prevalence and sensitivity of LZD, vancomycin, and oxacillin was tested against isolates of MRSA. RESULTS: Out of total 369 specimens 165 were found to be MRSA making the prevalence in our study 44...
January 2017: International Journal of Health Sciences
https://www.readbyqxmd.com/read/28291334/rapid-real-time-antimicrobial-susceptibility-testing-with-electrical-sensing-on-plastic-microchips-with-printed-electrodes
#7
Mohammadali Safavieh, Hardik Jeetendra Pandya, Maanasa Venkataraman, Prudhvi Thirumalaraju, Manoj Kumar Kanakasabapathy, Anupriya Singh, Devbalaji Prabhakar, Manjyot Kaur Chug, Hadi Shafiee
Rapid antimicrobial susceptibility testing is important for efficient and timely therapeutic decision making. Due to globally spread bacterial resistance, the efficacy of antibiotics is increasingly being impeded. Conventional antibiotic tests rely on bacterial culture, which is time-consuming and can lead to potentially inappropriate antibiotic prescription and up-front broad range of antibiotic use. There is an urgent need to develop point-of-care platform technologies to rapidly detect pathogens, identify the right antibiotics, and monitor mutations to help adjust therapy...
March 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28276799/comparison-of-outcome-and-clinical-characteristics-of-bacteremia-caused-by-methicillin-resistant-penicillin-resistant-and-penicillin-susceptible-staphylococcus-aureus-strains
#8
Elina Jokinen, Janne Laine, Reetta Huttunen, Pekka Rahikka, Heini Huhtala, Risto Vuento, Jaana Vuopio, Jaana Syrjänen
BACKGROUND: The aim of this study was to assess the association of methicillin resistance and penicillinase production with clinical characteristics and outcome of Staphylococcus aureus bacteremia. METHODS: For 126 patients with methicillin-resistant Staphylococcus aureus (MRSA) bacteremia, 378 age- and gender-matched controls with methicillin-susceptible Staphylococcus aureus (MSSA) bacteremia were selected. Of controls, 126 had bacteremia caused by penicillin-susceptible strains (PSSA) and 252 by penicillinase-producing strains (PRSA)...
February 28, 2017: Infectious Diseases
https://www.readbyqxmd.com/read/28270804/eradication-and-sensitization-of-methicillin-resistant-staphylococcus-aureus-to-methicillin-with-bioactive-extracts-of-berry-pomace
#9
Serajus Salaheen, Mengfei Peng, Jungsoo Joo, Hironori Teramoto, Debabrata Biswas
The therapeutic roles of phenolic blueberry (Vaccinium corymbosum) and blackberry (Rubus fruticosus) pomace (commercial byproduct) extracts (BPE) and their mechanism of actions were evaluated against methicillin resistant Staphylococcus aureus (MRSA). Five major phenolic acids of BPE, e.g., protocatechuic, p. coumaric, vanillic, caffeic, and gallic acids, as well as crude BPE completely inhibited the growth of vegetative MRSA in vitro while BPE+methicillin significantly reduced MRSA biofilm formation on plastic surface...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28264613/pharmacokinetic-drug-evaluation-of-ceftobiprole-for-the-treatment-of-mrsa
#10
Karolyn S Horn, Larry H Danziger, Keith A Rodvold, Robert C Glowacki
Methicillin-resistant Staphylococcus aureus (MRSA), while decreasing in overall incidence, is still a prominent concern world-wide. New agents coming to market in the last 10 years allow practitioners to optimize treatment for MRSA infections. Ceftobiprole is a cephalosporin agent with MRSA activity, currently approved in selected countries for the treatment of community-acquired pneumonia and hospital-acquired pneumonia. Areas covered: Relevant literature regarding spectrum of activity, pharmacokinetics, pharmacodynamics, and clinical trials will be discussed...
March 17, 2017: Expert Opinion on Drug Metabolism & Toxicology
https://www.readbyqxmd.com/read/28261736/dual-antibacterial-activities-of-a-chitosan-modified-upconversion-photodynamic-therapy-system-against-drug-resistant-bacteria-in-deep-tissue
#11
Siwen Li, Sisi Cui, Deyan Yin, Qiuyun Zhu, Yuxiang Ma, Zhiyu Qian, Yueqing Gu
Photodynamic therapy (PDT) has recently been proposed as an innovative approach to combat multi-drug resistant (MDR) bacteria. To improve the penetration depth of current PDT, a core-shell upconversion nanoparticle (UCNP) based PDT system, composed of a cationic N-octyl chitosan (OC) coated UCNP loaded with the photosensitizer zinc phthalocyanine (OC-UCNP-ZnPc), was constructed to enhance the antibacterial efficacy against MDR bacteria in deep tissue. The core-shell UCNPs displayed a higher upconversion fluorescence efficiency compared to the inner UCNP core...
March 6, 2017: Nanoscale
https://www.readbyqxmd.com/read/28250621/evolving-rapid-methicillin-resistant-staphylococcus-aureus-detection-cover-all-the-bases
#12
REVIEW
Yamuna Devi Bakthavatchalam, Laura E B Nabarro, Balaji Veeraraghavan
The dissemination of methicillin-resistant (MR) Staphylococcus aureus (SA) in community and health-care settings is of great concern and associated with high mortality and morbidity. Rapid detection of MRSA with short turnaround time can minimize the time to initiate appropriate therapy and further promote infection control. Early detection of MRSA directly from clinical samples is complicated by the frequent association of MRSA with methicillin-susceptible SA (MSSA) and coagulase-negative Staphylococcus (CoNS) species...
January 2017: Journal of Global Infectious Diseases
https://www.readbyqxmd.com/read/28244296/bacterial-species-and-antibiotic-sensitivity-in-korean-patients-diagnosed-with-acute-otitis-media-and-otitis-media-with-effusion
#13
Sang Hoon Kim, Eun Ju Jeon, Seok Min Hong, Chang Hoon Bae, Ho Yun Lee, Moo Kyun Park, Jae Yong Byun, Myung Gu Kim, Seung Geun Yeo
Changes over time in pathogens and their antibiotic sensitivity resulting from the recent overuse and misuse of antibiotics in otitis media (OM) have complicated treatment. This study evaluated changes over 5 years in principal pathogens and their antibiotic sensitivity in patients in Korea diagnosed with acute OM (AOM) and OM with effusion (OME). The study population consisted of 683 patients who visited the outpatient department of otorhinolaryngology in 7 tertiary hospitals in Korea between January 2010 and May 2015 and were diagnosed with acute AOM or OME...
April 2017: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/28242672/towards-individualised-vancomycin-dosing-in-methicillin-resistant-staphylococcus-aureus-bacteraemia-establishment-of-an-auc0-24-threshold-for-nephrotoxicity
#14
R Chavada, N Ghosh, I Sandaradura, M Maley, S J Van Hal
Background: Unlike vancomycin trough concentrations, data on the utility of vancomycin pharmacokinetic (PK) parameters, namely the AUC0-24, in predicting acute kidney injury (AKI) are limited. Our aim was to investigate this relationship in patients receiving vancomycin therapy for methicillin resistant Staphylococcus aureus bacteraemia (MRSA-B).Methods: A single centre retrospective observational cohort study involving 127 consecutive MRSA-B patients was conducted to examine the incidence of AKI, (defined as serum creatinine ≥0...
February 27, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28225264/fatty-acid-comprising-lysine-conjugates-anti-mrsa-agents-that-display-in-vivo-efficacy-by-disrupting-biofilms-with-no-resistance-development
#15
Mohini Mohan Konai, Jayanta Haldar
Methicillin-resistant Staphylococcus aureus (MRSA) have developed resistance to antibiotics of last resort such as vancomycin, linezolid and daptomycin. Additionally, their biofilm forming capability has set an alarming situation in the treatment of bacterial infections. Herein we report the potency of fatty acid comprising lysine conjugates as novel anti-MRSA agents, which were not only capable of killing growing planktonic MRSA at low concentration (MIC = 3.1-6.3 µg/mL), but also displayed potent activity against non-dividing stationary phase cells...
February 22, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28203096/burden-of-methicillin-resistant-staphylococcus-aureus-pneumonia-among-hospitalized-patients-in-lebanon-and-saudi-arabia
#16
Abdulhakeem O Althaqafi, Madonna J Matar, Rima Moghnieh, Adel F Alothman, Thamer H Alenazi, Fayssal Farahat, Shelby Corman, Caitlyn T Solem, Nirvana Raghubir, Cynthia Macahilig, Seema Haider, Jennifer M Stephens
OBJECTIVES: The objective of this study is to describe the real-world treatment patterns and burden of suspected or confirmed methicillin-resistant Staphylococcus aureus (MRSA) pneumonia in Saudi Arabia and Lebanon. METHODS: A retrospective chart review study evaluated 2011-2012 data from hospitals in Saudi Arabia and Lebanon. Patients were included if they had been discharged with a diagnosis of MRSA pneumonia, which was culture proven or suspected based on clinical criteria...
2017: Infection and Drug Resistance
https://www.readbyqxmd.com/read/28195616/clinical-features-and-management-of-subretinal-abscesses-secondary-to-methicillin-resistant-staphylococcus-aureus-endogenous-endophthalmitis
#17
Jorge Fortun, Yasha S Modi, Angela Bessette, Jordan Heffez, Petros Carvounis, Daniel S Petkovsek, Nicholas G Anderson, Daniel Martin, Sunil Srivastava
BACKGROUND AND OBJECTIVE: To describe the clinical features, management, and immediate outcomes of patients with subretinal abscesses secondary to methicillin-resistant Staphylococcus aureus (MRSA) endogenous endophthalmitis. PATIENTS AND METHODS: Eleven eyes of seven patients were identified by retrospective chart review. Demographics, initial presentation, examination findings, imaging, cultures, treatments, and short-term outcomes were reviewed. RESULTS: Eleven eyes of seven patients presented with subretinal abscesses secondary to MRSA endogenous endophthalmitis...
February 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28186134/virulence-inhibitors-from-brazilian-peppertree-block-quorum-sensing-and-abate-dermonecrosis-in-skin-infection-models
#18
Amelia Muhs, James T Lyles, Corey P Parlet, Kate Nelson, Jeffery S Kavanaugh, Alexander R Horswill, Cassandra L Quave
Widespread antibiotic resistance is on the rise and current therapies are becoming increasingly limited in both scope and efficacy. Methicillin-resistant Staphylococcus aureus (MRSA) represents a major contributor to this trend. Quorum sensing controlled virulence factors include secreted toxins responsible for extensive damage to host tissues and evasion of the immune system response; they are major contributors to morbidity and mortality. Investigation of botanical folk medicines for wounds and infections led us to study Schinus terebinthifolia (Brazilian Peppertree) as a potential source of virulence inhibitors...
February 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28184157/silver-loaded-nanotubular-structures-enhanced-bactericidal-efficiency-of-antibiotics-with-synergistic-effect-in-vitro-and-in-vivo
#19
Na Xu, Hao Cheng, Jiangwen Xu, Feng Li, Biao Gao, Zi Li, Chenghao Gao, Kaifu Huo, Jijiang Fu, Wei Xiong
Antibiotic-resistant bacteria have become a major issue due to the long-term use and abuse of antibiotics in treatments in clinics. The combination therapy of antibiotics and silver (Ag) nanoparticles is an effective way of both enhancing the antibacterial effect and decreasing the usage of antibiotics. Although the method has been proved to be effective in vitro, no in vivo tests have been carried out at present. Herein, we described a combination therapy of local delivery of Ag and systemic antibiotics treatment in vitro in an infection model of rat...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28179010/characterization-and-complete-genome-of-the-virulent-myoviridae-phage-jd007-active-against-a-variety-of-staphylococcus-aureus-isolates-from-different-hospitals-in-shanghai-china
#20
Zelin Cui, Tingting Feng, Feifei Gu, Qingtian Li, Ke Dong, Yan Zhang, Yongzhang Zhu, Lizhong Han, Jinhong Qin, Xiaokui Guo
BACKGROUND: The implementation of phage therapy is re-emerging with the increase in widespread antibiotic-resistant bacteria. METHODS: Staphylococcus phage JD007 was characterized and its complete genome sequence analysed. RESULTS: Staphylococcus phage JD007 was classified as belonging to the Myoviridae family based on its morphology, as observed by transmission electron microscopy. Its lytic activity was stable between pH 5-11 and below 42 °C; moreover, an absorbance curve showed that nearly 90% of the viral particles had adsorbed to its host after a 20 min co-incubation...
February 8, 2017: Virology Journal
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