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Multi-Drug resistance

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https://www.readbyqxmd.com/read/27909995/solithromycin-a-novel-fluoroketolide-for-the-treatment-of-community-acquired-bacterial-pneumonia
#1
REVIEW
George G Zhanel, Erika Hartel, Heather Adam, Sheryl Zelenitsky, Michael A Zhanel, Alyssa Golden, Frank Schweizer, Bala Gorityala, Philippe R S Lagacé-Wiens, Andrew J Walkty, Alfred S Gin, Daryl J Hoban, Joseph P Lynch, James A Karlowsky
Solithromycin is a novel fluoroketolide developed in both oral and intravenous formulations to address increasing macrolide resistance in pathogens causing community-acquired bacterial pneumonia (CABP). When compared with its macrolide and ketolide predecessors, solithromycin has several structural modifications which increase its ribosomal binding and reduce its propensity to known macrolide resistance mechanisms. Solithromycin, like telithromycin, affects 50S ribosomal subunit formation and function, as well as causing frame-shift errors during translation...
December 1, 2016: Drugs
https://www.readbyqxmd.com/read/27909433/sponge-microbiota-are-a-reservoir-of-functional-antibiotic-resistance-genes
#2
Dennis Versluis, Mari Rodriguez de Evgrafov, Morten O A Sommer, Detmer Sipkema, Hauke Smidt, Mark W J van Passel
Wide application of antibiotics has contributed to the evolution of multi-drug resistant human pathogens, resulting in poorer treatment outcomes for infections. In the marine environment, seawater samples have been investigated as a resistance reservoir; however, no studies have methodically examined sponges as a reservoir of antibiotic resistance. Sponges could be important in this respect because they often contain diverse microbial communities that have the capacity to produce bioactive metabolites. Here, we applied functional metagenomics to study the presence and diversity of functional resistance genes in the sponges Aplysina aerophoba, Petrosia ficiformis, and Corticium candelabrum...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27907102/an-investigation-into-the-etiological-agents-of-swine-dysentery-in-australian-pig-herds
#3
Tom La, Nyree D Phillips, David J Hampson
Swine dysentery (SD) is a mucohemorrhagic colitis, classically seen in grower/finisher pigs and caused by infection with the anaerobic intestinal spirochete Brachyspira hyodysenteriae. More recently, however, the newly described species Brachyspira hampsonii and Brachyspira suanatina have been identified as causing SD in North America and/or Europe. Furthermore, there have been occasions where strains of B. hyodysenteriae have been recovered from healthy pigs, including in multiplier herds with high health status...
2016: PloS One
https://www.readbyqxmd.com/read/27907009/moderate-levels-of-pre-treatment-hiv-1-antiretroviral-drug-resistance-detected-in-the-first-south-african-national-survey
#4
Kim Steegen, Sergio Carmona, Michelle Bronze, Maria A Papathanasopoulos, Gert van Zyl, Dominique Goedhals, William MacLeod, Ian Sanne, Wendy S Stevens
BACKGROUND: In order to assess the level of transmitted and/or pre-treatment antiretroviral drug resistance to HIV-1, the World Health Organization (WHO) recommends that regular surveys are conducted. This study's objective was to assess the frequency of HIV-1 antiretroviral drug resistance in patients initiating antiretroviral treatment (ART) in the public sector throughout South Africa. METHODS: A prospective cross-sectional survey was conducted using probability proportional to size sampling...
2016: PloS One
https://www.readbyqxmd.com/read/27906685/targeted-chimera-delivery-to-ovarian-cancer-cells-by-heterogeneous-gold-magnetic-nanoparticle
#5
Yao Chen, Mengjiao Xu, Yi Guo, Keyao Tu, Weimin Wu, Jianjun Wang, Xiaowen Tong, Wenjuan Wu, Lifeng Qi, Donglu Shi
Efficient delivery of small interfering RNAs (siRNAs) to the targeted cells has remained a significant challenge in clinical applications. In the present study, we developed a novel aptamer-siRNA chimera delivery system mediated by cationic Au-Fe3O4 nanoparticles (NPs). The chimera constructed by VEGF RNA aptamer and Notch3 siRNA was bonded with heterogeneous Au-Fe3O4 nanoparticles by electrostatic interaction. The obtained complex exhibited much higher silencing efficiency against Notch3 gene compared with chimera alone and lipofectamine-siRNA complex, and improved the antitumor effects of the loaded chimera...
December 1, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27906650/structure-of-the-70s-ribosome-from-human-pathogen-staphylococcus-aureus
#6
Iskander Khusainov, Quentin Vicens, Anthony Bochler, François Grosse, Alexander Myasnikov, Jean-François Ménétret, Johana Chicher, Stefano Marzi, Pascale Romby, Gulnara Yusupova, Marat Yusupov, Yaser Hashem
Comparative structural studies of ribosomes from various organisms keep offering exciting insights on how species-specific or environment-related structural features of ribosomes may impact translation specificity and its regulation. Although the importance of such features may be less obvious within more closely related organisms, their existence could account for vital yet species-specific mechanisms of translation regulation that would involve stalling, cell survival and antibiotic resistance. Here, we present the first full 70S ribosome structure from Staphylococcus aureus, a Gram-positive pathogenic bacterium, solved by cryo-electron microscopy...
October 18, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27906136/rapid-synthesis-of-silver-nanoparticles-by-pseudomonas-stutzeri-isolated-from-textile-soil-under-optimised-conditions-and-evaluation-of-their-antimicrobial-and-cytotoxicity-properties
#7
Nishant Rajora, Sanket Kaushik, Anupam Jyoti, Shanker L Kothari
Present study utilised textile soil isolated bacterium Pseudomonas stutzeri to synthesise extracellular silver nanoparticles (AgNPs) under optimised conditions. The synthesised AgNPs were characterised using ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). Optimisation showed AgNPs synthesis within 8 h using 2mM Ag nitrate at pH9, temperature 80°C and maximum absorbance toward 400 nm. TEM analysis revealed spherical shape AgNPs and reduction in size upto 8 nm was observed under optimised conditions...
December 2016: IET Nanobiotechnology
https://www.readbyqxmd.com/read/27906059/a-mitochondrial-hsp70-hspa9b-is-linked-to-miltefosine-resistance-and-stress-response-in-leishmania-donovani
#8
P Vacchina, B Norris-Mullins, E S Carlson, M A Morales
BACKGROUND: Protozoan parasites of the genus Leishmania are responsible for leishmaniasis, a neglected tropical disease affecting millions worldwide. Visceral leishmaniasis (VL), caused by Leishmania donovani, is the most severe form of leishmaniasis with high rates of mortality if left untreated. Current treatments include pentavalent antimonials and amphotericin B. However, high toxicity and emergence of resistance hinder the success of these options. Miltefosine (HePC) is the first oral treatment available for leishmaniasis...
December 1, 2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27905624/-detection-of-the-meca-gene-in-coagulase-positive-staphylococcus-isolated-from-cats
#9
Nicolás Galarce, Loreto Muñoz, María Antonieta Jara, Paulo Lubí, Alejandra Sepúlveda, Sonia Anticevic
INTRODUCTION: Bacterial resistance is a global concern for public health. Reports of antimicrobial resistance, including that against methicillin, have increased in strains of coagulase positive Staphylococcus (CPS) isolated from pets, however in Chile this information is limited. OBJECTIVES: To determine the antimicrobial susceptibility profiles and to detect the mecA gene in CPS strains isolated from cats in Chile. MATERIALS AND METHODS: 134 samples were obtained from healthy cats and cats with skin lesions...
August 2016: Revista Chilena de Infectología: órgano Oficial de la Sociedad Chilena de Infectología
https://www.readbyqxmd.com/read/27902427/phenotypic-and-genetic-characterization-of-multi-drug-resistant-staphylococcus-aureus-in-the-tropics-of-southeast-asia
#10
Siti Norayuni Mohd Zulkeflle, Yus Amira Yusaimi, Norio Sugiura, Koji Iwamoto, Masafumi Goto, Motoo Utsumi, Nor'azizi Bin Othman, Zuriati Zakaria, Hirofumi Hara
Antibiotic resistance has become a major public health problem throughout the world. The presence of antibiotic resistant bacteria such as Staphylococcus aureus (S. aureus) and antibiotic resistance genes (ARGs) in hospital wastewater is cause for great concern today. In this study, 276 S. aureus isolates were recovered from hospital wastewater samples in Malaysia. All of the isolates were screened for susceptibility to nine different classes of antibiotics: ampicillin (AMP), ciprofloxacin (CFX), gentamicin (GMN), kanamycin (KMN), erythromycin (ERM), vancomycin (VAN), trimetoprim and sulfamethaxazole (TM-SMZ), chloramphenicol (CMP), tetracycline (TET), and nalidixic acid (NAL)...
November 3, 2016: Microbiology
https://www.readbyqxmd.com/read/27902396/determination-of-antimicrobial-resistance-of-enterococcus-strains-isolated-from-pigs-and-their-genotypic-characterization-by-method-of-amplification-of-dna-fragments-surrounding-rare-restriction-sites-the-adsrrs-fingerprinting
#11
Aneta Nowakiewicz, Grażyna Ziółkowska, Aleksandra Trościańczyk, Przemysław Zięba, Sebastian Gnat
In this study, we analysed phenotypic resistance profiles and their reflection in the genomic profiles of Enterococcus spp. strains isolated from pigs raised on different farms. Samples were collected from five pig farms (n=90 animals) and tested for Enterococcus. Minimum inhibitory concentrations of 12 antimicrobials were determined using the broth microdilution method, and epidemiological molecular analysis of strains belonging to selected species (E. faecalis, E. faecium and E. hirae) was performed using the ADSRRS-fingerprinting method with a few modifications...
November 28, 2016: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/27902392/microbiological-sentinel-events-at-neurological-hospital-a-retrospective-cohort-study
#12
Annalia Asti, Elio Marmondi, Carmine Tinelli, Marta Corbella, Annalisa de Silvestri, Gaetano Bernardi, Franco Andreini, Anna Preti, Monica Bricchi
AbstractThe purpose of this study is to describe the epidemiological surveillance of microbiological sentinel events (SE) carried out between 2012-2014 at the Neurological Hospital Carlo Besta, Milano, Italy. The Setting is inpatient care with Multi- Drug-Resistance infections. The aim of the procedure is to formalize the management mode, the reporting and transmission of SE. Categorical variables were described by counts and percentages, those quantitatives as mean and standard deviation or median and interquartile range...
October 20, 2016: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/27902389/antimicrobial-susceptibility-to-azithromycin-among-salmonella-enterica-typhi-and-paratyphi-a-isolates-from-india
#13
Richa Misra, Kashi N Prasad
Decreased ciprofloxacin susceptibility (DCS) and multi-drug resistance (MDR) in typhoidal Salmonella isolates in areas of endemicity is a significant therapeutic problem. Guidelines for azithromycin disk diffusion and minimal inhibitory concentration (MIC) interpretive criteria for Salmonella enterica serovar Typhi were published recently by CLSI in 2015.We investigated the antimicrobial susceptibility pattern of azithromycin in 100 isolates of Salmonella Typhi (n=80), Paratyphi A (n=18) and B (n=2) recovered from blood stream infections from January 2013 to December 2015...
November 10, 2016: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/27900108/high-dose-chemotherapy-with-autologous-peripheral-blood-stem-cell-transplantation-for-choriocarcinoma-a-case-report-and-literature-review
#14
Eiko Yamamoto, Kaoru Niimi, Kayo Fujikake, Tetsuya Nishida, Makoto Murata, Ayako Mitsuma, Yuichi Ando, Fumitaka Kikkawa
Choriocarcinoma is a malignant gestational trophoblastic neoplasia (GTN) and one of the curable types of gynecological cancer. However, 10% of choriocarcinoma patients have a poor prognosis, particularly when they have metastasis, apart from pulmonary metastasis, or do not go into remission by the second chemotherapeutic regimen. We herein present the case of a 36-year-old patient who had choriocarcinoma with metastases to the lungs, liver and kidneys. The 5th and 6th regimens with cisplatin for choriocarcinoma failed and the patient developed brain metastases...
November 2016: Molecular and Clinical Oncology
https://www.readbyqxmd.com/read/27896297/a-mouse-model-of-multi-drug-resistant-staphylococcus-aureus-induced-ocular-disease
#15
Nicole M Broekema, Inna V Larsen, Erika S Naruzawa, Marcin Filutowicz, Aaron W Kolb, Leandro B C Teixeira, Curtis R Brandt
Staphylococcus aureus infection of the cornea is a significant threat to vision. The percentage of bacterial isolates resistant to antibiotics is increasing as is the percentage of infections caused by methicillin resistant isolates. There is a critical need for additional therapeutic approaches and their development will require the use of animal models to test efficacy. Two mouse models of S. aureus keratitis have been described but only quantified stromal keratitis (corneal clouding and perforation). We have extended these models using the methicillin resistant S...
November 2016: Journal of Ocular Biology
https://www.readbyqxmd.com/read/27895857/frequency-of-vana-vanb-and-vanh-variants-amongst-vancomycin-resistant-enterococci-isolated-from-patients-in-central-region-of-iran
#16
Jaafar Rezvani, Reza Nasr, Fatemeh T Shamsabadi, Mohammad Reza Akbari Eidgahi
AIM: The aim of this study was to investigate the VRE frequency and the rate of each gene in isolated enterococci from patients with intestinal infection in the central region of Iran. BACKGROUND: Enterococci infections are a public health growing concern due to the glycopeptide antibiotics resistance especially vancomycin. Genes, vanA, B, and H contribute to the influence of vancomycin-resistant enterococci (VRE). PATIENTS AND METHODS: This study was conducted from January to July 2014 in Shahrood university hospital...
2016: Gastroenterology and Hepatology From Bed to Bench
https://www.readbyqxmd.com/read/27895634/cytosolic-proteome-profiling-of-aminoglycosides-resistant-mycobacterium-tuberculosis-clinical-isolates-using-maldi-tof-ms
#17
Divakar Sharma, Manju Lata, Rananjay Singh, Nirmala Deo, Krishnamurthy Venkatesan, Deepa Bisht
Emergence of extensively drug resistant tuberculosis (XDR-TB) is the consequence of the failure of second line TB treatment. Aminoglycosides are the important second line anti-TB drugs used to treat the multi drug resistant tuberculosis (MDR-TB). Main known mechanism of action of aminoglycosides is to inhibit the protein synthesis by inhibiting the normal functioning of ribosome. Primary target of aminoglycosides are the ribosomal RNA and its associated proteins. Various mechanisms have been proposed for aminoglycosides resistance but still some are unsolved...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27894749/the-microbiology-of-diabetic-foot-infections-in-patients-recently-treated-with-antibiotic-therapy-a-prospective-study-from-india
#18
Ashu Rastogi, Suja Sukumar, Abhishek Hajela, Soham Mukherjee, Pinaki Dutta, Sanjay Kumar Bhadada, Anil Bhansali
AIM: Clinicians often treat clinically infected diabetic foot ulcers without information from cultures of the wound. The results of wound cultures may also be affected by previous antibiotic therapy. Thus, we aimed to study the microbial isolates, and antimicrobial sensitivity of previously treated patients with a clinically infected DFU. RESEARCH DESIGN AND METHODS: 293 consecutive patients with clinically infected DFU on prior antimicrobial treatment within the immediate past few days for a duration greater than one week were evaluated for microbial etiology, antibiotic sensitivity and final outcomes...
November 9, 2016: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/27894288/bactericidal-and-antioxidant-properties-of-essential-oils-from-the-fruits-dennettia-tripetala-g-baker
#19
Sunday O Okoh, Benson C Iweriegbor, Omobola O Okoh, Uchechukwu U Nwodo, Anthony I Okoh
BACKGROUND: The antibacterial and antioxidant properties of the essential oils (EOs) of unripe and ripe fruits of Dennettia tripetala and their potential for the management of infectious and oxidative-stress diseases were investigated in-vitro in this study. METHOD: Essential oil obtained from the fruit in Clevenger modified apparatus, was characterized by high resolution GC-MS, while antioxidant and antibacterial properties were tested by spectrophotometric and agar diffusion methods respectively...
November 28, 2016: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/27894259/genomic-signatures-of-mannheimia-haemolytica-that-associate-with-the-lungs-of-cattle-with-respiratory-disease-an-integrative-conjugative-element-and-antibiotic-resistance-genes
#20
Michael L Clawson, Robert W Murray, Michael T Sweeney, Michael D Apley, Keith D DeDonder, Sarah F Capik, Robert L Larson, Brian V Lubbers, Brad J White, Theodore S Kalbfleisch, Gennie Schuller, Aaron M Dickey, Gregory P Harhay, Michael P Heaton, Carol G Chitko-McKown, Dayna M Brichta-Harhay, James L Bono, Timothy P L Smith
BACKGROUND: Mannheimia haemolytica typically resides in cattle as a commensal member of the upper respiratory tract microbiome. However, some strains can invade their lungs and cause respiratory disease and death, including those with multi-drug resistance. A nucleotide polymorphism typing system was developed for M. haemolytica from the genome sequences of 1133 North American isolates, and used to identify genetic differences between isolates from the lungs and upper respiratory tract of cattle with and without clinical signs of respiratory disease...
November 29, 2016: BMC Genomics
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