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antibiotics resistance

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https://www.readbyqxmd.com/read/28742861/targeting-the-permeability-barrier-and-peptidoglycan-recycling-pathways-to-disarm-pseudomonas-aeruginosa-against-the-innate-immune-system
#1
Gabriel Torrens, Marcelo Pérez-Gallego, Bartolomé Moya, Marta Munar-Bestard, Laura Zamorano, Gabriel Cabot, Jesús Blázquez, Juan A Ayala, Antonio Oliver, Carlos Juan
Antimicrobial resistance is a continuously increasing threat that severely compromises our antibiotic arsenal and causes thousands of deaths due to hospital-acquired infections by pathogens such as Pseudomonas aeruginosa, situation further aggravated by the limited development of new antibiotics. Thus, alternative strategies such as those targeting bacterial resistance mechanisms, virulence or potentiating the activity of our immune system resources are urgently needed. We have recently shown that mutations simultaneously causing the peptidoglycan recycling blockage and the β-lactamase AmpC overexpression impair the virulence of P...
2017: PloS One
https://www.readbyqxmd.com/read/28742812/broad-range-lytic-bacteriophages-that-kill-staphylococcus-aureus-local-field-strains
#2
Virginia Abatángelo, Natalia Peressutti Bacci, Carina A Boncompain, Ariel A Amadio, Soledad Carrasco, Cristian A Suárez, Héctor R Morbidoni
Staphylococcus aureus is a very successful opportunistic pathogen capable of causing a variety of diseases ranging from mild skin infections to life-threatening sepsis, meningitis and pneumonia. Its ability to display numerous virulence mechanisms matches its skill to display resistance to several antibiotics, including β-lactams, underscoring the fact that new anti-S. aureus drugs are urgently required. In this scenario, the utilization of lytic bacteriophages that kill bacteria in a genus -or even species- specific way, has become an attractive field of study...
2017: PloS One
https://www.readbyqxmd.com/read/28742382/occurrence-and-antibiotic-susceptibility-of-listeria-species-and-staphylococcus-aureus-in-cattle-slaughterhouses-of-kerala-south-india
#3
Tanuja K G M Gowda, Latha C, Sunil B, Inge Van Damme
A total of 765 samples were collected from beef carcasses, knives, cutting table surfaces, beef, hands, air, and water from four cattle slaughterhouses of Kerala, South India, to determine the occurrence and antibiotic susceptibility of Listeria species and Staphylococcus aureus. Listeria spp. were isolated from beef carcasses (2.0%), knives (3.7%), cutting table surfaces (1.9%), beef (0.7%), and water (1.3%). The identified species were Listeria monocytogenes (0.1%), Listeria innocua (0.9%), and Listeria ivanovii (0...
July 25, 2017: Foodborne Pathogens and Disease
https://www.readbyqxmd.com/read/28742284/aquatic-animals-promote-antibiotic-resistance-gene-dissemination-in-water-via-conjugation-role-of-different-regions-within-the-zebra-fish-intestinal-tract-and-impact-on-fish-intestinal-microbiota
#4
Jialun Fu, Dong Yang, Min Jin, Weili Liu, Xin Zhao, Chenyu Li, Tianyu Zhao, Jingfeng Wang, Zhixian Gao, Zhiqiang Shen, Zhigang Qiu, Jun-Wen Li
The aqueous environment is one of many reservoirs of antibiotic resistance genes (ARGs). Fish, as important aquatic animals which possess ideal intestinal niches for bacteria to grow and multiply, may ingest antibiotic resistance bacteria from aqueous environment. The fish gut would be a suitable environment for conjugal gene transfer including those encoding antibiotic resistance. However, little is known in relation to the impact of ingested ARGs or ARB on gut microbiota. Here, we applied the cultivation method, qPCR, nuclear molecular genetic marker and 16S rDNA amplicon sequencing technologies to develop a plasmid-mediated ARG transfer model of zebrafish...
July 25, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28742152/bacterial-size-matters-multiple-mechanisms-controlling-septum-cleavage-and-diplococcus-formation-are-critical-for-the-virulence-of-the-opportunistic-pathogen-enterococcus-faecalis
#5
Bartłomiej Salamaga, Tomasz K Prajsnar, Ana Jareño-Martinez, Joost Willemse, Martin A Bewley, Françoise Chau, Tassadit Ben Belkacem, Annemarie H Meijer, David H Dockrell, Stephen A Renshaw, Stéphane Mesnage
Enterococcus faecalis is an opportunistic pathogen frequently isolated in clinical settings. This organism is intrinsically resistant to several clinically relevant antibiotics and can transfer resistance to other pathogens. Although E. faecalis has emerged as a major nosocomial pathogen, the mechanisms underlying the virulence of this organism remain elusive. We studied the regulation of daughter cell separation during growth and explored the impact of this process on pathogenesis. We demonstrate that the activity of the AtlA peptidoglycan hydrolase, an enzyme dedicated to septum cleavage, is controlled by several mechanisms, including glycosylation and recognition of the peptidoglycan substrate...
July 24, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28742143/impact-of-rapid-identification-of-positive-blood-cultures-using-the-verigene-system-on-antibiotic-prescriptions-a-prospective-study-of-community-onset-bacteremia-in-a-tertiary-hospital-in-japan
#6
Kayoko Hayakawa, Kazuhisa Mezaki, Masao Kobayakawa, Kei Yamamoto, Yoshikazu Mutoh, Motoyuki Tsuboi, Takehiro Hasimoto, Maki Nagamatsu, Satoshi Kutsuna, Nozomi Takeshita, Yuichi Katanami, Masahiro Ishikane, Norio Ohmagari
BACKGROUND: Rapid identification of positive blood cultures is important for initiation of optimal treatment in septic patients. Effects of automated, microarray-based rapid identification systems on antibiotic prescription against community-onset bacteremia (COB) remain unclear. METHODS: We prospectively enrolled 177 patients with 185 COB episodes (occurring within 72 h of admission) over 17 months. Bacteremia episodes due to gram-positive bacteria (GP) and gram-negative bacteria (GN) in the same patient were counted separately...
2017: PloS One
https://www.readbyqxmd.com/read/28742023/genome-wide-identification-of-lineage-and-locus-specific-variation-associated-with-pneumococcal-carriage-duration
#7
John A Lees, Nicholas J Croucher, David Goldblatt, François Nosten, Julian Parkhill, Claudia Turner, Paul Turner, Stephen D Bentley
Streptococcus pneumoniae is a leading cause of invasive disease in infants, especially in low-income settings. Asymptomatic carriage in the nasopharynx is a prerequisite for disease, but variability in its duration is currently only understood at the serotype level. Here we developed a model to calculate the duration of carriage episodes from longitudinal swab data, and combined these results with whole genome sequence data. We estimated that pneumococcal genomic variation accounted for 63% of the phenotype variation, whereas the host traits considered here (age and previous carriage) accounted for less than 5%...
July 25, 2017: ELife
https://www.readbyqxmd.com/read/28741927/rapid-antibiotic-susceptibility-testing-of-uropathogenic-e-coli-by-tracking-sub-micron-scale-motion-of-single-bacterial-cells
#8
Karan Syal, Simon Shen, Yunze Yang, Shaopeng Wang, Shelley E Haydel, Nongjian Tao
To combat antibiotic resistance, a rapid antibiotic susceptibility testing (AST) technology that can identify resistant infections at disease onset is required. Current clinical AST technologies take 1-3 days, which is often too slow for accurate treatment. Here we demonstrate a rapid AST method by tracking sub-µm scale bacterial motion with an optical imaging and tracking technique. We apply the method to clinically relevant bacterial pathogens, Escherichia coli O157: H7 and uropathogenic E. coli (UPEC) loosely tethered to a glass surface...
July 25, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28741666/assessment-of-the-potential-of-the-multi-enzyme-producer-bacillus-amyloliquefaciens-us573-as-alternative-feed-additive
#9
Ameny Farhat-Khemakhem, Monia Blibech, Ines Boukhris, Mohamed Makni, Hichem Chouayekh
BACKGROUND: Recently, probiotics have increasingly been used as feed additives in poultry diets as an alternative to antibiotic growth promoters fostering resistance development. RESULTS: This study was aimed at assessing the potential of Bacillus amyloliquefaciens US573 as a direct-fed microbial. The US573 strain was found to be free of harmful enzymatic activities and sensitive to antibiotics. In addition, it showed a good acid and bovine bile tolerance, high adhesion efficacy to chicken enterocytes, and an ability to form biofilms, which may favor its survival and persistence in the animal gastrointestinal tract...
July 25, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28741188/-sexually-transmitted-infections-in-germany-the-current-epidemiological-situation
#10
Viviane Bremer, Sandra Dudareva-Vizule, Susanne Buder, Matthias An der Heiden, Klaus Jansen
Sexually transmitted infections (STIs) can impair sexual health. Surveillance and study data were used to provide an overview over STIs in Germany. We estimated 3900 new HIV diagnoses in 2015. Of newly diagnosed infections, 57% were attributed to men who have sex with men (MSM). It was further estimated that there were 3200 new HIV infections and 84,700 people living with HIV in 2015. A total of 6834 syphilis infections were recorded in 2015, which corresponds to an increase of 149% since 2009. The incidence in men was 16-times higher than in women...
July 24, 2017: Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz
https://www.readbyqxmd.com/read/28741151/probiotic-characteristics-of-lactobacillus-curvatus-dn317-a-strain-isolated-from-chicken-ceca
#11
Mohamed Zommiti, Nathalie Connil, Jeannette Ben Hamida, Mounir Ferchichi
The probiotic characteristics of Lactobacillus curvatus DN317, a strain isolated from chicken ceca, were evaluated. This strain was selected for study from the isolated Lactobacillus strains because it has specific anti-microbial activity against Campylobacter jejuni ATCC 33560, Camp. jejuni NCTC 11168, Listeria monocytogenes ATCC 7644, and Bacillus subtilis ATCC 8633. Lact. curvatus DN317 showed an auto-aggregation percentage of 72% and presented the highest co-aggregation with Lact. monocytogenes ATCC 7644 (68%) compared to B...
July 24, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28741095/phenotype-microarray-analysis-of-the-aders-two-component-system-in-acinetobacter-baumannii
#12
J-R Sun, Y-S Chiang, H-S Shang, C-L Perng, Y-S Yang, T-S Chiueh
Acinetobacter baumannii is a nosocomial pathogen capable of resistance to multiple antimicrobials. The AdeRS two-component system (TCS) is associated with antimicrobial resistance by controlling the AdeABC efflux pump. To elucidate modulation by AdeRS, we made an A. baumannii mutant lacking the AdeRS TCS and characterized it using phenotype microarray (PM) analysis. After disrupting the adeRS operon, lower expression of AdeABC efflux pump was observed in the mutant strain. PM analysis showed that the AdeRS deletion strain and parental strain presented different tolerances to 91 compounds...
July 24, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28740354/nosocomial-spontaneous-bacterial-peritonitis-antibiotic-treatment-in-the-era-of-multi-drug-resistance-pathogens-a-systematic-review
#13
Marco Fiore, Alberto Enrico Maraolo, Ivan Gentile, Guglielmo Borgia, Sebastiano Leone, Pasquale Sansone, Maria Beatrice Passavanti, Caterina Aurilio, Maria Caterina Pace
AIM: To systematically review literature upon aetiology of nosocomial spontaneous bacterial peritonitis (N-SBP) given the rising importance of multidrug-resistant (MDR) bacteria. METHODS: A literature search was performed on MEDLINE and Google Scholar databases from 2000 to 15(th) of November 2016, using the following search strategy: "spontaneous" AND "peritonitis". RESULTS: The initial search through electronic databases retrieved 2556 records...
July 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28739795/clinical-characteristics-and-treatment-outcomes-of-patients-with-acquired-macrolide-resistant-mycobacterium-abscessus-lung-disease
#14
Hayoung Choi, Su-Young Kim, Dae Hun Kim, Hee Jae Huh, Chang-Seok Ki, Nam Yong Lee, Seung-Heon Lee, Soyoun Shin, Sung Jae Shin, Charles L Daley, Won-Jung Koh
Macrolide antibiotics are mainstays in the treatment of lung disease due to the Mycobacterium abscessus complex. Although previous studies have reported development of acquired macrolide resistance in this species, limited data are available on the outcomes of lung disease due to macrolide-resistant M. abscessus subspecies abscessus (hereafter M. abscessus). This study evaluated the clinical features, treatment outcomes, and molecular characteristics of macrolide-resistant isolates of M. abscessus We performed a retrospective review of medical records and genetic analysis of clinical isolates from 13 patients who had acquired macrolide-resistant M...
July 24, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28739787/resistance-to-ceftazidime-avibactam-is-due-to-transposition-of-kpc-in-a-porin-deficient-strain-of-klebsiella-pneumoniae-with-increased-efflux-activity
#15
Kirk Nelson, Peera Hemarajata, Dongxu Sun, Debora Rubio-Aparicio, Ruslan Tsivkovski, Shangxin Yang, Robert Sebra, Andrew Kasarskis, Hoan Nguyen, Blake M Hanson, Shana Leopold, George Weinstock, Olga Lomovskaya, Romney M Humphries
Ceftazidime-avibactam is an antibiotic with activity against serine beta-lactamases, including KPC. Recently, reports have emerged of KPC-producing isolates resistant to this antibiotic, including a report of a wild-type KPC-3 producing sequence type 258 Klebsiella pneumoniae that was resistant to ceftazidime-avibactam. We describe a detailed analysis of this isolate, in the context of two other closely related KPC-3 producing isolates, recovered from the same patient. Both isolates encoded a non-functional OmpK35, whereas we demonstrate a novel T333N mutation in OmpK36, present in the ceftazidime-avibactam resistant isolate, reduced activity of this porin and impacted ceftazidime-avibactam susceptibility...
July 24, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28739786/benzoxazoles-phthalazinones-and-arylurea-based-compounds-with-impdh-independent-antibacterial-activity-against-francisella-tularensis
#16
Suresh Kumar Gorla, Yan Zhang, Meaghan M Rabideau, Aiping Qin, Shibin Chacko, Amanda L House, Corey R Johnson, Kavitha Mandapati, Hannah M Bernstein, Elizabeth S McKenney, Helena Boshoff, Minjia Zhang, Ian J Glomski, Joanna B Goldberg, Gregory D Cuny, Barbara J Mann, Lizbeth Hedstrom
Francisella tularensis is the causative agent of tularemia and a potential biowarfare agent. The virulence of F. tularensis is decreased by deletion of guaB, the gene encoding inosine monophosphate dehydrogenase (IMPDH), suggesting that this enzyme is a target for antibacterial design. Here we report that F. tularensis growth is blocked by inhibitors of bacterial IMPDHs. Seventeen compounds from two different frameworks, designated D and Q, display antibacterial activity with minimum inhibitory concentrations less than 1 μM...
July 24, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28739600/whole-genome-sequencing-and-concordance-between-antimicrobial-susceptibility-genotypes-and-phenotypes-of-bacterial-isolates-associated-with-bovine-respiratory-disease
#17
Joseph R Owen, Noelle Noyes, Amy E Young, Daniel J Prince, Patricia C Blanchard, Terry W Lehenbauer, Sharif S Aly, Jessica H Davis, Sean M O'Rourke, Zaid Abdo, Keith Belk, Michael R Miller, Paul Morley, Alison Van Eenennaam
Extended laboratory culture and antimicrobial susceptibility testing timelines hinder rapid species identification and susceptibility profiling of bacterial pathogens associated with bovine respiratory disease, the most prevalent cause of cattle mortality in the United States. Whole genome sequencing offers a culture-independent alternative to current bacterial identification methods but requires a library of bacterial reference genomes for comparison. To contribute new bacterial genome assemblies and evaluate genetic diversity and variation in antimicrobial resistance genotypes, whole-genome sequencing was performed on bovine respiratory disease associated bacterial isolates (Histophilus somni, Mycoplasma bovis, Mannheimia haemolytica, and Pasteurella multocida) from dairy and beef cattle...
July 24, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28738969/complex-chromosomal-neighborhood-effects-determine-the-adaptive-potential-of-a-gene-under-selection
#18
Magdalena Steinrueck, Călin C Guet
How the organization of genes on a chromosome shapes adaptation is essential for understanding evolutionary paths. Here, we investigate how adaptation to rapidly increasing levels of antibiotic depends on the chromosomal neighborhood of a drug-resistance gene inserted at different positions of the Escherichia coli chromosome. Using a dual-fluorescence reporter that allows us to distinguish gene amplifications from other up-mutations, we track in real-time adaptive changes in expression of the drug-resistance gene...
July 25, 2017: ELife
https://www.readbyqxmd.com/read/28738906/next-generation-sequencing-to-monitor-the-spread-of-antimicrobial-resistance
#19
Michael Otto
Next-generation sequencing is increasingly being used to monitor current and historic events related to the emergence and spread of antimicrobial resistance. In a recent publication, researchers analyzed the rise of methicillin-resistant Staphylococcus aureus in the 1960s, emphasizing that adaptations conferring antibiotic resistance might pre-date the introduction of novel antibiotic derivatives. Other researchers have evaluated the role of transmission within a healthcare network, using the example of extended-spectrum beta-lactamase-resistant Escherichia coli...
July 25, 2017: Genome Medicine
https://www.readbyqxmd.com/read/28738847/longitudinal-genomic-surveillance-of-multidrug-resistant-escherichia-coli-carriage-in-a-long-term-care-facility-in-the-united-kingdom
#20
Hayley J Brodrick, Kathy E Raven, Teemu Kallonen, Dorota Jamrozy, Beth Blane, Nicholas M Brown, Veronique Martin, M Estée Török, Julian Parkhill, Sharon J Peacock
BACKGROUND: Residents of long-term care facilities (LTCF) may have high carriage rates of multidrug-resistant pathogens, but are not currently included in surveillance programmes for antimicrobial resistance or healthcare-associated infections. Here, we describe the value derived from a longitudinal epidemiological and genomic surveillance study of drug-resistant Escherichia coli in a LTCF in the United Kingdom (UK). METHODS: Forty-five of 90 (50%) residents were recruited and followed for six months in 2014...
July 25, 2017: Genome Medicine
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