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https://www.readbyqxmd.com/read/28930004/enteric-infections-circulating-during-hajj-seasons-2011-2013
#1
Moataz Abd El Ghany, Mona Alsomali, Malak Almasri, Eriko Padron Regalado, Raeece Naeem, AbdulHafeez Tukestani, Abdullah Asiri, Grant A Hill-Cawthorne, Arnab Pain, Ziad A Memish
Hajj, the annual Muslim pilgrimage to Mecca, Saudi Arabia, is a unique mass gathering event that raises public health concerns in the host country and globally. Although gastroenteritis and diarrhea are common among Hajj pilgrims, the microbial etiologies of these infections are unknown. We collected 544 fecal samples from pilgrims with medically attended diarrheal illness from 40 countries during the 2011-2013 Hajj seasons and screened the samples for 16 pathogens commonly associated with diarrheal infections...
October 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28922838/comparative-genomics-of-a-drug-resistant-pseudomonas-aeruginosa-panel-and-the-challenges-of-antimicrobial-resistance-prediction-from-genomes
#2
J Jeukens, I Kukavica-Ibrulj, J G Emond-Rheault, L Freschi, R C Levesque
Antimicrobial resistance (AMR) is now recognized as a global threat to human health. The accessibility of microbial whole-genome sequencing offers an invaluable opportunity for resistance surveillance via the resistome, i.e. the genes and mutations underlying AMR. Unfortunately, AMR prediction from genomic data remains extremely challenging, especially for species with a large pan-genome. One such organism, for which multidrug-resistant (MDR) isolates are frequently encountered in the clinic, is Pseudomonas aeruginosa...
October 2, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28922811/a-programme-to-create-short-course-chemotherapy-for-pulmonary-mycobacterium-avium-disease-based-on-pharmacokinetics-pharmacodynamics-and-mathematical-forecasting
#3
Devyani Deshpande, Shashikant Srivastava, Tawanda Gumbo
Objectives: Pulmonary Mycobacterium avium complex (MAC) prevalence is on the rise worldwide. The average therapy duration is 1.5 years, which is associated with poor cure rates. Our objective was to develop a programme to design a combination therapy regimen for pulmonary MAC to be administered for 6 months or less with efficacy in > 90% of patients. Methods: We performed a literature search for the following MeSH headings 'Mycobacterium avium' AND 'pharmacokinetics/pharmacodynamics' in PubMed up to 2016...
September 1, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28922805/failure-of-the-azithromycin-and-ethambutol-combination-regimen-in-the-hollow-fibre-system-model-of-pulmonary-mycobacterium-avium-infection-is-due-to-acquired-resistance
#4
Shashikant Srivastava, Devyani Deshpande, Tawanda Gumbo
Objectives: To investigate the performance of the two backbone drugs in the standard combination therapy regimen in the hollow-fibre system (HFS) model of pulmonary Mycobacterium avium complex (MAC) infection. Methods: Six HFS were inoculated with human-derived monocytes infected with MAC, and treated with 15 mg/kg of ethambutol and 500 mg of azithromycin daily for 28 days to recapitulate the concentration-time profiles seen in the lungs of humans treated with these drugs and doses...
September 1, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28916560/cmeabc-multidrug-efflux-pump-contributes-to-antibiotic-resistance-and-promotes-campylobacter-jejuni-survival-and-multiplication-in-acanthamoeba-polyphaga
#5
Ana Vieira, Amritha Ramesh, Alan M Seddon, Andrey V Karlyshev
Campylobacter jejuni is a foodborne pathogen recognized as the leading cause of human bacterial gastroenteritis. The wide use of antibiotics in medicine and in animal husbandry has led to an increased incidence of antibiotic resistance in Campylobacter In addition to a role in multidrug resistance, the Campylobacter CmeABC RND-type efflux pump, which is associated with multidrug resistance (MDR), may also be involved in virulence. As a vehicle of pathogenic microorganisms, the protozoan Acanthamoeba is a good model for the investigation of bacterial survival in the environment and molecular mechanisms of pathogenicity...
September 15, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28912103/membrane-perturbing-activities-and-structural-properties-of-the-frog-skin-derived-peptide-esculentin-1a-1-21-nh2-and-its-diastereomer-esc-1-21-1c-correlation-with-their-antipseudomonal-and-cytotoxic-activity
#6
Maria Rosa Loffredo, Anirban Ghosh, Nicole Harmouche, Bruno Casciaro, Vincenzo Luca, Annalisa Bortolotti, Floriana Cappiello, Lorenzo Stella, Anirban Bhunia, Burkhard Bechinger, Maria Luisa Mangoni
Antimicrobial peptides (AMPs) represent new alternatives to cope with the increasing number of multi-drug resistant microbial infections. Recently, a derivative of the frog-skin AMP esculentin-1a, Esc(1-21), was found to rapidly kill both the planktonic and biofilm forms of the Gram-negative bacterium Pseudomonas aeruginosa with a membrane-perturbing activity as a plausible mode of action. Lately, its diastereomer Esc(1-21)-1c containing two d-amino acids i.e. (D)Leu14 and (D)Ser17 revealed to be less cytotoxic, more stable to proteolytic degradation and more efficient in eradicating Pseudomonas biofilm...
September 11, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28904315/microbiological-assessment-of-effects-of-clinical-mouth-rinses-on-common-oral-microbes
#7
Taiji Ogawa, Mariko Honda-Ogawa, Kazunori Ikebe, Shigetada Kawabata, Yoshinobu Maeda
Dry mouth occurs frequently in aged individuals, as well as in patients who are hospitalized, receiving multiple drugs, undergoing radiation treatment to the head and neck, or wearing a removable denture prosthesis, use of mouth rinse being often an option for relief. In the present study, we performed microbiological assessments of subjects given three different commercially available mouth rinses commonly employed in clinical practice (Peptisal, Biotène, ConCool) to determine their effects. For bacterial clearance in vitro, Peptisal showed the highest level of suppression of oral indigenous bacteria found in both planktonic formations and biofilm...
2017: Journal of Oral Science
https://www.readbyqxmd.com/read/28901763/bioassay-guided-isolation-of-antibacterial-metabolites-from-emericella-sp-tj29
#8
Yan He, Zhengxi Hu, Qin Li, Jinfeng Huang, Xiao-Nian Li, Hucheng Zhu, Junjun Liu, Jianping Wang, Yongbo Xue, Yonghui Zhang
Bioassay-guided isolation of metabolites from cultures of the plant-derived fungus Emericella sp. TJ29 yielded three new terpene-polyketide hybrid meroterpenoids, emervaridones A-C (1-3), two new polyketides, varioxiranediols A and B (5 and 6), and three known analogues (4, 7, and 8). The structures and absolute configurations of these new compounds were elucidated by spectroscopic analyses, single-crystal X-ray diffraction, Mo2(OAc)4-induced electronic circular dichroism (ECD) data, and ECD calculations. To date, only one compound (4) bearing the emervaridone-type carbocyclic skeleton has been reported...
September 13, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28894103/the-candida-albicans-transcription-factor-cas5-couples-stress-responses-drug-resistance-and-cell-cycle-regulation
#9
Jinglin L Xie, Longguang Qin, Zhengqiang Miao, Ben T Grys, Jacinto De La Cruz Diaz, Kenneth Ting, Jonathan R Krieger, Jiefei Tong, Kaeling Tan, Michelle D Leach, Troy Ketela, Michael F Moran, Damian J Krysan, Charles Boone, Brenda J Andrews, Anna Selmecki, Koon Ho Wong, Nicole Robbins, Leah E Cowen
The capacity to coordinate environmental sensing with initiation of cellular responses underpins microbial survival and is crucial for virulence and stress responses in microbial pathogens. Here we define circuitry that enables the fungal pathogen Candida albicans to couple cell cycle dynamics with responses to cell wall stress induced by echinocandins, a front-line class of antifungal drugs. We discover that the C. albicans transcription factor Cas5 is crucial for proper cell cycle dynamics and responses to echinocandins, which inhibit β-1,3-glucan synthesis...
September 11, 2017: Nature Communications
https://www.readbyqxmd.com/read/28893777/modulation-of-staphylococcus-aureus-response-to-antimicrobials-by-the-candida-albicans-quorum-sensing-molecule-farnesol
#10
Eric F Kong, Christina Tsui, Sona Kucharíková, Patrick Van Dijck, Mary Ann Jabra-Rizk
In microbial biofilms, microorganisms utilize secreted signaling chemical molecules to coordinate their collective behavior. Farnesol is a quorum-sensing molecule secreted by the fungal species Candida albicans, shown to play a central physiological role during fungal biofilm growth. Our pervious in vitro and in vivo studies characterized an intricate interaction between C. albicans and the bacterial pathogen Staphylococcus aureus, as these species co-exist in biofilm. In this study, we aimed to investigate the impact of farnesol on S...
September 11, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28891372/controversies-and-advances-in-the-management-of-ventilator-associated-pneumonia
#11
Katherine L Roberts, Marin H Kollef, Scott T Micek, Paul Juang
Although national surveillance data suggests that the incidence of ventilator associated pneumonia (VAP) is down-trending, it remains one of the most commonly encountered hospital acquired infections in the United States and worldwide. Its association with increased healthcare costs and worsened patient outcomes warrants continued effort to improve the care of patients with VAP. Areas covered: The increasing prevalence of multi-drug resistant bacteria further drives the need to explore advances in diagnostic and treatment options...
September 11, 2017: Expert Review of Respiratory Medicine
https://www.readbyqxmd.com/read/28886559/sewage-treatment-effluents-in-delhi-a-key-contributor-of-%C3%AE-lactam-resistant-bacteria-and-genes-to-the-environment
#12
Manisha Lamba, Shaikh Ziauddin Ahammad
Rapid emergence of antibiotic resistance (AR) in developing countries is posing a greater health risk and increasing the global disease burden. Lack of access to safe drinking water, poor sanitation and inadequate sewage treatment facilities in these countries are fueling the problem associated with emergence of AR. Rapid proliferation of AR mediated by treated and untreated discharges from sewage treatment plants (STPs) is a prime public health concern. This study aims to understand the occurrence, fate, and routes of proliferation of carbapenem (KPC) and extended spectrum β-lactam (ESBL) resistant bacteria, and selected resistant genes in the samples collected from different unit operations in 12 STPs in New Delhi over two seasons...
August 28, 2017: Chemosphere
https://www.readbyqxmd.com/read/28882639/effects-of-residual-levels-of-tetracycline-on-the-barrier-functions-of-human-intestinal-epithelial-cells
#13
Kuppan Gokulan, Carl E Cerniglia, Charles Thomas, Silvia A Pineiro, Sangeeta Khare
Tetracyclines are frequently used in food-producing animals to treat, control, and prevent microbial diseases. Concerns are raised regarding the effects of residual levels of tetracycline, which may be present in the food supply, for emergence of drug-resistance and transfer of antibiotic-resistance gene in intestinal microbiota. In contrast, no information is available regarding the possible effects of residual tetracycline on the gastrointestinal epithelial layer barrier-disruption. This study investigates the outcome of tetracycline treatment on intestinal epithelial cells integrity...
September 4, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28878747/in-vitro-antibacterial-activity-of-unconjugated-and-conjugated-bile-salts-on-staphylococcus-aureus
#14
Thippeswamy H Sannasiddappa, Peter A Lund, Simon R Clarke
Bile salts are potent antimicrobial agents and are an important component of innate defenses in the intestine, giving protection against invasive organisms. They play an important role in determining microbial ecology of the intestine and alterations in their levels can lead to increased colonization by pathogens. We have previously demonstrated survival of the opportunistic pathogen Staphylococcus aureus in the human colonic model. Thus investigating the interaction between S. aureus and bile salts is an important factor in understanding its ability to colonize in the host intestine...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28878746/inhibition-of-new-delhi-metallo-%C3%AE-lactamase-1-ndm-1-producing-escherichia-coli-ir-6-by-selected-plant-extracts-and-their-synergistic-actions-with-antibiotics
#15
Brinda Chandar, Sundar Poovitha, Kaliappan Ilango, Ramasamy MohanKumar, Madasamy Parani
Improper use of antibiotics has led to a great concern in the development of pathogenic microbial resistance. New Delhi metallo-β-lactamase 1 (NDM-1) producing bacteria are resistant to most of the β-lactam antibiotics, and so far, no new compounds have been clinically tested against these bacteria. In this study, ethanol extracts from the leaves of 240 medicinal plant species were screened for antibacterial activity against an NDM-1 Escherichia coli strain. The extracts that showed antibacterial activity were then tested for minimum inhibitory concentrations (MICs) and zones of inhibition...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28873001/toward-the-drug-factory-microbiome-microbial-community-variations-in-antibiotic-producing-clean-rooms
#16
Amal M Hamdy, Moamen El-Massry, Mona T Kashef, Magdy A Amin, Ramy K Aziz
Microbiome projects are currently booming around the globe, enabled by advances in culture-independent microbial community analysis and high-throughput sequencing. One emerging application of microbiome science involves exploring microbial diversity in built environments, and one unexplored built environment is the pharmaceutical factory, notably factories producing antibiotics, as they could be enriched in antibiotic-resistant microbes. To examine the drug factory microbiome, we launched this interdisciplinary hypothesis-generating study to benchmark culture-independent microbiome analysis in drug manufacturing units producing antibiotics and nonantibiotic drugs, against traditional microbial identification and quantification techniques...
September 5, 2017: Omics: a Journal of Integrative Biology
https://www.readbyqxmd.com/read/28870074/exhaled-volatile-organic-compounds-of-infection-a-systematic-review
#17
Waqar M Ahmed, Oluwasola Lawal, Tamara M Nijsen, Royston Goodacre, Stephen J Fowler
With heightened global concern of microbial drug resistance, advanced methods for early and accurate diagnosis of infection are urgently needed. Analysis of exhaled breath volatile organic compounds (VOCs) toward detecting microbial infection potentially allows a highly informative and noninvasive alternative to current genomics and culture-based methods. We performed a systematic review of research literature reporting human and animal exhaled breath VOCs related to microbial infections. In this Review, we find that a wide range of breath sampling and analysis methods are used by researchers, which significantly affects interstudy method comparability...
September 13, 2017: ACS Infectious Diseases
https://www.readbyqxmd.com/read/28869568/medicinal-plants-based-products-tested-on-pathogens-isolated-from-mastitis-milk
#18
Claudia Pașca, Liviu Mărghitaș, Daniel Dezmirean, Otilia Bobiș, Victorița Bonta, Flore Chirilă, Ioana Matei, Nicodim Fiț
Bovine mastitis a major disease that is commonly associated with bacterial infection. The common treatment is with antibiotics administered intramammary into infected quarters of the udder. The excessive use of antibiotics leads to multidrug resistance and associated risks for human health. In this context, the search for alternative drugs based on plants has become a priority in livestock medicine. These products have a low manufacturing cost and no reports of antimicrobial resistance to these have been documented...
September 4, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28869082/development-of-botanicals-to-combat-antibiotic-resistance
#19
REVIEW
Pooja D Gupta, Tannaz J Birdi
The discovery of antibiotics in the previous century lead to reduction in mortality and morbidity due to infectious diseases but their inappropriate and irrational use has resulted in emergence of resistant microbial populations. Alteration of target sites, active efflux of drugs and enzymatic degradations are the strategies employed by the pathogenic bacteria to develop intrinsic resistance to antibiotics. This has led to an increased interest in medicinal plants since 25-50% of current pharmaceuticals are plant derived...
August 30, 2017: Journal of Ayurveda and Integrative Medicine
https://www.readbyqxmd.com/read/28867635/effect-of-human-placental-extract-in-the-management-of-biofilm-mediated-drug-resistance-a-focus-on-wound-management
#20
Sutapa Goswami, Ratul Sarkar, Pritam Saha, Amit Maity, Tridib Sarkar, Debmalya Das, Piyali Datta Chakraborty, Subhasri Bandyopadhyay, Chandan Kumar Ghosh, Sanmoy Karmakar, Tuhinadri Sen
Management of infectious wounds, particularly chronic wounds and burn injuries, is a matter of global concern. Worldwide estimates reveal that, billions of dollars are being spent annually for the management of such chronic ailments. Evidently, bacterial biofilms pose a greater problem in the effective management of infection in chronic wounds, since most of the currently available antibiotics are unable to act on the microorganisms residing inside the protected environment of the biofilms. Accordingly, in the present study, we have attempted to evaluate the anti-biofilm properties of human placental extract (PLX) and also other virulence factors that are mediated via the quorum sensing (QS) signalling system...
September 1, 2017: Microbial Pathogenesis
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