scholarly journals Survival of antibacterial resistance microbes in hospital-generated recycled wastewater

2016 ◽  
Vol 14 (6) ◽  
pp. 942-949 ◽  
Author(s):  
Kumarasingam Kalaiselvi ◽  
Vincent Mangayarkarasi ◽  
Doraisami Balakrishnan ◽  
Vasudevan Chitraleka
Keyword(s):  
Pathogenic Bacteria ◽  
Tertiary Care ◽  
Hospital Environment ◽  
Effluent Treatment ◽  
Resistant Bacteria ◽  
Klebsiella Pneumonia ◽  
Hospital Wastewater ◽  
Recycled Water ◽  
Drug Resistant Bacteria ◽  
Wastewater Samples

Hospital wastewater has the potential to be a threat to the hospital environment as it can contain pathogenic bacteria that may facilitate the resistant nature of organisms within effluent or water treatment plants. The recycling of hospital wastewater should have good quality. This study was carried out to highlight the incidence of antibiotic resistant bacteria in hospital-generated recycled water. This study was conducted in a tertiary care teaching hospital during June 2013–June 2014. One hundred and forty wastewater samples were aseptically collected at different stages in the recycling plant. The samples were processed within 2 hours following standard procedures for identification of bacteria and the pathogenic bacteria were isolated. The mostly identified pathogens were Staphylococcus aureus (11.42%), Pseudomonas aeruginosa (9.28%), Enterococcus faecalis (10%) and Bacillus subtilis (8.57%) which were removed by treatment, but Escherichia coli (16.42%), Klebsiella pneumonia (8.57%), and Proteus mirabilis (11.42%) survived in the final sedimentation tank (lagoon) from where this water will be used for gardening purposes. An antibiogram study showed these pathogens were resistant to first-line antibiotics. Effluent treatment plants in hospitals should be monitored for the fulfillment of the guidelines and quality control of treated water to stop the emergence of multi-drug resistant bacteria in the hospital environment.

scholarly journals Synthesis, in vitro Antimicrobial Activity, and Docking Studies of some Pyrano[2,3-c] Pyrazole Derivatives

2021 ◽  
Vol 12 (4) ◽  
pp. 4705-4730
Keyword(s):  
In Silico ◽  
Public Health Problem ◽  
Multidrug Resistant ◽  
Docking Studies ◽  
Hospital Environment ◽  
Resistant Bacteria ◽  
Klebsiella Pneumonia ◽  
Drug Resistant Bacteria ◽  
Microbiological Methods

The hospital environment favors the circulation of drug-resistant bacteria. The researcher has oriented this public health problem to find an ideal tool for better patient management. Therefore, this study aims to assess the biological activity of some synthetic molecules against multidrug-resistant bacterial isolates from patients suspected of nosocomial infections. After synthesizing and characterizing five targeted compounds 5(a-e), a sensitivity test is carried out to screen their antibacterial activity via microbiological methods (diffusion and microdilution). The forgoing results confirmed that (5c) compound has better potential against all studied strains with a minimum inhibitory concentration (MIC) that varies between 6.25 - 50 mg/mL. The lowest MIC values were observed with Klebsiella pneumonia, while the greatest value of the same parameter was obtained with L. monocytogenes. On the other side, in silico pharmacological studies like ADME and docking data were implemented for the selected compounds 5(a-e) to comprehensively understand the plausible mode of interaction with the target. Docking results indicated that the compounds 5c and 5b have considerable binding energy towards the active site of Escherichia coli MurB and S. aureus DNA gyrase B. In vitro and in silico data have confirmed the antimicrobial potentials of the five synthetic compounds; this data can be added and supported the literature on the bioactivity of pyrano[2,3-c] pyrazole.

Reduction in Nosocomial Transmission of Drug-Resistant Bacteria After Introduction of an Alcohol-Based Handrub

2005 ◽  
Vol 26 (7) ◽  
pp. 650-653 ◽  
Author(s):  
Fred M. Gordin ◽  
Maureen E. Schultz ◽  
Ruth A Huber ◽  
Janet A. Gill
Keyword(s):  
Hand Hygiene ◽  
Inner City ◽  
Medical Center ◽  
Tertiary Care ◽  
Hospital Environment ◽  
Resistant Bacteria ◽  
Drug Resistant ◽  
Drug Resistant Bacteria ◽  
Tertiary Care Medical Center ◽  
Vancomycin Resistant

AbstractObjective:To assess quantitatively the clinical impact of using an alcohol-based handrub (ABHR) in the hospital environment, measuring impact as the incidence of new, nosocomial isolates of drug-resistant organisms.Design:An observational survey from 1998 to 2003 comparing the first 3 years of no ABHR use with the 3 years following, when an ABHR was provided for hand hygiene.Setting:An inner-city, tertiary-care medical center.Intervention:At baseline, an antimicrobial soap with 0.3% triclosan was provided for staff hand hygiene. The intervention was placement in all inpatient and all outpatient clinic rooms of wall-mounted dispensers of an ABHR with 62.5% ethyl alcohol. Data were collected on change in the incidence of three drug-resistant bacteria.Results:During the 6 years of the survey, all new, nosocomially acquired isolates of methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant Enterococcus (VRE), and Clostridium difficile-associated diarrhea were recorded. On comparison of the first 3 years with the final 3 years, there was a 21% decrease in new, nosocomially acquired MRSA (90 to 71 isolates per year; P = .01) and a 41% decrease in VRE (41 to 24 isolates per year; P < .001). The incidence of new isolates of C. difficile was essentially unchanged.Conclusion:In the 3 years following implementation of an ABHR, this hospital experienced the value of reductions in the incidence of nosocomially acquired drug-resistant bacteria. These reductions provide clinical validation of the recent CDC recommendation that ABHRs be the primary choice for hand decontamination. (Infect Control Hosp Epidemiol 2005;26:650-653)

scholarly journals Screening of active antimicrobial and biological enzymes of microbial isolated from soil in Thailand

2017 ◽  
Vol 10 (4) ◽  
pp. 73 ◽  
Author(s):  
Pannapa Powthong ◽  
Apichai Sripean ◽  
Pattra Suntornthiticharoen
Keyword(s):  
Pathogenic Bacteria ◽  
Soil Microorganisms ◽  
Extracellular Enzyme ◽  
Antimicrobial Activities ◽  
Lipase Production ◽  
Resistant Bacteria ◽  
Strong Activity ◽  
Preliminary Screening ◽  
Soil Microbial ◽  
Drug Resistant Bacteria

Objective: The objectives of this study were to isolate microorganisms and screen for potential antimicrobial activities from the soil. Methods: In this study, a total of 425 isolates were isolated from 100 soil samples. The preliminary screening for antimicrobial activities of these isolates was performed by modified cross-streak, agar diffusion, and modified icrodilution technique against 16 pathogenic bacteria and fungi.Results: In the anti-microbial activity, there were three isolates, namely, 277, 303, and 307 exhibited inhibitory activity against methicillin-resistantStaphylococcus aureus and Salmonella typhimurium respectively. This study also examined the various enzymes producing from soil microorganisms including chitinase, chitosanase, amylase, cellulose, caseinase, gelatinase, esterase, and lipase production of different selective media for 24 and 48hrs using the direct spot method. The results revealed that 28 isolates could produce various enzymes with strong activity. Most of them produced gelatinase (5.65%) and caseinase (5.18%). There were four isolates that produce broad-spectrum enzyme. In addition, the investigation of selectedmicroorganism identification showed that they can be divided into three groups: Burkholderia spp., Pseudomonas spp., and Rhodococcus spp.Conclusion: This study demonstrated that the microorganisms from soil are capable of producing potential, antibacterial, and bioactive enzymes.Keywords: Antimicrobial activity, Extracellular enzyme, Soil microbial, Drug-resistant bacteria.

scholarly journals Targeted-Antibacterial-Plasmids (TAPs) combining conjugation and CRISPR/Cas systems achieve strain-specific antibacterial activity

2020 ◽  
Author(s):  
Audrey Reuter ◽  
Cécile Hilpert ◽  
Annick Dedieu-Berne ◽  
Sophie Lematre ◽  
Erwan Gueguen ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Pathogenic Bacteria ◽  
Bacterial Species ◽  
Carbapenem Resistance ◽  
Double Strand Breaks ◽  
Resistant Bacteria ◽  
Innovative Strategy ◽  
Strand Breaks ◽  
Drug Resistant Bacteria

AbstractThe global emergence of drug-resistant bacteria leads to the loss of efficacy of our antibiotics arsenal and severely limits the success of currently available treatments. Here, we developed an innovative strategy based on Targeted-Antibacterial-Plasmids (TAPs) that use bacterial conjugation to deliver CRISPR/Cas systems exerting a strain-specific antibacterial activity. TAPs are highly versatile as they can be directed against any specific genomic or plasmid DNA using the custom algorithm (CSTB) that identifies appropriate targeting spacer sequences. We demonstrate the ability of TAPs to induce strain-selective killing by introducing lethal double strand breaks (DSBs) into the targeted genomes. TAPs directed against a plasmid-born carbapenem resistance gene efficiently resensitise the strain to the drug. This work represents an essential step towards the development of an alternative to antibiotic treatments, which could be used for in situ microbiota modification to eradicate targeted resistant and/or pathogenic bacteria without affecting other non-targeted bacterial species.

scholarly journals Composition of Vaginal microbiota and their antibiotic susceptibility in symptomatic women

2017 ◽  
Vol 6 (2) ◽  
pp. 427
Author(s):  
Ushadevi Gopalan ◽  
Sathiyakala Rajendiran ◽  
Karthika Jayakumar ◽  
Ranganathan Karnaboopathy
Keyword(s):  
Candida Species ◽  
Antibiotic Susceptibility ◽  
Pathogenic Bacteria ◽  
Vaginal Discharge ◽  
Tertiary Care ◽  
Vaginal Swab ◽  
Reproductive Age ◽  
Klebsiella Pneumonia ◽  
Care Hospital ◽  
Age Group

Background: Bacterial vaginosis is the most prevalent lower genital tract infection in women of reproductive age. The aim of this study was to identify the causative organism in patients with vaginal discharge and to study the sensitivity of the organism to antibiotics.Methods: This was a hospital based prospective study in Department of Obstetrics and Gynecology in a tertiary care hospital over a period of two years. 2062 women with complaints of vaginal discharge were subjected to a high vaginal swab and the sample was cultured, the organisms were identified and antibiotic susceptibility was tested.Results: There was no growth found in 40.7% of patients. E. coli was found to be the most common organism isolated followed by Klebsiella pneumonia and Klebsiella oxytoca. Candida species was isolated in 1.4 % of women. An increased frequency of vaginal infection was found in the age group 26-35 years, followed by age group 36-45 years. 73.2% of the organisms were sensitive to Imipenam, 70.4 % to Amikacin and 65.7% to Gentamycin. There were 10 MRSA strains isolated all of which were sensitive to Vancomycin, Amikacin and Gentamycin.Conclusions: Our study provides information about the different microorganisms present in women with vaginal discharge. Since pathogenic bacteria were more common than Candida species it is recommended to offer treatment to patients after taking a high vaginal swab. Appropriate antibiotics based on culture and sensitivity has to be given along with antifungal agents.

scholarly journals Advances in Optical Detection of Human-Associated Pathogenic Bacteria

Molecules ◽  
2020 ◽  
Vol 25 (22) ◽  
pp. 5256
Author(s):  
Andrea Locke ◽  
Sean Fitzgerald ◽  
Anita Mahadevan-Jansen
Keyword(s):  
Pathogenic Bacteria ◽  
Optical Detection ◽  
Diagnostic Techniques ◽  
Laser Speckle ◽  
Resistant Bacteria ◽  
In Vivo Detection ◽  
Drug Resistant Bacteria ◽  
Detection And Identification ◽  
Free Environment

Bacterial infection is a global burden that results in numerous hospital visits and deaths annually. The rise of multi-drug resistant bacteria has dramatically increased this burden. Therefore, there is a clinical need to detect and identify bacteria rapidly and accurately in their native state or a culture-free environment. Current diagnostic techniques lack speed and effectiveness in detecting bacteria that are culture-negative, as well as options for in vivo detection. The optical detection of bacteria offers the potential to overcome these obstacles by providing various platforms that can detect bacteria rapidly, with minimum sample preparation, and, in some cases, culture-free directly from patient fluids or even in vivo. These modalities include infrared, Raman, and fluorescence spectroscopy, along with optical coherence tomography, interference, polarization, and laser speckle. However, these techniques are not without their own set of limitations. This review summarizes the strengths and weaknesses of utilizing each of these optical tools for rapid bacteria detection and identification.

scholarly journals Developing an antibiotic effective against multi-drug resistant bacteria.

2014 ◽  
Vol 70 (a1) ◽  
pp. C714-C714
Author(s):  
Calvin Steussy ◽  
Cynthia Stauffacher ◽  
Mark Lipton ◽  
Mohamed Seleem
Keyword(s):  
Pathogenic Bacteria ◽  
Modern Medicine ◽  
In Vivo Studies ◽  
Resistant Bacteria ◽  
Drug Resistant ◽  
Lead Compound ◽  
Drug Resistant Bacteria ◽  
Coa Reductase

The emergence of multi-drug resistant pathogenic bacteria is one of the great challenges to modern medicine. The gram positive cocci Methicillin Resistant Staphylococcus aureus (MRSA) and Vancomycin Resistant Enterococcus faecalis (VRE) are two particularly virulent examples. In vivo studies have shown that the eukaryotic like 'mevalonate' isoprenoid pathway used by these pathogenic cocci is essential to their growth and virulence [1]. Our structures of HMG-CoA reductase (HMGR) from P. mevalonii demonstrated that the bacterial enzymes are structurally distinct from the human enzymes allowing for specific antibacterial activity [2]. High throughput in vitro screening against bacterial HMGR at the Southern Research Center, Birmingham, AL uncovered a lead compound with an IC50 of 80 µM with a competitive mode of action. Our x-ray crystal structures of HMGR from E. faecalis complexed with the lead compound and its variations have informed the synthesis of new inhibitors that have improved the IC50 to 5 µM [3]. Studies of this compound show it to be active against both MRSA and VRE in culture, effective against these bacteria in biofilms, and efficacious in a model system of eukaryotic infection. Structures and kinetics of these compounds will be presented and future directions discussed.

scholarly journals Analysis of migration of pathogenic drug-resistant bacteria to soils and groundwater after fertilization with sewage sludge

PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0256936
Author(s):  
Ewa Stańczyk-Mazanek ◽  
Longina Stępniak
Keyword(s):  
Sewage Sludge ◽  
Sandy Soil ◽  
Pathogenic Bacteria ◽  
Water Environment ◽  
Intestinal Bacteria ◽  
Time Frame ◽  
Resistant Bacteria ◽  
Drug Resistant ◽  
Drug Resistant Bacteria ◽  
One Year

The paper discusses the analysis of the effect of using sewage sludge for fertilization on the level of soil and groundwater contamination with drug-resistant bacteria. Other sanitary contaminants in these environments were also analysed. Composted sewage sludge was introduced into the sandy soil over a period of 6 months. The examinations were conducted under conditions of a lysimetric experiment with the possibility of collecting soil leachates (in natural conditions). The following doses of sewage sludge were used: 0, 10, 20, 30 and 40 t/ha calculated per experimental object containing 10 kg of sandy soil. The research were carried out within the time frame of one year. Dactylis glomerata grass was grown on the fertilized soils. In soils and leachates from soils (which may have polluted groundwater) collected from fertilized experimental objects, the sanitary condition and quantity of drug-resistant bacteria (mainly from the families Enterobacteriaceae and Enterococcus) were analysed one year after fertilization. Their drug resistance to selected antibiotics was also analysed based on current recommendations. The study showed that fertilization with sewage sludge (even after stabilization and hygienization) results in contamination of soil and infiltrating waters with many species of drug-resistant pathogenic bacteria. The lowest level of contamination of soil and water environment was found after the application of sewage sludge at a dose of 10 t/ha. The isolated drug-resistant strains of intestinal bacteria were less sensitive to older generations of antibiotics including cefazolin, ampicillin, and co-amoxiclav.

Tea: An anti-bacterial agent against drug resistant bacteria

2021 ◽  
Vol 15 (10) ◽  
pp. 2506-2511
Author(s):  
Nayyab Sultan ◽  
Sabahat Javaid Butt ◽  
Wajeeha Mehak ◽  
Samreen Qureshi ◽  
Syed Hamza Abbas ◽  
...  
Keyword(s):  
Bacterial Infections ◽  
Salmonella Typhi ◽  
Multidrug Resistant ◽  
Resistant Bacteria ◽  
Klebsiella Pneumonia ◽  
Drug Resistant ◽  
Antibiotic Resistant ◽  
Bacterial Agent ◽  
Drug Resistant Bacteria ◽  
Scientific World

Antibiotics have played a crucial role in the treatment of bacterial infections. Past few decades are marked with advancement of multidrug resistant (MDR) pathogens, which have endangered antibiotic’s therapeutic efficacy. Scientific world is now struggling with the crisis of MDR pathogens. This supreme matter demands careful attention or otherwise it would jeopardize clinical management of infectious diseases. Implication of alternative approaches can pave a new way in the treatment of these troublesome bacteria. Tea leaves are known to pose antibacterial activity against many pathogenic microorganisms. This review has summarized the antibacterial potential of tea leave’s extracts against resistant bacterial pathogens such as Staphylococcus aureus, Pseudomonas aeruginosa, Helicobacter pylori, Escherichia coli, Klebsiella pneumonia, Salmonella typhi, Acenitobacter spp, Campylobacter spp. Consumption of natural products such as tea may very well replace, minimize or obliterate this complicated situation. Keywords: Anti-bacterial, Tea, Camellia sinensis, Drug resistant bacteria, Antibiotic resistant bacteria, Synergism, Polyphenols.

scholarly journals Suppression of Emergence of Resistance in Pathogenic Bacteria: Keeping Our Powder Dry, Part 2

2015 ◽  
Vol 60 (3) ◽  
pp. 1194-1201 ◽  
Author(s):  
G. L. Drusano ◽  
William Hope ◽  
Alasdair MacGowan ◽  
Arnold Louie
Keyword(s):  
Pathogenic Bacteria ◽  
Bacterial Resistance ◽  
Multidrug Resistant ◽  
New Drugs ◽  
Resistant Bacteria ◽  
Regulatory Review ◽  
Content Type ◽  
Drug Resistant Bacteria ◽  
Antibiotic Drug ◽  
New Chemical Entities

We are in a crisis of bacterial resistance. For economic reasons, most pharmaceutical companies are abandoning antimicrobial discovery efforts, while, in health care itself, infection control and antibiotic stewardship programs have generally failed to prevent the spread of drug-resistant bacteria. At this point, what can be done? The first step has been taken. Governments and international bodies have declared there is a worldwide crisis in antibiotic drug resistance. As discovery efforts begin anew, what more can be done to protect newly developing agents and improve the use of new drugs to suppress resistance emergence? A neglected path has been the use of recent knowledge regarding antibiotic dosing as single agents and in combination to minimize resistance emergence, while also providing sufficient early bacterial kill. In this review, we look at the data for resistance suppression. Approaches include increasing the intensity of therapy to suppress resistant subpopulations; developing concepts of clinical breakpoints to include issues surrounding suppression of resistance; and paying attention to the duration of therapy, which is another important issue for resistance suppression. New understanding of optimizing combination therapy is of interest for difficult-to-treat pathogens likePseudomonas aeruginosa,Acinetobacterspp., and multidrug-resistant (MDR)Enterobacteriaceae. These lessons need to be applied to our old drugs as well to preserve them and to be put into national and international antibiotic resistance strategies. As importantly, from a regulatory perspective, new chemical entities should have a resistance suppression plan at the time of regulatory review. In this way, we can make the best of our current situation and improve future prospects.

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