scholarly journals Antibacterial Agents Adsorbed on Active Carbon: A New Approach for S. aureus and E. coli Pathogen Elimination

Pathogens ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1066
Author(s):  
Ewa Burchacka ◽  
Katarzyna Pstrowska ◽  
Elżbieta Beran ◽  
Hanna Fałtynowicz ◽  
Katarzyna Chojnacka ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Antibacterial Agents ◽  
Bacterial Resistance ◽  
Antimicrobial Agents ◽  
Growth Reduction ◽  
Antibacterial Drugs ◽  
New Approach ◽  
Antibiotic Overuse ◽  
E Coli ◽  
Pathogen Elimination

Antibiotic overuse and mass production have led to a global problem with the treatment of antibacterial infections. Thus, any possibility to limit the number of antibacterial drugs used will contribute to a decrease in the development of pathogenic bacterial resistance. In this study, the enhanced bacterial growth reduction of pharmaceutical activated carbon (PAC) material with adsorbed antimicrobial agents compared to the activity of pure antibacterial drugs was investigated. Sulfamethoxazole (SMZ) at a concentration of 1.1 mg/mL retained the growth of S. aureus and E. coli at 20.5% and 26.5%, respectively, whereas SMZ adsorbed on PAC increased the reduction of the tested bacteria in the range of 47–72%. The use of PAC with adsorbed gentamycin (G) over 24 h improved the effectiveness of E. coli growth reduction by 50% compared to the application of pure antibiotic (3.6 µg/mL). The increased reduction of S. aureus growth by 6% using G with PAC for a 24-h incubation time compared to the use of pure antibiotics at a concentration of 3.6 µg/mL was observed. The results provide proof-of-principle that the new approach of activated carbon with adsorbed antimicrobial agents could yield an attractive background with potential as a new starting material for S. aureus and E. coli pathogen elimination, e.g., in wound-healing treatment in the future.

Antibiotic adjuvants: a promising approach to combat multidrug resistant bacteria

2021 ◽  
Vol 22 ◽  
Author(s):  
Namita Sharma ◽  
Anil K. Chhillar ◽  
Sweety Dahiya ◽  
Pooja Choudhary ◽  
Aruna Punia ◽  
...  
Keyword(s):  
Drug Targets ◽  
Pathogenic Bacteria ◽  
Antibacterial Agents ◽  
Bacterial Resistance ◽  
Multidrug Resistant ◽  
Resistant Bacteria ◽  
Antibacterial Drugs ◽  
Effective Strategies ◽  
The Impact ◽  
Emergence Of Resistance

The escalating emergence and prevalence of infections caused by multi-drug resistant (MDR) pathogenic bacteria accentuate the crucial need to develop novel and effectual therapeutic strategies to control this threat. Recent past surprisingly indicates a staggering decline in effective strategies against MDR. Different approaches have been employed to minimize the effect of resistance but the question still lingers over the astounding number of drugs already tried and tested to no avail, furthermore, the detection of new drug targets and the action of new antibacterial agents against already existing drug targets also complicate the condition. Antibiotic adjuvants are considered as one such promising approach for overcoming the bacterial resistance. Adjuvants can potentiate the action of generally adopted antibacterial drugs against MDR bacterial pathogens either by minimizing the impact and emergence of resistance or improving the action of antibacterial drugs. This review provides an overview of mechanism of antibiotic resistance, main types of adjuvants and their mode of action, achievements and progression.

The Activity of Alkanna Species in vitro Culture and Intact Plant Extracts Against Antibiotic Resistant Bacteria

2019 ◽  
Vol 25 (16) ◽  
pp. 1861-1865 ◽  
Author(s):  
Naira Sahakyan ◽  
Margarit Petrosyan ◽  
Armen Trchounian
Keyword(s):  
Antibiotic Resistance ◽  
Antibacterial Agents ◽  
Bacterial Resistance ◽  
Antimicrobial Agents ◽  
Resistant Bacteria ◽  
Plant Origin ◽  
Bacterial Strains ◽  
Biotechnological Production ◽  
Antibiotic Resistant

Overcoming the antibiotic resistance is nowadays a challenge. There is still no clear strategy to combat this problem. Therefore, the urgent need to find new sources of antibacterial agents exists. According to some literature, substances of plant origin are able to overcome bacterial resistance against antibiotics. Alkanna species plants are among the valuable producers of these metabolites. But there is a problem of obtaining the standardized product. So, this review is focused on the discussion of the possibilities of biotechnological production of antimicrobial agents from Alkanna genus species against some microorganisms including antibiotic resistant bacterial strains.

scholarly journals Surveillance and Correlation of Antibiotic Prescription and Resistance of Gram-Negative Bacteria in Singaporean Hospitals

2010 ◽  
Vol 54 (3) ◽  
pp. 1173-1178 ◽  
Author(s):  
Li-Yang Hsu ◽  
Thean-Yen Tan ◽  
Vincent H. Tam ◽  
Andrea Kwa ◽  
Dale Andrew Fisher ◽  
...  
Keyword(s):  
Klebsiella Pneumoniae ◽  
Correlation Analysis ◽  
Cross Correlation ◽  
Bacterial Resistance ◽  
Antimicrobial Agents ◽  
Antibiotic Prescription ◽  
Time Lag ◽  
Gram Negative ◽  
E Coli ◽  
Cross Correlation Analysis

ABSTRACT A surveillance study was performed in four Singapore public hospitals from 2006 to 2008 to determine the correlation between antibiotic prescription and Gram-negative bacterial antimicrobial resistance. Targeted organisms included ceftriaxone- and ciprofloxacin-resistant Escherichia coli and Klebsiella pneumoniae, as well as imipenem-resistant Pseudomonas aeruginosa and Acinetobacter spp. Antibiotic prescription data were collated in the WHO anatomical therapeutic chemical (ATC)/defined daily dose (DDD) format, while antibiotic resistance was expressed as incidence density adjusted for total inpatient-days every quarter. Individual trends were determined by linear regression, while possible associations between antibiotic prescription and resistance were evaluated via cross-correlation analysis. Results over 3 years indicated significantly rising incidence densities of ceftriaxone- and ciprofloxacin-resistant E. coli and imipenem-resistant Acinetobacter spp. (blood isolates only). Antimicrobial-resistant Klebsiella pneumoniae rates declined. The prescription rates of piperacillin-tazobactam, ertapenem, meropenem, ciprofloxacin, and levofloxacin increased significantly, while imipenem and moxifloxacin prescription decreased. Cross-correlation analysis demonstrated possible associations between prescription of fluoroquinolones and ciprofloxacin-resistant E. coli (R 2 = 0.46), fluoroquinolones and ceftriaxone-resistant E. coli (R 2 = 0.47), and carbapenems and imipenem-resistant Acinetobacter spp. (R 2 = 0.48), all at zero time lag. Changes in meropenem prescription were associated with a similar trend in imipenem-resistant Acinetobacter blood isolates after a 3-month time lag. No correlation was found between cephalosporin use and resistance. In conclusion, our data demonstrated correlation between prescription of and Gram-negative bacterial resistance to several, but not all, key antimicrobial agents in Singapore hospitals. In areas where Gram-negative bacterial resistance is endemic and prescription of broad-spectrum antimicrobial agents is high, factors other than antimicrobial usage may be equally important in maintaining high resistance rates.

scholarly journals Cloacael Carriage and Multidrug Resistance Escherichia coli O157:H7 from Poultry Farms, Eastern Ethiopia

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Mude Shecho ◽  
Naod Thomas ◽  
Jelalu Kemal ◽  
Yimer Muktar
Keyword(s):  
Multidrug Resistance ◽  
Bacterial Resistance ◽  
Antimicrobial Agents ◽  
Latex Agglutination ◽  
Diffusion Method ◽  
Poultry Farm ◽  
Cross Sectional ◽  
Eastern Ethiopia ◽  
E Coli ◽  
Poultry Farms

A cross-sectional study was carried out to determine antimicrobial drug resistance patterns of E. coli O157:H7 isolates and estimate the level of the pathogen. A total of 194 cloacae swab samples were collected randomly in two poultry farms. Standard cultural, biochemical, and serological (latex agglutination) methods were used to isolate E. coli O157:H7. The isolates were subjected to antimicrobial susceptibility testing using disc diffusion method. Out of 194 cloacae samples examined, 13.4% (n=26) were found to be positive for E. coli O157:H7. The finding indicated differences in E. coli O157:H7 infection among the different risk factors. Chicken from Adele Poultry Farm showed higher E. coli O157:H7 infection (OR = 3.89) than Haramaya University poultry farm and young birds had more infection (OR = 4.62) than adult birds. Of the total 14 antimicrobials included in the panel of study, the susceptibility results were varied with 96.15% and 0% E. coli O157:H7 isolates expressing resistance to erythromycin, clindamycin, spectinomycin, and ciprofloxacin, respectively. Multidrug resistance to more than two antimicrobial agents was detected in 24 (92.30%) of the isolates. The study showed high presence of antimicrobial resistant isolates of E. coli O157:H7. Further study is required to better understand the ecology and evolution of bacterial resistance to antimicrobial agents.

scholarly journals Nosocomial post-cesarean endometritis: a rationalized strategy of antibacterial therapy

2018 ◽  
Vol 12 (2) ◽  
pp. 12-20
Author(s):  
N. A. Korobkov ◽  
N. N. Volkov ◽  
E. R. Tsoy ◽  
S. М. Mikaelyan
Keyword(s):  
Antibacterial Therapy ◽  
Antibacterial Agents ◽  
Antimicrobial Agents ◽  
Multidrug Resistant ◽  
E Coli ◽  
Number Of Patients ◽  
Previously Treated ◽  
New Mother ◽  
Clinically Significant ◽  
Klebsiella Spp

The number of patients with nosocomial post-cesarean endometritis is steadily growing. Aim: to study the etiology of nosocomial post-cesarean endometritis and to propose a rationalized antimicrobial therapy. Material and methods. Sixty six puerperas with post-cesarean endometritis were examined. The spectrum of microflora and its resistance to antimicrobial agents were determined using an automatic microbiological analyzer based on mass spectrometry. Results. Enterococci, E. coli, staphylococci and streptococci were the most clinically significant pathogens found in the examined patients with post-cesarean endometritis. The microflora spectrum in the endometrium reflected the previous «antibacterial history»; this association must be taken into account when developing antibacterial therapy. Conclusion. If the new mother was previously treated with antibacterial agents, it is recommended to use a combination of the reserve antibiotics in order to block the entire spectrum of possible multidrug-resistant pathogens. In cases of the resistant Gram-positive microflora (MRSE, MRSA, E. faecium), it is advisable to prescribe vancomycin. For the resistant Gram-negative microflora (Enterobacter spp., Citrobacter spp., E. coli-ESBL+ and Klebsiella spp.-ESBL+), vancomycin should be combined with carbapenems.

scholarly journals ANALYSIS OF CONSUMPTION OF ANTIBACTERIAL DRUGS FOR SYSTEMIC USE IN HOSPITALS OF SAINT PETERSBURG IN 2014–2015

2018 ◽  
Vol 10 (3) ◽  
pp. 115-123
Author(s):  
Yu. M. Gomon ◽  
A. A. Kurylev ◽  
A. S. Kolbin ◽  
M. A. Proskurin ◽  
I. G. Ivanov ◽  
...  
Keyword(s):  
Bacterial Resistance ◽  
Antimicrobial Agents ◽  
Absolute Number ◽  
Control Measures ◽  
Defined Daily Dose ◽  
Antimicrobial Drugs ◽  
Antibacterial Drugs ◽  
Infection Control Measures ◽  
Bed Days ◽  
Structure Of Consumption

Introduction. The overuse of antimicrobial agents, and poor adherence to infection control measures are leading factors in the development of bacterial resistance. Despite the existence of numerous guidelines for the management of patients with different sites of infections up to 50% of assignments of antimicrobial agents does not follow them.Aim. The aim of the study is to evaluate the structure and dynamics of the consumption of antimicrobial agents for systemic use in the multidisciplinary hospitals of St. Petersburg in 2014–2015.Materials and methods. From the database of IMS Health were selected information regarding the supply of antimicrobial agents for systemic use (ATC code J01) in hospitals of St.Petersburg in 2014–2015. The Number of purchased antimicrobial drugs (g) is translated into a number of Defined Daily Dose (DDDh) for each international non-proprietary name.Results. The level of consumption of AMP in 2014 was 83,3 DDDh/100 bed-days. In 2015, this figure amounted to 50,5 DDDh/100 bed-days. 70% of consumption of antimicrobial drug for systemic use in multidisciplinary hospitals amounted to 3 groups: fluoroquinolones, cephalosporins and semisynthetic penicillins. In 2015, in comparison with the previous year absolute value of fluoroquinolones decreased by 58% in favor of cephalosporins (+15%) while reducing the total number of DDDs used system antimicrobial agents (-40,5%), which is probably connected with the introduction into clinical practice of Russian clinical guidelines for the treatment of infections of various localizations and the perioperative antibiotic prophylaxis. There was growth in the number of purchased carbapenems and macrolides (+21 and +7% respectively) and significant decrease in the absolute number of purchased aminoglycosides (61%), with significant reduction in the consumption of expensive drugs: tigecycline, polymyxin, daptomycin, cefoperazone/sulbactam.Conclusion. The level and structure of consumption of antimicrobial agents corresponds to global data. The implementation of monitoring of antimicrobial therapy is an important factor influencing the volume and structure of consumption of antibacterial drugs. 

scholarly journals Zinc can counteract selection for ciprofloxacin resistance

2019 ◽  
Author(s):  
Michiel Vos ◽  
Louise Sibleyras ◽  
Lai Ka Lo ◽  
Elze Hesse ◽  
William Gaze ◽  
...  
Keyword(s):  
Bacterial Resistance ◽  
Antimicrobial Agents ◽  
E Coli ◽  
Resistance Evolution ◽  
Synergistic Interactions ◽  
Selection Dynamics ◽  
Low Concentrations ◽  
Fluoroquinolone Antibiotics ◽  
Ciprofloxacin Resistance ◽  
Zinc Cations

AbstractAntimicrobial resistance (AMR) has emerged as one of the most pressing global threats to public health. AMR evolution occurs in the clinic but also in the environment, where low concentrations of antibiotics and heavy metals can respectively select and co-select for resistance. While the selective potential for AMR of both antibiotics and metals is increasingly well-characterized, studies exploring the combined effect of both types of selective agents are rare. It has previously been demonstrated that fluoroquinolone antibiotics such as ciprofloxacin can chelate metal ions. To investigate how ciprofloxacin resistance is affected by the presence of metals, we quantified selection dynamics between a ciprofloxacin-susceptible and an isogenic ciprofloxacin-resistant Escherichia coli MG1655 strain across a gradient of ciprofloxacin concentrations in the presence and absence of Zinc cations (Zn2+). The minimal selective concentration (MSC) for ciprofloxacin resistance significantly increased up to 5-fold in the presence of Zn2+. No such effect on the MSC was found for gentamicin, an antibiotic not known to chelate zinc cations. Environmental pollution usually consists of complex mixtures of antimicrobial agents. Our findings highlight the importance of taking antagonistic as well as additive or synergistic interactions between different chemical compounds into account when considering their effect on bacterial resistance evolution.Graphical abstractOne sentence summaryThe minimal selective concentration for a ciprofloxacin resistant E. coli strain increases up to 5-fold in the presence of Zinc cations.

Efficacy of Usnea sp. Extracts in Preventing Biofilm Formation by Bacillus Species Isolated from Soaking Liquor Samples

2020 ◽  
Vol 115 (6) ◽  
pp. 222-229
Author(s):  
Didem Berber ◽  
İpek Türkmenoğlu ◽  
Meral Birbir ◽  
Nüzhet Cenk Sesal
Keyword(s):  
Biofilm Formation ◽  
Antibacterial Agents ◽  
Bacterial Resistance ◽  
Antimicrobial Agents ◽  
Biological Activities ◽  
Bacillus Species ◽  
Bacterial Biofilms ◽  
Bacterial Cells ◽  
Leather Industry ◽  
Acetone Extracts

Bacteria forms biofilm to be resistant to antibacterial agents and other unfavorable environment as compared to planktonic bacterial cells. Due to resistance of bacterial biofilms to commonly used antimicrobial agents and adverse effects of these biofilms in different industries, potential natural compounds which can inhibit bacterial biofilms have attracted more attention in recent years. Lichens are known to have unique secondary metabolites with various biological activities including anti-biofilm properties. Therefore, Bacillus toyonensis, Bacillus mojavensis, Bacillus subtilis, Bacillus amyloliquefaciens, Bacillus velezensis, Bacillus cereus, and Bacillus licheniformis, isolated from soak liquor samples in the previous study, were tested for their ability to form biofilm in this study. Biofilm-forming Bacillus species were detected as B. subtilis, B. amyloliquefaciens, and B. velezensis. The anti-biofilm effect of the acetone extracts of Usnea sp. was evaluated at various concentrations against these biofilm-forming isolates. The anti-biofilm effect of acetone extracts of Usnea sp. against B. subtilis and B. amyloliquefaciens was observed at the concentration of 5 µg/mL by inhibition ratios of 62.75% and 72.72%, respectively. In addition, biofilm formation of B. velezensis was inhibited by the treatment with 1.25 µg/mL extracts at a 62.69% inhibition rate. Biofilm formations of B. amyloliquefaciens and B. velezensis were also suppressed by the extracts at varying percentages of inhibition ranging between 10.11-43.69% and 21.25-46.35%, respectively. This study may provide an alternative approach to overcome the biofilm formation and bacterial resistance to the antibacterial agents in the leather industry.

scholarly journals Structure-Antibacterial Activity Relationships Of N-Substituted-(D-/L-Alaninyl) 1H-1,2,3-Triazolylmethyl Oxazolidinones

2018 ◽  
Author(s):  
Oludotun Phillips ◽  
Edet Ekpenyong Udo ◽  
Roselyn Jennifer D’silva
Keyword(s):  
Antibacterial Activity ◽  
Antibacterial Agents ◽  
Bacterial Resistance ◽  
Clinical Usefulness ◽  
Antibacterial Resistance ◽  
Bacterial Strains ◽  
Gram Positive ◽  
Resistance Development ◽  
Antibacterial Drugs ◽  
Gram Negative

Bacterial resistance towards existing class of antibacterial drugs continues to increase posing significant threat to clinical usefulness of these drugs. This increasing and alarming rates of antibacterial resistance development and the decline in the number of new antibacterial drugs approval continue to serve as major impetus for research into discovery and development of new antibacterial agents. We synthesized a series D-/L-alaninyl substituted triazolyl oxazolidinone derivatives and evaluated their antibacterial activity against selected standard Gram-positive and Gram-negative bacterial strains. Overall, the compounds showed moderate to strong antibacterial activity. Compounds 9d and 10d (D- and L-alaninyl derivatives bearing 3,5-dinitrobenzoyl substituent), 10e (D-alaninyl derivative bearing 5-nitrofurancarbonyl group) and 9f and 10f (D- and L-alaninyl derivatives bearing 5-nitrothiophene carbonyl moiety) demonstrated antibacterial activity (MIC:2 g/mL) against S. aureus, S. epidermidis, E. faecalis and M. catarrhalis standard bacterial strains. No significant differences were noticeable between the antibacterial activity of the D- and L-alaninyl derivatives as a result of the stereochemistry of the compounds.

scholarly journals Prevalence of Antimicrobial Resistance (AMR) Salmonella spp. and Escherichia coli Isolated From Broilers in East Coast Malaysia

2020 ◽  
Author(s):  
Nor Fadhilah Kamaruzzaman ◽  
Shamsaldeen Saeed
Keyword(s):  
Escherichia Coli ◽  
Antimicrobial Resistance ◽  
Bacterial Resistance ◽  
Antimicrobial Agents ◽  
East Coast ◽  
Control Measures ◽  
Growth Promoters ◽  
Salmonella Spp ◽  
E Coli ◽  
High Prevalence

Abstract:Salmonella species (spp) and Escherichia coli (E. coli) are the most common infectious pathogens in poultry. Antimicrobials were given either for the treatment or growth promoters that can increase the possibility of emergence of bacterial resistance towards antimicrobials. The aim of this study was to determine the prevalence of antimicrobial resistant (AMR) Salmonella spp and E. coli isolated from a sample of broiler farms in East Coast Malaysia from 2018-2019. A total of 384 cloacal swabs were collected from broilers farms in Kelantan, Terengganu, and Pahang. The bacteria were isolated and confirmed by bacteriological and serological methods. Following that, confirmed isolates were subjected to antimicrobial susceptibility test. Salmonella spp and E. coli were recovered from the cloacal swabs samples with the overall prevalence of 6.5% and 51.8% respectively. In Kelantan, Terengganu and Pahang, the prevalence of Salmonella spp were 7%, 6.5% and 5.8% respectively, while the prevalence for E. coli were 50%, 48.3% and 58% respectively. Salmonella spp and E. coli displayed resistance towards the following antimicrobials: erythromycin (100% for both pathogens), chloramphenicol (76.2%, 84.5%), tetracycline (62%, 94.6%), ampicillin (47.7%, 87%), sulfamethoxazole/trimethoprim (42.9%, 83.3%), ciprofloxacin (4.8%, 23.8%), nalidixic acid (9.6%, 60.7%), streptomycin (19%,66%), and kanamycin (28.6%,57%), cephalotin (0%, 11%), gentamicin (0%, 20.2%) respectively. No resistance were recorded towards colistin for both pathogens. Multidrug resistance (MDR) was recorded in 82% of Salmonella spp and 100% of E. coli. These findings demonstrate the high prevalence of MDR Salmonella spp. and E. coli in broiler farms in East coast Malaysia. This could be attributed to the excessive use of antimicrobial agents by the poultry farm owners. Enhanced control measures and a strong monitoring system should be urgently implemented to reduce the emergence of antimicrobial resistance that is harmful to public health.

Sign in / Sign up

Export Citation Format

Share Document