scholarly journals A New Concept of Enhancing the Efficacy of Antimicrobial Therapy of Pyo-Inflammatory Diseases in Children

2016 ◽  
Vol 23 (3) ◽  
Author(s):  
V. B. Davydenko ◽  
M. M. Mishyna ◽  
V. V. Myasoedov ◽  
Yu. V. Pashchenko ◽  
S. Yu. Shtyker ◽  
...  
Keyword(s):  
Drug Resistance ◽  
Virulence Factors ◽  
Antimicrobial Therapy ◽  
Pathogenic Bacteria ◽  
Antimicrobial Agents ◽  
Inflammatory Diseases ◽  
Causative Agents ◽  
Spread Of Infection ◽  
High Degree

Pyo-inflammatory diseases are quite common among various surgical diseases in children. Etiotropic antimicrobial therapy of these conditions is of primary importance. Modern pathogenic bacteria possess a high degree of drug resistance to antimicrobials, which significantly reduces the effectiveness of treatment and contributes to the spread of infection and the development of pyo-inflammatory complications.The objective of the research was to study peculiar properties of virulence factors production by S. aureus within 24 hours as well as to determine on this basis the directions of improving the efficiency of antimicrobial therapy of pyo-inflammatory diseases in children.Materials and methods. There were conducted in vitro experimental microbiological studies concerning the study of the daily dynamics of virulence factors of causative agents of purulent-inflammatory diseases in children. The materials for the study were as follows: wound tissues, purulent exudate, dressings and suture material, catheters and drainage elements.Results. Microbiological studies revealed that drug resistance of pathogenic microorganisms originates from the production of various factors of bacterial aggression including the formation of biofilms. The study showed that the level of production of virulence factors and the sensitivity of S. aureus to antimicrobial agents were not constant over the day. Recorded peaks of increasing adhesive activity, teichoic acids content, production of planktonic cells and formation of dense biofilms by S. aureus depended on the time of administration of antimicrobials and maximum concentration of the medication in an organism.Conclusions. The regularity observed allowed us to develop a new concept to increase the efficiency of treatment of pyo-inflammatory diseases in children by means of change in the time for administration of antimicrobial agents during the day so that the period of maximum action would coincide with periods of minimal drug resistance of pathogens. This will allow us to significantly improve the effectiveness of antimicrobial therapy without increasing doses of medications that are administered.

Preliminary in Vitro Investigations on The Inhibitory Activity of The Original Dietary Supplement Oxidal® on Pathogenic Bacterial Strains

2020 ◽  
Vol 11 ◽  
pp. 37-43
Author(s):  
Prof. Teodora P. Popova ◽  
Toshka Petrova ◽  
Ignat Ignatov ◽  
Stoil Karadzhov
Keyword(s):  
Dietary Supplement ◽  
Broad Spectrum ◽  
Pathogenic Bacteria ◽  
Antimicrobial Agents ◽  
Clinical Effectiveness ◽  
Inhibitory Effect ◽  
Diffusion Method ◽  
Bacterial Strains ◽  
Microbial Strains

The antimicrobial action of the dietary supplement Oxidal® was tested using the classic Bauer and Kirby agar-gel diffusion method. Clinical and reference strains of Staphylococcus aureus and Escherichia coli were used in the studies. The tested dietary supplement showed a well-pronounced inhibitory effect against the microbial strains commensurable with that of the broad-spectrum chemotherapeutic agent Enrofloxacin and showed even higher activity than the broad spectrum antibiotic Thiamphenicol. The proven inhibitory effect of the tested dietary supplement against the examined pathogenic bacteria is in accordance with the established clinical effectiveness standards for antimicrobial agents.

scholarly journals <i>In Vitro</i> Mitigation of Pathogenic Bacteria and Virulence Factors Using a Hydroconductive Dressing

2013 ◽  
Vol 04 (11) ◽  
pp. 477-485
Author(s):  
Lauren T. Moffatt ◽  
Rachel T. Ortiz ◽  
Bonnie C. Carney ◽  
Rachael M. Bullock ◽  
Martin C. Robson ◽  
...  
Keyword(s):  
Virulence Factors ◽  
Pathogenic Bacteria

Vaginal microbiomes in women with infertility that was surgical treatment on the uterine appendages

2018 ◽  
pp. 98-102
Author(s):  
A.E. Dubchak ◽  
◽  
A.V. Milevsky ◽  
N.N. Obeid ◽  
◽  
...  
Keyword(s):  
Surgical Treatment ◽  
Antimicrobial Agents ◽  
Inflammatory Diseases ◽  
Reproductive Age ◽  
Anaerobic Microorganisms ◽  
Normal Microflora ◽  
Vaginal Tract ◽  
High Degree ◽  
Aerobic And Anaerobic ◽  
Group 1

The objective: of the study was to study the microbial vaginal tract in women with infertility, who had undergone surgical treatment on the uterine appendages. Materials and methods. An examination of vaginal discharge on flora and STIs was conducted in 120 women of reproductive age with infertility and benign ovarian formations, ectopic pregnancy, which was organ-retained surgical intervention on the appendages of the uterus. Of these, 76 (1 group) patients were surgically treated in a planned manner, 44 (in 2 groups) – in urgent cases. Results. Inflammatory diseases of the genital area were more common in women with infertility, who had surgical treatment in an urgent manner than in women of group 1 (p<0.05), especially inflammatory diseases of the cervix – almost twice as likely as in group 1. The vaginal microbial examination of women with infertility who were hospitalized for surgical treatment in an urgent manner indicates a significant imbalance between the parameters of contamination of the genital tract by conditionally pathogenic and normal microflora. This, above all, was manifested by the high frequency of determination in women of the 2nd group of representatives of optional aerobes and anaerobes (p<0.05). The concentration of facultative-aerobic and anaerobic microorganisms was in patients of the 2nd group, mostly of high degree of microbial dissemination, and in women of the 1 group, medium and low. STIs were found mainly in association with anaerobic and aerobic microorganisms in patients who were operated in an urgent manner. Conclusion. It is necessary to correct the vaginal biotope in women with infertility before surgical treatment – to promptly influence pathogenic microorganisms with antimicrobial agents and restore physiological vaginal microbial vagina. Key words: women, infertility, vaginal microbial, appendages of the uterus, surgical treatment.

Short versus prolonged courses of antimicrobial therapy for patients with uncomplicated Pseudomonas aeruginosa bloodstream infection: a retrospective study

2021 ◽  
Author(s):  
Moonsuk Bae ◽  
Yunseo Jeong ◽  
Seongman Bae ◽  
Min Jae Kim ◽  
Yong Pil Chong ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Bloodstream Infection ◽  
Antimicrobial Therapy ◽  
Antimicrobial Agents ◽  
Propensity Score Analysis ◽  
Tertiary Care ◽  
Care Hospital ◽  
Short Course ◽  
Significant Difference

Abstract Background The optimal duration of antimicrobial therapy for uncomplicated Pseudomonas aeruginosa bloodstream infection (BSI) is unknown. We compared the outcomes of short and prolonged courses of antimicrobial therapy in adults with uncomplicated pseudomonal BSI. Methods All patients with uncomplicated P. aeruginosa BSI admitted at a tertiary-care hospital from April 2010 to April 2020 were included. We compared the primary outcome (a composite of the rate of recurrent P. aeruginosa infection and mortality within 30 days after discontinuing antimicrobial therapy) among patients who underwent short (7‒11 days) and prolonged (12‒21 days) courses of antimicrobial therapy using propensity score analysis with the inverse probability of treatment weighting (IPTW) method. Results We evaluated 1477 patients with P. aeruginosa BSI; of them, 290 met the eligibility criteria who received antimicrobial agents with in vitro activity, including 97 (33%) who underwent short-course therapy [median of 9 (IQR = 8‒11) days] and 193 (67%) who underwent prolonged-course therapy [median of 15 (IQR = 14‒18) days]. We found no significant difference in the risk of recurrence or 30 day mortality between the prolonged-course and short-course groups [n = 30 (16%) versus n = 11 (11%); IPTW-adjusted HR = 0.68, 95% CI = 0.34 − 1.36, P = 0.28]. The prolonged-course therapy did not significantly reduce the risk of the recurrence of P. aeruginosa infection within 180 days compared with short-course therapy [n = 37 (19%) versus n = 12 (12%); IPTW-adjusted HR = 0.57, 95% CI = 0.29 − 1.10, P = 0.09]. Conclusions Short-course antimicrobial therapy could be as effective as prolonged-course therapy for uncomplicated P. aeruginosa BSI.

scholarly journals Evaluation and Comparison of Antibacterial Efficacy of Herbal Extracts in Combination with Antibiotics on Periodontal pathobionts: An in vitro Microbiological Study

Antibiotics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 89 ◽  
Author(s):  
Shahabe Abullais Saquib ◽  
Nabeeh Abdullah AlQahtani ◽  
Irfan Ahmad ◽  
Mohammed Abdul Kader ◽  
Sami Saeed Al Shahrani ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Plant Extracts ◽  
Pathogenic Bacteria ◽  
Bacterial Resistance ◽  
Antimicrobial Agents ◽  
Synergistic Activity ◽  
Antibacterial Efficacy ◽  
Herbal Extracts ◽  
Inhibition Zones

Background: In the past few decades focus of research has been toward herbal medicines because of growing bacterial resistance and side effects of antimicrobial agents. The extract derived from the plants may increase the efficacy of antibiotics when used in combination against pathogenic bacteria. In the current study, the synergistic antibacterial efficacy of plant extracts in combination with antibiotics has been assessed on selected periodontal pathogens. Methods: Ethanolic extracts were prepared from Salvadora persica (Miswak) and Cinnamomum zeylanicum (Ceylon cinnamon), by the soxhalate method. Plaque samples were collected from clinical periodontitis patients to isolate and grow the periodontal pathobionts under favorable conditions. Susceptibility of bacteria to the extracts was assessed by gauging the diameter of the inhibition zones. Minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of plant extracts were determined against each bacterium. Synergistic activity of plants extract in combination with antibiotics against the bacteria was also assessed by measuring the diameter of the inhibition zones. Results: Ethanolic extract of both the plants showed an inhibitory effect on the proliferation and growth of all four strains of periodontal pathobionts. Maximum antibacterial activity was exhibited by C. zeylanicum against Tannerella forsythia (MIC = 1.56 ± 0.24 mg/mL, MBC = 6.25 ± 0.68 mg/mL), whereas among all the studied groups the minimum activity was reported by C. zeylanicum against Aggregatibacter actinomycetemcomitans the (MIC = 12.5 ± 3.25 mg/mL, MBC = 75 ± 8.23 mg/mL). Combination of herbal extracts with different antibiotics revealed a synergistic antibacterial effect. The best synergism was exhibited by S. persica with metronidazole against A. actinomycetemcomitans (27 ± 1.78). Conclusions: Current in vitro study showed variable antibacterial activity by experimented herbal extracts against periodontal pathobionts. The synergistic test showed significant antibacterial activity when plant extracts were combined with antibiotics.

scholarly journals Detection of Pan drug resistance OXA-48 producing Providencia in an ICU patient for the first time in Nepal

2019 ◽  
Vol 8 (1) ◽  
Author(s):  
Ranjit Sah ◽  
Shusila Khadka ◽  
Gentle Sunder Shrestha ◽  
Subhash Acharya ◽  
Diptesh Aryal ◽  
...  
Keyword(s):  
Drug Resistance ◽  
Pathogenic Bacteria ◽  
Antimicrobial Agents ◽  
Vital Signs ◽  
Carbapenem Resistance ◽  
Diffusion Method ◽  
Resistance Pattern ◽  
Common Mechanism ◽  
Disk Diffusion Method ◽  
Drug Resistance Pattern

Abstracts Background Resistance to antimicrobial agents of pathogenic bacteria has become a major problem in routine medical practices. Carbapenem resistance has long been increasing. The production of carbapenem- hydrolysing β-lactamases (carbapenamases), which include NDM, KPC, OXA-48, IMP-1 and VIM is the most common mechanism. Case presentation A 56 years old male presented with fever and mental changes with progressively decreasing sensorium for the last 3 days. He was admitted to Intensive care unit (ICU) with a diagnosis of meningoencephalitis. On day seven, he developed ventilator associated pneumonia due Klebsiella pnemoniae and Acinetobacter baumannii. He was on meropenem, but the isolates were susceptible to colistin, tigecyclin and amikacin solely. Hence, amikacin was started with addition of intravenous and nebulized colistin. Subsequently, vital signs improved with resolution of fever. However, on day 18, he developed fever once again with a drop in blood pressure. Inotropic support was maintained, and echinocandins and tigecycline were added to the regimen. Repeat blood and urine culture grew Providencia species, which were resistant to most of the drugs on phenotypic Kirby-Bauer disk diffusion method and are intrinsically resistant to colistin and tigecycline. Phenotypic detection of ESBL (combined disk method), MBL, KPCs, AmpC and co-producer were tested according to updated CLSI guideline and all were negative. But the Modified Hodges test was found to be positive. Consequenty, OXA-48 drug resistance pattern was brought into action by blank disc method according to A Tsakris et al., which revealed indentation of growth toward both EDTA and EDTA/PBA disk indicating production of OXA-48 carbapenamase. To confirm the resistance pattern we processed the isolated colonies for Xpert Carba-R (Cepheid) assay, which detected blaOXA-48 gene and confirmed the OXA-48 drug resistance pattern. Hence, the infecting organism was not susceptible to any of the antibiotics. The patient was kept under isolation and on 31th day of admission, he died of septic shock. Conclusions Carbapenamase production along with intrinsic colistin resistance in infecting bacterial pathogens can cause fatal outcomes in the resource limited countries like Nepal where new antibiotic combinations ceftazidime+ Avibactam, or aztreonam +avibactam are not available. Drug resistance patterns including OXA 48 producer should be characterized in all cases by standard phenotypic methods or by Xpert Carba-R assay and larger studies are required to know the exact burden of OXA 48 producer in Nepal.

scholarly journals Chloramphenicol Resurrected: A Journey from Antibiotic Resistance in Eye Infections to Biofilm and Ocular Microbiota

2019 ◽  
Vol 7 (9) ◽  
pp. 278 ◽  
Author(s):  
Lorenzo
Keyword(s):  
Pathogenic Bacteria ◽  
Bacterial Resistance ◽  
Antimicrobial Agents ◽  
In Vivo Studies ◽  
Antibiofilm Activity ◽  
Eye Infections ◽  
Treatment And Prevention ◽  
Old Drugs

The advent of multidrug resistance among pathogenic bacteria is devastating the worth of antibiotics and changing the way of their administration, as well as the approach to use new or old drugs. The crisis of antimicrobial resistance is also due to the unavailability of newer drugs, attributable to exigent regulatory requirements and reduced financial inducements. The emerging resistance to antibiotics worldwide has led to renewed interest in old drugs that have fallen into disuse because of toxic side effects. Thus, comprehensive efforts are needed to minimize the pace of resistance by studying emergent microorganisms and optimize the use of old antimicrobial agents able to maintain their profile of susceptibility. Chloramphenicol is experiencing its renaissance because it is widely used in the treatment and prevention of superficial eye infections due to its broad spectrum of activity and other useful antimicrobial peculiarities, such as the antibiofilm properties. Concerns have been raised in the past for the risk of aplastic anemia when chloramphenicol is given intravenously. Chloramphenicol seems suitable to be used as topical eye formulation for the limited rate of resistance compared to fluoroquinolones, for its scarce induction of bacterial resistance and antibiofilm activity, and for the hypothetical low impact on ocular microbiota disturbance. Further in-vitro and in vivo studies on pharmacodynamics properties of ocular formulation of chloramphenicol, as well as its real impact against biofilm and the ocular microbiota, need to be better addressed in the near future.

scholarly journals The HtrA-Like Protease CD3284 Modulates Virulence of Clostridium difficile

2014 ◽  
Vol 82 (10) ◽  
pp. 4222-4232 ◽  
Author(s):  
Dennis Bakker ◽  
Anthony M. Buckley ◽  
Anne de Jong ◽  
Vincent J. C. van Winden ◽  
Joost P. A. Verhoeks ◽  
...  
Keyword(s):  
Clostridium Difficile ◽  
Virulence Factors ◽  
Pathogenic Bacteria ◽  
Microarray Data Analysis ◽  
Toxin A ◽  
Hamster Model ◽  
Golden Syrian Hamster ◽  
Content Type

ABSTRACTIn the past decade,Clostridium difficilehas emerged as an important gut pathogen. Symptoms ofC. difficileinfection range from mild diarrhea to pseudomembranous colitis. Besides the two main virulence factors toxin A and toxin B, other virulence factors are likely to play a role in the pathogenesis of the disease. In other Gram-positive and Gram-negative pathogenic bacteria, conserved high-temperature requirement A (HtrA)-like proteases have been shown to have a role in protein homeostasis and quality control. This affects the functionality of virulence factors and the resistance of bacteria to (host-induced) environmental stresses. We found that theC. difficile630 genome encodes a single HtrA-like protease (CD3284; HtrA) and have analyzed its rolein vivoandin vitrothrough the creation of an isogenic ClosTron-basedhtrAmutant ofC. difficilestrain 630Δerm(wild type). In contrast to the attenuated phenotype seen withhtrAdeletion in other pathogens, this mutant showed enhanced virulence in the Golden Syrian hamster model of acuteC. difficileinfection. Microarray data analysis showed a pleiotropic effect ofhtrAon the transcriptome ofC. difficile, including upregulation of the toxin A gene. In addition,the htrAmutant showed reduced spore formation and adherence to colonic cells. Together, our data show thathtrAcan modulate virulence inC. difficile.

scholarly journals Inoculum size effects in blaIMP-6 and plasmid-mediated quinolone resistance gene-positive Enterobacteriaceae in Japan

2019 ◽  
Author(s):  
Yoshihiko Ogawa ◽  
Ryuichi Nakano ◽  
Kei Kasahara ◽  
Tomoki Mizuno ◽  
Nobuyasu Hirai ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Drug Resistance ◽  
Klebsiella Pneumoniae ◽  
Size Effect ◽  
Resistance Gene ◽  
Size Effects ◽  
Antimicrobial Agents ◽  
Inoculum Size ◽  
Experimental Strains

AbstractThe aim of this study was to examine the resistance genes in clinical isolates which produced IMP-6 type metallo-β-lactamase lactamase (MBL) and had mildly reduced susceptibilities to levofloxacin and/or amikacin. The inoculum size effect was also assessed. A total of 14 Enterobacteriaceae isolates (2 Escherichia coli and 12 Klebsiella pneumoniae) which produced IMP-6 MBL, and had mild increases in their MICs for levofloxacin and amikacin were examined. Thirteen out of 14 isolates harbored CTX-M-2, with the remaining isolate co-harboring CTX-M-2 and CTX-M-1 as ESBLs. All isolates carried one or more PMQRs; aac(6′)-Ib-cr was the most prevalent (92.8%), followed by oqxA (64.3%), qnrS (42.9%), oqxAB (21.4%), and qnrB (14.3%). The inoculum size effects were significant in all strains for meropenem, 13 for imipenem, 7 for levofloxacin, and 3 for amikacin. Conjugation was successfully performed with 8 isolates and 11 strains were obtained. Eleven of the experimental strains (100%), and 8 strains (72.7%) showed inoculum size effects for meropenem and imipenem, respectively. No inoculum size effect was seen for levofloxacin. Four strains harbored qnr genes and 2 strains harbored qnr genes and QRDR mutations concurrently. blaIMP-6 positive Enterobacteriaceae with mildly reduced susceptibilities to levofloxacin and/or amikacin also harbored at least one plasmid-mediated drug resistance gene. These represent an unrecognized threat, capable of compromising the in vitro activity of many classes of antimicrobial agents. We conclude that IMP-6 MBL plays an important role in decreasing the MIC for carbapenems, whereas qnr does not for levofloxacin.

Antimicrobial Activity of Myrtus communis L., Cinnamomum verum and Eugenia caryophyllata Alcoholic Mixtures

2020 ◽  
Vol 16 (2) ◽  
pp. 207-212
Author(s):  
Wissam Zam ◽  
Ali Ali ◽  
Walaa Ibrahim
Keyword(s):  
Bacterial Infections ◽  
Pathogenic Bacteria ◽  
Antimicrobial Agents ◽  
Antimicrobial Activities ◽  
Diffusion Method ◽  
Myrtus Communis ◽  
Myrtus Communis L ◽  
Inhibition Zones ◽  
Alcoholic Mixtures

Background and Objective: With the significant increase in the prevalence of infectious diseases and the development of drug resistance by human pathogenic bacteria, there is a continuous need to discover new antimicrobial compounds from plants. Methods: Four extracts of wild Myrtus communis L. berries (myrtle berries) were prepared with the addition of Cinnamomum verum and Eugenia caryophyllata. The extracts were screened in vitro for their antimicrobial activities using agar-well diffusion method against Escherichia coli, Staphylococcus aureus, Enterobacter cloacae, Listeria monocytogenes, Pseudomonas aeruginosa and Proteus mirabilis cultures. Results: The inhibition zones ranged from 12 to 22 mm. The MICs values of extracts lies between the ranges of 30 to 100 mg/ml. Of the extracts studied, the most active ones were those obtained from the myrtle berries:cloves, myrtle berries:cinnamon:cloves with the highest inhibition zones 22 mm and 17mm against S. aureus and L. monocytogenes at 50 mg/ml and 80 mg/ml, respectively. None of the extracts was active against E. coli and P. mirabilis. Conclusion: The present investigations have exposed that the myrtle berries:cloves, myrtle berries: cinnamon:cloves extracts could be used in traditional medicine as natural antimicrobial agents in treatment the bacterial infections.

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