Displaying publications 61 - 80 of 244 in total

Abstract:
Sort:
  1. Heng SP, Letchumanan V, Deng CY, Ab Mutalib NS, Khan TM, Chuah LH, et al.
    Front Microbiol, 2017;8:997.
    PMID: 28620366 DOI: 10.3389/fmicb.2017.00997
    Vibrio vulnificus is a Gram negative, rod shaped bacterium that belongs to the family Vibrionaceae. It is a deadly, opportunistic human pathogen which is responsible for the majority of seafood-associated deaths worldwide. V. vulnificus infection can be fatal as it may cause severe wound infections potentially requiring amputation or lead to sepsis in susceptible individuals. Treatment is increasingly challenging as V. vulnificus has begun to develop resistance against certain antibiotics due to their indiscriminate use. This article aims to provide insight into the antibiotic resistance of V. vulnificus in different parts of the world as well as an overall review of its clinical manifestations, treatment, and prevention. Understanding the organism's antibiotic resistance profile is vital in order to select appropriate treatment and initiate appropriate prevention measures to treat and control V. vulnificus infections, which should eventually help lower the mortality rate associated with this pathogen worldwide.
    Matched MeSH terms: Drug Resistance, Microbial
  2. Yong D, Tee KK, Yin WF, Chan KG
    Front Microbiol, 2016;7:1606.
    PMID: 27790203
    To date, information on plasmid analysis in Pandoraea spp. is scarce. To address the gap of knowledge on this, the complete sequences of eight plasmids from Pandoraea spp. namely Pandoraea faecigallinarum DSM 23572(T) (pPF72-1, pPF72-2), Pandoraea oxalativorans DSM 23570(T) (pPO70-1, pPO70-2, pPO70-3, pPO70-4), Pandoraea vervacti NS15 (pPV15) and Pandoraea apista DSM 16535(T) (pPA35) were studied for the first time in this study. The information on plasmid sequences in Pandoraea spp. is useful as the sequences did not match any known plasmid sequence deposited in public databases. Replication genes were not identified in some plasmids, a situation that has led to the possibility of host interaction involvement. Some plasmids were also void of par genes and intriguingly, repA gene was also not discovered in these plasmids. This further leads to the hypothesis of host-plasmid interaction. Plasmid stabilization/stability protein-encoding genes were observed in some plasmids but were not established for participating in plasmid segregation. Toxin-antitoxin systems MazEF, VapBC, RelBE, YgiT-MqsR, HigBA, and ParDE were identified across the plasmids and their presence would improve plasmid maintenance. Conjugation genes were identified portraying the conjugation ability amongst Pandoraea plasmids. Additionally, we found a shared region amongst some of the plasmids that consists of conjugation genes. The identification of genes involved in replication, segregation, toxin-antitoxin systems and conjugation, would aid the design of drugs to prevent the survival or transmission of plasmids carrying pathogenic properties. Additionally, genes conferring virulence and antibiotic resistance were identified amongst the plasmids. The observed features in the plasmids shed light on the Pandoraea spp. as opportunistic pathogens.
    Matched MeSH terms: Drug Resistance, Microbial
  3. Kemung HM, Tan LT, Khan TM, Chan KG, Pusparajah P, Goh BH, et al.
    Front Microbiol, 2018;9:2221.
    PMID: 30319563 DOI: 10.3389/fmicb.2018.02221
    Methicillin-resistant Staphylococcus aureus (MRSA) pose a significant health threat as they tend to cause severe infections in vulnerable populations and are difficult to treat due to a limited range of effective antibiotics and also their ability to form biofilm. These organisms were once limited to hospital acquired infections but are now widely present in the community and even in animals. Furthermore, these organisms are constantly evolving to develop resistance to more antibiotics. This results in a need for new clinically useful antibiotics and one potential source are the Streptomyces which have already been the source of several anti-MRSA drugs including vancomycin. There remain large numbers of Streptomyces potentially undiscovered in underexplored regions such as mangrove, deserts, marine, and freshwater environments as well as endophytes. Organisms from these regions also face significant challenges to survival which often result in the production of novel bioactive compounds, several of which have already shown promise in drug development. We review the various mechanisms of antibiotic resistance in MRSA and all the known compounds isolated from Streptomyces with anti-MRSA activity with a focus on those from underexplored regions. The isolation of the full array of compounds Streptomyces are potentially capable of producing in the laboratory has proven a challenge, we also review techniques that have been used to overcome this obstacle including genetic cluster analysis. Additionally, we review the in vivo work done thus far with promising compounds of Streptomyces origin as well as the animal models that could be used for this work.
    Matched MeSH terms: Drug Resistance, Microbial
  4. Yang Y, Mi J, Liang J, Liao X, Ma B, Zou Y, et al.
    Front Microbiol, 2019;10:2506.
    PMID: 31736928 DOI: 10.3389/fmicb.2019.02506
    Despite our continuous improvement in understanding the evolution of antibiotic resistance, the changes in the carbon metabolism during the evolution of antibiotic resistance remains unclear. To investigate the evolution of antibiotic resistance and the changes in carbon metabolism under antibiotic pressure, Escherichia coli K-12 was evolved for 38 passages under a concentration gradient of doxycycline (DOX). The 0th-passage sensitive strain W0, the 20th-passage moderately resistant strain M20, and the 38th-passage highly resistant strain E38 were selected for the determination of biofilm formation, colony area, and carbon metabolism levels, as well as genome and transcriptome sequencing. The MIC of DOX with E. coli significantly increased from 4 to 96 μg/ml, and the IC50 increased from 2.18 ± 0.08 to 64.79 ± 0.75 μg/ml after 38 passages of domestication. Compared with the sensitive strain W0, the biofilm formation amount of the resistant strains M20 and E38 was significantly increased (p < 0.05). Single-nucleotide polymorphisms (SNPs) were distributed in antibiotic resistance-related genes such as ribosome targets, cell membranes, and multiple efflux pumps. In addition, there were no mutated genes related to carbon metabolism. However, the genes involved in the biosynthesis of secondary metabolites and carbon metabolism pathway were downregulated, showing a significant decrease in the metabolic intensity of 23 carbon sources (p < 0.05). The results presented here show that there may be a correlation between the evolution of E. coli DOX resistance and the decrease of carbon metabolism, and the mechanism was worthy of further research, providing a theoretical basis for the prevention and control of microbial resistance.
    Matched MeSH terms: Drug Resistance, Microbial
  5. Lean SS, Yeo CC
    Front Microbiol, 2017;8:1547.
    PMID: 28861061 DOI: 10.3389/fmicb.2017.01547
    Acinetobacter baumannii is a Gram-negative nosocomial pathogen that has become a serious healthcare concern within a span of two decades due to its ability to rapidly acquire resistance to all classes of antimicrobial compounds. One of the key features of the A. baumannii genome is an open pan genome with a plethora of plasmids, transposons, integrons, and genomic islands, all of which play important roles in the evolution and success of this clinical pathogen, particularly in the acquisition of multidrug resistance determinants. An interesting genetic feature seen in majority of A. baumannii genomes analyzed is the presence of small plasmids that usually ranged from 2 to 10 kb in size, some of which harbor antibiotic resistance genes and homologs of plasmid mobilization genes. These plasmids are often overlooked when compared to their larger, conjugative counterparts that harbor multiple antibiotic resistance genes and transposable elements. In this mini-review, we will examine our current knowledge of these small A. baumannii plasmids and look into their genetic diversity and phylogenetic relationships. Some of these plasmids, such as the Rep-3 superfamily group and the pRAY-type, which has no recognizable replicase genes, are quite widespread among diverse A. baumannii clinical isolates worldwide, hinting at their usefulness to the lifestyle of this pathogen. Other small plasmids especially those from the Rep-1 superfamily are truly enigmatic, encoding only hypothetical proteins of unknown function, leading to the question of whether these small plasmids are "good" or "bad" to their host A. baumannii.
    Matched MeSH terms: Drug Resistance, Microbial
  6. Idris SB, Abdul Kadir A, Abdullah JFF, Ramanoon SZ, Basit MA, Abubakar MZZA
    Front Vet Sci, 2020;7:270.
    PMID: 32613011 DOI: 10.3389/fvets.2020.00270
    The development and utilization of nano-antibiotics is currently gaining attention as a possible solution to antibiotic resistance. The aim of this study was therefore to determine the pharmacokinetics of free oxytetracycline (OTC) and oxytetracycline loaded cockle shell calcium carbonate-based nanoparticle (OTC-CNP) after a single dose of intraperitoneal (IP) administration in BALB/c mice. A total of 100 female BALB/c mice divided into two groups of equal number (n = 50) were administered with 10 mg/kg OTC and OTC-CNP, respectively. Blood samples were collected before and post-administration from both groups at time 0, 5, 10, 15, and 30 min and 1, 2, 6, 24, and 48 h, and OTC plasma concentration was quantified using a validated HPLC-UV method. The pharmacokinetic parameters were analyzed using a non-compartment model. The Cmax values of OTC in OTC-CNP and free OTC treated group were 64.99 and 23.53 μg/ml, respectively. OTC was detected up to 24 h in the OTC-CNP group as against 1 h in the free OTC group following intraperitoneal administration. In the OTC-CNP group, the plasma elimination rate of OTC was slower while the half-life, the area under the curve, and the volume of the distribution were increased. In conclusion, the pharmacokinetic profile of OTC in the OTC-CNP group differs significantly from that of free OTC. However, further studies are necessary to determine the antibacterial efficacy of OTC-CNP for the treatment of bacterial diseases.
    Matched MeSH terms: Drug Resistance, Microbial
  7. Cheong LL, Chan RK, Nadarajah M
    Genitourin Med, 1992 Aug;68(4):260-2.
    PMID: 1328033
    To study the effectiveness of single-dose pefloxacin and ciprofloxacin in the treatment of uncomplicated gonococcal urethritis in males.
    Matched MeSH terms: Drug Resistance, Microbial
  8. Dillon JR, Bygdeman SM, Sandström EG
    Genitourin Med, 1987 Jun;63(3):160-8.
    PMID: 3111978
    One hundred and thirty eight penicillinase producing Neisseria gonorrhoeae (PPNG) and 239 non-PPNG strains were characterised serologically using a panel of seven monoclonal antibodies directed against protein 1A and seven against protein 1B. An association between serovar and susceptibility to antimicrobial agents, auxotype, and plasmid content was observed. Serogroup WI strains were more sensitive to penicillin, ampicillin, tetracycline, erythromycin, cefoxitin, and cefuroxime. Sixty five (82%) of the 79 WI strains were typed as being serovar Aedgkih, and 47 (72%) of these strains required arginine, uracil, and hypoxanthine for growth (AUH-). Seventy one (44%) of 160 WII/WIII strains were serovar Bacejk, and 42 (59%) of these required proline, citrulline, and uracil for growth (PCU-) and were plasmid free. Serovars Bcgk, Beghjk, Bacjk, and Bajk were associated with resistance to antimicrobial agents. Analysis of PPNG isolates showed a new serovar, Af, which was associated with strains imported from Malaysia and Singapore that required proline and ornithine for growth (Pro-Orn-) and carried the 24.5 megadalton transfer plasmid, the 2.6 megadalton cryptic plasmid, and the 4.5 megadalton penicillinase producing plasmid. Other associations between serovar and geographical location were noted.
    Matched MeSH terms: Drug Resistance, Microbial
  9. Teh AH, Lee SM, Dykes GA
    Genome Announc, 2016;4(3).
    PMID: 27151799 DOI: 10.1128/genomeA.00331-16
    Campylobacter jejuni is a frequent cause of human bacterial gastrointestinal foodborne disease worldwide. Antibiotic resistance in this species is of public health concern. The draft genome sequences of three multiantibiotic-resistant C. jejuni strains (2865, 2868, and 2871) isolated from poultry at retail outlets in Malaysia are presented here.
    Matched MeSH terms: Drug Resistance, Microbial
  10. Daniel DS, Gan HM, Lee SM, Dykes GA, Rahman S
    Genome Announc, 2017 Jun 15;5(24).
    PMID: 28619812 DOI: 10.1128/genomeA.00553-17
    Enterococcus faecalis is known to cause a variety of nosocomial infections, including urinary tract infections. Antibiotic resistance and virulence properties in this species are of public concern. The draft genome sequences of six E. faecalis strains isolated from clinical and environmental sources in Malaysia are presented here.
    Matched MeSH terms: Drug Resistance, Microbial
  11. Khan TM, Kok YL, Bukhsh A, Lee LH, Chan KG, Goh BH
    Germs, 2018 Sep;8(3):113-125.
    PMID: 30250830 DOI: 10.18683/germs.2018.1138
    Background: Burn victims admitted in burn intensive care units (ICU) are at a high risk of nosocomial infections generated by methicillin resistant Staphylococcus aureus (MRSA). This systematic review aims to estimate the incidence of MRSA among burn patients admitted to the ICU setting, with an emphasis on the incidence rate and antibiotic resistance profile of the MRSA strains.

    Methods: A systematic literature search was performed in five electronic databases limited to publication dates from 1st January 2000 until 31st August 2017. After screening n=481 articles, n=21 were found to meet the inclusion criteria of this systematic review.

    Results: Results from the meta-analysis revealed that the risk for MRSA isolates in the burn ICU was 55.0% higher (OR 0.55, 95%CI 0.32-0.94). Therefore, timely testing, appropriate hygiene practice and suggested wound care must be practiced while handling such patients.

    Conclusion: Further studies are needed to identify the risk factors of MRSA infections among burn patients and to develop new antimicrobial agents for MRSA infections.

    Matched MeSH terms: Drug Resistance, Microbial
  12. Lee Y, Wakabayashi M
    Global Health, 2013;9:34.
    PMID: 23889997 DOI: 10.1186/1744-8603-9-34
    The World Health Organization (WHO) selected antimicrobial resistance (AMR) as the theme for World Health Day 2011. The slogan was "Combat Drug Resistance - No action today, no cure tomorrow" A six-point policy package was launched as a core product for World Health Day. It aimed to stimulate extensive and coherent action to overcome the many challenges presented by antimicrobial resistance.
    Matched MeSH terms: Drug Resistance, Microbial*
  13. Nusrat T, Akter N, Rahman NAA, Godman B, D Rozario DT, Haque M
    Hosp Pract (1995), 2020 Aug;48(3):128-136.
    PMID: 32271642 DOI: 10.1080/21548331.2020.1754687
    BACKGROUND: Ventilator-associated pneumonia (VAP) is the most common nosocomial infection in intensive care units (ICU), accounting for 25% of all ICU infections. Antimicrobial resistance is increasing and becoming a significant health problem worldwide, increasing hospital length of stay, mortality and costs. Identifying antibiotic resistance patterns in VAP is important as this can cause outbreaks in ICUs. To date, there have been limited studies assessing this in Bangladesh. Consequently, the primary objective of this research was to study the species of bacterial growth and to determine the antibiotic resistance patterns of Metallo-β-Lactamase (MBL) producing gram-negative bacilli among ICU patients with VAP in a public medical school hospital, Bangladesh. In addition, identify the factors associated with a positive culture to provide future guidance.

    METHOD: Cross-sectional study performed in the Chattogram Medical College Hospital, Bangladesh. Mueller Hinton agar plates were used for antibiotic sensitivity testing by the Kirby-Buer disc diffusion test.

    RESULTS: Among 105 clinically suspected VAP cases, qualitative cultures were positive in 95 (90%) of them. The most common bacteria identified were Acinetobacter spp. (43.2%), Klebsiella spp. (20%) and Pseudomonas spp. (18.9%). A positive culture was not associated with patients' age or gender. Among 41 isolated Acinetobacter spp., 38 (92.7%) were resistant to gentamicin followed by 36 (87.8%) to ceftriaxone. Among 24 isolated Klebsiella spp., 22 (83.3%) were resistant to ceftriaxone. Among 18 isolated Pseudomonas spp., 16 (88.8%) were resistant to ciprofloxacin, and 13 (72.2%) were resistant to ceftriaxone. Among nine isolated E.coli, all were resistant to ceftriaxone and ciprofloxacin. All four Proteus spp. (100%) isolated were resistant to ciprofloxacin. Additionally, phenotype MBL producing was 65.22% and genotype was 45.65% among imipenem resistant pathogens. Imipenem resistant pathogens were sensitive to amoxyclav, amikacin¸ azithromycin, ceftazidime, ceftriaxone, colistin and gentamycin.

    CONCLUSION: A positive culture was detected in 90% of VAP patients, but it was not associated with the patients' age and gender. The most common bacteria identified were Acinetobacter spp., Klebsiella spp. and Pseudomonas spp., where the majority of these were resistant to ceftriaxone. The results are being used to provide future guidance on the empiric management of VAP in this hospital.

    Matched MeSH terms: Drug Resistance, Microbial*
  14. Marzan M, Islam DZ, Lugova H, Krishnapillai A, Haque M, Islam S
    Infect Drug Resist, 2021;14:519-533.
    PMID: 33603416 DOI: 10.2147/IDR.S289964
    Background: Antibiotics are lifesaving drugs, and inappropriate uses lead to the resistance that renders them ineffective. This study aims to understand knowledge, attitude, and practice (KAP) concerning antibiotic use and resistance among university students in Bangladesh.

    Methods: A cross-sectional study was performed from January to April 2020 among students at Jahangirnagar University (JU), Bangladesh. Purposive sampling was conducted through an in-person interview using a structured questionnaire. Students from the faculties of biological sciences and non-biology background were included. The univariate ordinal regression technique was used to analyze the relationship between predictors and good knowledge about the antibiotics. A two-tailed p-value was calculated to determine statistical association.

    Results: Out of 205 study participants, 92 and 113 responders were from biological science faculty and non-biology disciplines, respectively. Less than half of the students (42.4%) showed a good knowledge level (scores higher than 80%). Biology-background students possess better knowledge than non-biology students [odds ratio (OR) = 4.44, 95% confidence level (CL) (2.56, 7.70), p < 0.001]. A better attitude was noticed among all students. The self-medication rate was quite low, and more than 90% of students were found to consume antibiotics according to the physician's prescription. Lack of treatment adherence was recorded, and students admitted to stop-taking antibiotics when symptoms disappeared (48.67% biology and 36.26% non-biology). Multivariate regression analysis was unable to detect any significant association between self-medication and gender, student category or the level of knowledge about antibiotics.

    Conclusion: Students of biological science background possessed better knowledge indicating the importance of appropriate curriculum imparted in knowledge buildup. Introducing a short course about the risk and development of antibiotic resistance will grow the students' awareness to avoid the resistance phenomenon.

    Matched MeSH terms: Drug Resistance, Microbial
  15. Pearson JMH, Pettit JHS, Rees RJ
    PMID: 4877115
    Proof that a patient is suffering from sulfone-resistant leprosy depends on demonstrating that his bacilli can multiply in the mouse foot pad even when the mice are fed sulfone in the diet. Hitherto the maximal dose of DDS tolerated by the mouse has been used in such tests. This paper concerns a patient whose bacilli multiplied in mice fed lower doses of DDS, but were inhibited when the maximal dose was used . His clinical features are distinctive and probably characteristic of this type of "partial" resistance. It is likely that more cases of this type will be found . Recommendations are made concerning the investigation of possible DDS-resistant leprosy patients and their treatment.
    Matched MeSH terms: Drug Resistance, Microbial
  16. Pettit JHS, Rees RJW, Ridley DS
    Int. J. Lepr. Other Mycobact. Dis., 1966 Oct-Dec;34(3):375-90.
    PMID: 6006069
    From an extensive search of one of the largest inpatient leprosaria in the world, at Sungei Buloh, Malaysia, nine patients with lepromatous leprosy were discovered who gave prima facie evidence of sulfone resistance. The evidence was based on a failure to show clinical improvement over at least five years despite treatment with sulfones and an absence of a satisfactory fall in the bacteriologic (BI) or the morphologic (MI) index. The selected patients were admitted to our Research Unit for (a) a further six month, rigorously controlled, trial period on DDS (as injectable sulfone, 300 mgm. twice weekly) and (b) DDS sensitivity tests, based on use of the foot pad infection in mice with bacilli obtained from skin biopsies. The response of the nine patients to the six month trial period on DDS was assessed clinically, bacteriologically and histologically, and revealed that only four of the patients failed to respond satisfactorily. Furthermore, the sensitivity tests in the mouse foot pad infection showed that only the strains of M. leprae from the four patients who failed to improve were insensitive to DDS. Thus there was a good correlation between the results of the clinical and experimental studies and for the first time direct proof for the existence of DDS resistant strain s of M. leprae. The MI proved to be the most sensitive of the assessments used to determine the response of the selected patients to a trial period on DDS. The histology of patients with drug resistance is essentially that of relapsing or very acute leprosy. Its features have much in common with those of "histoid" lesions, the latter being distinguished mainly by the absence of cytologic maturation. Classification is complicated by the presence of borderline features in otherwise lepromatous lesions.
    Matched MeSH terms: Drug Resistance, Microbial*
  17. Pettit JHS, Rees RJW
    Int. J. Lepr. Other Mycobact. Dis., 1966 Oct-Dec;34(4):391-7.
    PMID: 6006070
    The first three patients with proven DDS-resistant leprosy infections were treated for one year with the riminophenazine
    derivative B.663 (300 mgm. daily for six days a week). All of them showed satisfactory clinical, bacteriologic and histologic
    improvement, which at the time of writing has been maintained for a total period of 28 months. The results show that
    active leprosy resulting from resistance to one drug can still respond satisfactorily to a different type of drug, as is the case with drug resistance in other bacterial infections. In this limited study B.663 showed no toxicity, but the degree of skin discoloration was disconcerting to Chinese patients.
    Matched MeSH terms: Drug Resistance, Microbial*
  18. MyJurnal
    A total of 49 isolates of V. parahaemolyticus and 8 isolates of V. cholerae isolated from freshwater fish of patin (Pangasius hypopthalmus) and red tilapia (Oreochromis sp.) were purchased from different retail level in Selangor, Malaysia. All of the isolates showed a multiple resistances towards all 15 antibiotics tested. Some of the isolates show a high resistance to different antibiotics including bacitracin, vancomycin, tetracycline, furazididone, cephalothin and erythromycin. However, both species was susceptible towards imipenem. Overall antibiotics resistance patterns of all isolates were resistant from 2 to 14 resistance patterns with multiple antibiotic resistance (MAR) index ranging from 0.13 to 0.93 respectively. As the results obtained in the dendrogram produced from both species had indicates that these antibiotics were intensively used whether in the aquaculture farm through feeds during culture or at the hatchery production of seed. Thus, this study will provides an essential information of the MAR index and also the clustering analysis in order to determine the biosafety of Vibrio spp. in freshwater aquaculture fish sold at different retail level in Malaysia.
    Matched MeSH terms: Drug Resistance, Microbial
  19. MyJurnal
    A total of sixty V. parahaemolyticus strains isolated from local cockles (Anadara granosa) were investigated by their antibiotic resistance patterns and plasmid profiles. The isolates showed multiple resistances towards most of the antibiotics tested. All strains of V. parahaemolyticus isolated harbored 1-3 plasmids, with sizes ranging from 2.7 to 54 kb. All V. parahaemolyticus strains showed high multiple antibiotics in frequencies of 0.58 – 0.94 indicating that the strains were derived from high-risk sources. In addition, no particular plasmid profile was predictive of a particular pattern of antibiotic susceptibility. These findings are essential because of the suggested involvement of seafood especially shellfish and environment in transmission of this pathogen to human. Thus, indicating that seafood may be a source of food- acquired antibiotic resistant bacteria to consumer.
    Matched MeSH terms: Drug Resistance, Microbial
  20. Tunung, R., Jeyaletchumi, P., Noorlis, A., Tang, Y.H., Sandra, A., Ghazali, F.M., et al.
    MyJurnal
    This study was undertaken to characterize the antibiotic resistance and randomly amplified polymorphic DNA (RAPD) profiles of Vibrio parahaemolyticus isolates from raw vegetable samples. A total of 46 isolates of V. parahaemolyticus recovered from raw vegetables samples and were confirmed by PCR were analyzed in this study. Most of the isolates were resistant to nalidixic acid (93.48%) and were the least resistant towards imipinem (4.35%). The MAR index results also demonstrated high individual and multiple resistances to antibiotics among the isolates. From the RAPD analysis, the size for RAPD fragments generated ranged from 250 bp to 1,500 bp, with most of the strains contained three major gene fragments of 350, 1,000 and 1,350 bp. The RAPD profiles revealed a high level of DNA sequence diversity within the isolates. Antibiotic resistance and RAPD proved to be effective tools in characterizing and differentiating the V. parahaemolyticus strains.
    Matched MeSH terms: Drug Resistance, Microbial
Filters
Contact Us

Please provide feedback to Administrator (afdal@afpm.org.my)

External Links