scholarly journals Detection of blaCTX-M gene among Pseudomonas aeruginosa isolated from water samples in Baghdad

2017 ◽  
Vol 28 (1) ◽  
pp. 35
Author(s):  
Saba R. Khdair
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Tap Water ◽  
Antibiotic Sensitivity ◽  
Penicillin G ◽  
Dilution Method ◽  
Agar Dilution Method ◽  
M Gene ◽  
Antibiotic Sensitivity Test ◽  
Agar Dilution ◽  
Esbl Producers

A total of 50 environmental Pseudomonas aeruginosa isolates were collected from sewage and tap water in Baghdad, Iraq. The MICs of Cefotaxime and Ceftazidime were determined by using agar dilution method, The MIC ranged from 2 to 256 µg/ml.The results of antibiotic sensitivity test showed that among sewage P. aeruginosa isolates, resistance was observed most often to Ticarcillin (92%), Penicillin G (84%), Ceftazidime (12%), (8%) for each of Cefotaxime and Ticarcillin. On the other hand, all tap water isolates were sensitive to Ofloxacin and Levofloxacin, Except (5%) of isolates were resistant to Cefotaxime (25%) to Ceftazidime and (95%) to Ticarcillin. All isolates were tested for Extended-Spectrum β-Lactamase (ESBL) production. Ten isolates (20%) were found to be ESBL producers. All environmental P. aeruginosa isolates were screened for the presence of the blaCTX-M genes by application PCR, Only (30%) of them were positive for this test.

scholarly journals Antibiotic sensitivities of Neisseria meningitidis isolates from patients and carriers in Greece

1992 ◽  
Vol 108 (3) ◽  
pp. 449-455 ◽  
Author(s):  
G. Tzanakaki ◽  
C. C. Blackwell ◽  
J. Kremastinou ◽  
C. Kallergi ◽  
G. Kouppari ◽  
...  
Keyword(s):  
Neisseria Meningitidis ◽  
School Children ◽  
Penicillin G ◽  
Dilution Method ◽  
Agar Dilution Method ◽  
Southern Europe ◽  
Agar Dilution ◽  
Of Greece

SUMMARYUsage of antibiotics in southern Europe is less well regulated than in northern countries. The proportion (48%) of meningococci in Spain insensitive to penicillin (MIC ≥ 0·1 mg/l) prompted this investigation of antibiotic sensitivities of isolates from Greek patients with meningitis (31) and carriers (47 school-children and 472 recruits). The agar dilution method was used to determine MIC to penicillin G (PN), sulphamethoxazole (SU), rifampicin (RF), cefaclor (CF) and ciprofloxacin (CP).The proportion of isolates insensitive to PN was 48% for isolates from patients, 19% from school-children and 36·6% from recruits. Resistance to SU (MIC ≥ 16 mg/l) was found in 16% of those from patients, 10·6% from children and 40% from recruits. None of the isolates from patients was resistant to RF (≥ 1 mg/l) but 6% of those from carriers were. Resistance to CF (≥ 4 mg/l) was found in 9·2% of patient isolates, 6·4% from children and 23·7% from recruits. All isolates except one were sensitive to CP (MIC range < 0·0015–0·125 mg/l).Resistances to PN, SU and RF were analysed by serogroup, serotype and subtype of the bacteria. The proportion of resistant isolates showed some variation between different areas of Greece, but it was not statistically significant.

scholarly journals In VitroActivity of Fosfomycin against a Collection of Clinical Pseudomonas aeruginosa Isolates from 16 Spanish Hospitals: Establishing the Validity of Standard Broth Microdilution as Susceptibility Testing Method

2013 ◽  
Vol 57 (11) ◽  
pp. 5701-5703 ◽  
Author(s):  
María Díez-Aguilar ◽  
María-Isabel Morosini ◽  
Rosa del Campo ◽  
María García-Castillo ◽  
Javier Zamora ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Susceptibility Testing ◽  
Disk Diffusion ◽  
Dilution Method ◽  
Agar Dilution Method ◽  
Broth Microdilution ◽  
Content Type ◽  
Testing Method ◽  
Broth Microdilution Method ◽  
Agar Dilution

ABSTRACTThe broth microdilution method for fosfomycin andPseudomonas aeruginosawas assessed and compared with the approved agar dilution method in 206 genetically unrelatedP. aeruginosaclinical isolates. Essential agreement between the two methods was 84%, and categorical agreement was 89.3%. Additionally, Etest and disk diffusion assays were performed. Results validate broth microdilution as a reliable susceptibility testing method for fosfomycin againstP. aeruginosa. Conversely, unacceptable concordance was established between Etest and disk diffusion results with agar dilution results.

Antimicrobial Susceptibility and Detection of Genes for Antimicrobial Resistance of Mycoplasma bovis, Staphylococcus aureus and Escherichia coli

2021 ◽  
Author(s):  
A. Aksoy
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Resistance ◽  
Antimicrobial Susceptibility ◽  
Penicillin G ◽  
Dilution Method ◽  
Agar Dilution Method ◽  
Mycoplasma Bovis ◽  
A Cell ◽  
Agar Dilution

Background: Mycoplasma bovis (Gram-positive bacteria) belongs the class Mollicutes and to the family Mycoplasmataceae (Maunsell and Donovan, 2009). It is a cell wall-less bacterium and are instead enveloped by a complex plasma membrane. In cattle, M. bovis is widely known causes various diseases, such respiratory disease, mastitis, arthritis and otitis.Methods: The present study was aimed to determine the antimicrobial susceptibility and identify the genes for antimicrobial resistance of Mycoplasma bovis PG45, Staphylococcus aureus and Escherichia coli. M. bovis PG45, S. aureus and E.coli were subjected to test for their sensitivity to various clinically important antibiotics (Cefotaxime, Cefuroxime, Cefaclor Cefalexin, Ofloxacin, Norfloxacin, Nalidixic acid, Amikacin, Ampicillin, Oxacilin, Amoxyclav, Rifampicin, Penicillin G and Tylosin). The minimal inhibitory concentration (MIC) of each antimicrobial agent was determined by applying an agar dilution method. Polymerase Chain reaction (PCR) was used to amplify specific DNA fragments and thus to determine the presence or absence of a target gene (VspA, tet k and tetA). Result: Showed the MIC values and the presence of VspA, tetK and tetA in M. bovis PG45, S. aureus and E. coli respectively.

scholarly journals Phenotypic and Molecular Detection of Extended-spectrum beta-lactamase among Ceftazidime Resistant Pseudomonas aeruginosa Isolated from Wound Swab.

2018 ◽  
Vol 12 (1) ◽  
pp. 15-19
Author(s):  
Sharmin Sultana ◽  
Shikha Paul ◽  
Akhtarun Naher ◽  
Rahima Akter ◽  
Tarina Khan
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Standard Procedure ◽  
Diffusion Method ◽  
Dilution Method ◽  
Agar Dilution Method ◽  
Disc Diffusion ◽  
College Hospital ◽  
Esbl Gene ◽  
Resistant Strains ◽  
Esbl Producers

ESBL producing Pseudomonas aeruginosa has been reported to be an important cause of nosocomial infection. The study was undertaken to determine ESBL producing Pseudomonas aeruginosa by phenotypic method and to detect bla OXA-10 ESBL gene by molecular method. A total of 288 wound infection cases attending the in-patient department of Mitford Hospital and Dhaka Medical College Hospital were enrolled for this study. Pseudomonas aeruginosa was isolated following standard procedure and subjected to antimicrobial susceptibility test by disc-diffusion method. Ceftazidime resistant strains were confirmed by MIC by agar dilution method. Confirmed ceftazidime resistant strains were tested for ESBL production by CLSI phenotypic confirmatory disc diffusion test (PCDDT) and bla OXA-10 ESBL gene was identified by employing conventional PCR. Out of 92 Pseudomonas aeruginosa, confirmed ceftazidime resistant strains were 60. PCDDT detected 49 (81.67%) ESBL producers and PCR detected 44 (73.33%) positive strains for bla OXA-10 ESBL gene among 60 ceftazidime resistant strains of Pseudomonas aeruginosa. The study showed high proportion of ESBL producers among ceftazidime resistant Pseudomonas aeruginosa. Bangladesh J Med Microbiol 2018; 12 (1): 15-19

scholarly journals Susceptibilities of bovine summer mastitis bacteria to antimicrobial agents.

1996 ◽  
Vol 40 (1) ◽  
pp. 157-160 ◽  
Author(s):  
H Jousimies-Somer ◽  
S Pyörälä ◽  
A Kanervo
Keyword(s):  
Antimicrobial Agents ◽  
Anaerobic Bacteria ◽  
Fusobacterium Necrophorum ◽  
Penicillin G ◽  
Dilution Method ◽  
Agar Dilution Method ◽  
Beta Lactamase ◽  
Bacterial Isolates ◽  
Amoxicillin Clavulanate ◽  
Agar Dilution

The susceptibility to 9 antimicrobial agents of 32 aerobic bacterial isolates and to 10 antimicrobial agents of 37 anaerobic bacterial isolates from 23 cases of bovine summer mastitis (16 Actinomyces pyogenes isolates, 8 Streptococcus dysgalactiae isolates, 3 S. uberis isolates, 3 S. acidominimus isolates, 2 Streptococcus spp., 15 Peptostreptococcus indolicus isolates, 10 Fusobacterium necrophorum isolates, and 12 isolates of anaerobic gram-negative rods) was determined by the agar dilution method. All isolates except one Bacteroides fragilis isolate (beta-lactamase producer) were susceptible to penicillin G, amoxicillin, amoxicillin-clavulanate, cefoxitin, clindamycin, and chloramphenicol (the B. fragilis strain was susceptible to the last four), which had MICs at which 90% of isolates were inhibited (MIC90s) of < or = 0.06, < or = 0.06, < or = 0.06 0.25, < or = 0.06, and 4.0 micrograms/ml, respectively. Spiramycin was active against the gram-positive aerobes (MIC90, 1.0 microgram/ml) but not against the anaerobes (MIC90, 16.0 micrograms/ml). Similar trends were noted for susceptibilities of aerobic and anaerobic bacteria to ofloxacin (MIC90s, 2.0 and 8 micrograms/ml, respectively). Occasional strains of aerobic streptococci were resistant to oxytetracycline, but all anaerobes were susceptible. Tinidazole was active against all anaerobes (MIC90, 2.0 micrograms/ml). beta-Lactamase was produced only by the B. fragilis isolate.

scholarly journals Summary and Trends of the Russian Gonococcal Antimicrobial Surveillance Programme, 2005 to 2016

2019 ◽  
Vol 57 (6) ◽  
Author(s):  
Alexey Kubanov ◽  
Viktoria Solomka ◽  
Xenia Plakhova ◽  
Aleksandr Chestkov ◽  
Natalya Petrova ◽  
...  
Keyword(s):  
Antimicrobial Resistance ◽  
Penicillin G ◽  
Dilution Method ◽  
Agar Dilution Method ◽  
Surveillance Program ◽  
Surveillance Programme ◽  
Content Type ◽  
Antimicrobial Surveillance ◽  
Agar Dilution ◽  
Chromosomal Mutations

ABSTRACT The Russian Gonococcal Antimicrobial Surveillance Programme (RU-GASP) was established in 2004 and operated continuously during the years from 2005 to 2016. The aims of this study were to summarize the RU-GASP results over this 12-year period and evaluate the trends in Neisseria gonorrhoeae antimicrobial resistance in Russia. In total, 5,038 verified N. gonorrhoeae isolates from 40 participating regions were tested for susceptibility to six antimicrobials via an agar dilution method. DNA loci involved in antimicrobial resistance were identified via minisequencing or DNA microarray techniques. From 2005 to 2016, increasing susceptibility to penicillin G (from 22.6% to 63.0%), tetracycline (from 34.8% to 53.0%), and ciprofloxacin (from 50.6% to 68.6%) was observed, but resistance to these drugs remained high. The proportions of isolates nonsusceptible to azithromycin and spectinomycin peaked in 2011 and decreased thereafter. Of the isolates, only 6 and 23 were identified as nonsusceptible to ceftriaxone according to the CLSI definitions and EUCAST breakpoint (0.57% of the total population), respectively. Comparison of N. gonorrhoeae antimicrobial resistance genetic determinants in 2005 versus those in 2016 showed a significant decrease in the number of isolates carrying chromosomal mutations. The proportion of isolates with wild-type genotypes increased from 11.7% in 2005 to 30.3% in 2016. Thus, the RU-GASP can be considered a successful gonorrhea surveillance program, and the current state of N. gonorrhoeae antimicrobial resistance in Russia is less serious than that in other WHO GASP regions.

Fluoroquinolone E-Testing against Pseudomonas Aeruginosa and Streptococcus Pneumoniae

2002 ◽  
Vol 18 (5) ◽  
pp. 241-247
Author(s):  
Eric G Sahloff ◽  
Benjamin P Smith ◽  
Steven J Martin
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Streptococcus Pneumoniae ◽  
Clinical Laboratory ◽  
Reference Method ◽  
Test Methods ◽  
National Committee ◽  
Dilution Method ◽  
Agar Dilution Method ◽  
Drug Activity ◽  
Agar Dilution

Objectives and Design: The use of fluoroquinolones has increased against antibiotic-resistant pathogens such as Streptococcus pneumoniae and Pseudomonas aeruginosa. The E-test (AB Biodisk, Solna, Sweden) is now commonly used for susceptibility testing of fluoroquinolones against these organisms. The purpose of the present study was to evaluate the accuracy and correlation of minimum inhibitory concentrations (MICs) determined by E-testing with a National Committee for Clinical Laboratory Standards reference standard, agar-dilution MIC testing. E-test and agar dilution MICs were compared for ciprofloxacin, levofloxacin, gatifloxacin, and moxifloxacin against clinical isolates of S. pneumoniae (n = 53) and P. aeruginosa (n = 62). Main Outcome Measures: MICs were determined by use of agar dilution and E-test methods. Essential agreement was defined as MICs from both methods within ± 1 log2 dilution. Categorical agreement compared MIC interpretations: susceptible, intermediate, or resistant. Categorical disagreement between methods was reported as very major, major, or minor errors. Results: E-tests produced lower MICs than the reference method for ciprofloxacin, gatifloxacin, and moxifloxacin versus P. aeruginosa. For S. pneumoniae, E-test MICs tended to be higher for all fluoroquinolones. The best correlation between testing methods was seen with levofloxacin. Essential agreement occurred more frequently with P. aeruginosa in the lower range of MICs and with S. pneumoniae in the higher range of MICs. Categorical agreement was greater than 90% for the 460 comparisons. Two very major errors (false-susceptible) occurred for gatifloxacin versus P. aeruginosa. Conclusions: For the determination of fluoroquinolone susceptibility against S. pneumoniae and P. aeruginosa, E-testing is a simple tool for clinical use, and few very major or major errors in susceptibility interpretation occur for either organism. For determining fluoroquinolone MICs, E-testing may overestimate drug activity against P. aeruginosa and underestimate drug activity versus S. pneumoniae compared with the agar dilution method. These differences could affect appropriate antimicrobial selection, leading to suboptimal outcomes.

scholarly journals Evaluation of the Antimicrobial Activity of Some Components of the Essential Oils of Plants Used in the Traditional Medicine of the Tehuacán-Cuicatlán Valley, Puebla, México

Antibiotics ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 295
Author(s):  
Sebastián Candelaria-Dueñas ◽  
Rocío Serrano-Parrales ◽  
Marisol Ávila-Romero ◽  
Samuel Meraz-Martínez ◽  
Julieta Orozco-Martínez ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Essential Oils ◽  
Qualitative Evaluation ◽  
Bactericidal Effect ◽  
Dilution Method ◽  
Agar Dilution Method ◽  
E Coli ◽  
Gram Positive Bacteria ◽  
Diffusion Technique ◽  
Agar Dilution

In Tehuacán-Cuicatlán valley (Mexico), studies have been carried out on the essential oils of medicinal plants with antimicrobial activity and it was found that they present compounds in common such as: α-pinene, β-pinene, carvacrol, eugenol, limonene, myrcene, ocimene, cineole, methyl salicylate, farnesene, and thymol. The goal of this study was to assess the antimicrobial activity of essential oils’ compounds. The qualitative evaluation was carried out by the Kirby Baüer agar diffusion technique in Gram-positive bacteria (11 strains), Gram-negative bacteria (18 strains), and yeasts (8 strains). For the determination of the minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), the agar dilution method was used. All the evaluated compounds presented antimicrobial activity. The compounds eugenol and carvacrol showed the largest inhibition zones. Regarding yeasts, the compounds ocimene, cineole, and farnesene did not show any activity. The compounds eugenol, carvacrol, and thymol presented the lowest MIC; bactericidal effect was observed at MIC level for S. aureus 75MR, E. coli 128 MR, and C albicans CUSI, for different compounds, eugenol, carvacrol, and thymol. Finally, this study shows that the essential oils of plants used by the population of Tehuacán-Cuicatlán valley share compounds and some of them have antibacterial and fungicidal activity.

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