A multiplexed nanoliter array-based microfluidic platform for quick, automatic antimicrobial susceptibility testing

Lab on a Chip ◽  
2021 ◽  
Author(s):  
Mohammad Osaid ◽  
Yi-Sin Chen ◽  
Chih-Hung Wang ◽  
Anirban Sinha ◽  
Wen-Bin Lee ◽  
...  
Keyword(s):  
Minimum Inhibitory Concentration ◽  
Antimicrobial Susceptibility ◽  
Susceptibility Testing ◽  
Inhibitory Concentration ◽  
Antimicrobial Susceptibility Testing ◽  
Bacterial Cells ◽  
Microfluidic Platform

A nanoliter array-based automatic microfluidic platform for performing rapid antimicrobial susceptibility testing using only ∼2000 bacterial cells was reported, and required 8–9 hours to determine the minimum inhibitory concentration value.

An automated and portable antimicrobial susceptibility testing system for urinary tract infections

Lab on a Chip ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 755-763
Author(s):  
Kuo-Wei Hsu ◽  
Wen-Bin Lee ◽  
Huey-Ling You ◽  
Mel S. Lee ◽  
Gwo-Bin Lee
Keyword(s):  
Urinary Tract ◽  
Minimum Inhibitory Concentration ◽  
Urinary Tract Infections ◽  
Antimicrobial Susceptibility ◽  
Susceptibility Testing ◽  
Inhibitory Concentration ◽  
Microfluidic System ◽  
Antimicrobial Susceptibility Testing ◽  
Testing System ◽  
Tract Infections

A portable, integrated microfluidic system capable of automatically conducting antimicrobial susceptibility testing (AST) and minimum inhibitory concentration (MIC) measurements using urine samples were developed.

scholarly journals Susceptibility profile of Brazilian Rhodococcus equi isolates against azithromycin, clarithromycin and erythromycin

2015 ◽  
Vol 45 (4) ◽  
pp. 680-683
Author(s):  
Letícia Trevisan Gressler ◽  
Bibiana Petri da Silveira ◽  
Marcelo Luís Schwab ◽  
Agueda Castagna de Vargas ◽  
Luciana Pötter ◽  
...  
Keyword(s):  
Minimum Inhibitory Concentration ◽  
Antimicrobial Susceptibility ◽  
Susceptibility Testing ◽  
Inhibitory Concentration ◽  
Rhodococcus Equi ◽  
Antimicrobial Susceptibility Testing ◽  
Microbiological Culture ◽  
Infection Treatment

Rhodococcus equi infection treatment is usually a macrolide (azithromycin - AZM, clarithromycin - CLR and erythromycin - ERY) and rifampicin combination. However, resistance cases have been reported, especially for ERY. In view of the need of a study about Brazilian isolates susceptibility profile, this study aimed to characterize the minimum inhibitory concentration (MIC) of the macrolides - AZM, CLR and ERY - against 44 R. equi isolates. It was found all isolates CLR and AZM sensitive; however, for ERY, 27% (12/44) were classified as intermediate sensitivity. R. equi Brazilian isolates used here showed a large susceptibility profile, except against ERY, for which it was observed some resistance evidence. In order to avoid failures in the equine rhodococcosis therapy it was highlighted the importance of microbiological culture and antimicrobial susceptibility testing in vitro before beginning treatment

scholarly journals Detection of Antibiotic Susceptibility by Colorimetric Minimum Inhibitory Concentration in Staphylococcal Isolates

QJM ◽  
2020 ◽  
Vol 113 (Supplement_1) ◽  
Author(s):  
B S Mahmoud ◽  
S A ElMasry ◽  
N A Fahim ◽  
O A Shaker ◽  
M A Abdelsattar
Keyword(s):  
Minimum Inhibitory Concentration ◽  
Antimicrobial Susceptibility ◽  
Antibiotic Susceptibility ◽  
Susceptibility Testing ◽  
Inhibitory Concentration ◽  
Antimicrobial Susceptibility Testing ◽  
Bacterial Concentration ◽  
Tetrazolium Chloride ◽  
Wide Range ◽  
Agar Dilution

Abstract Background Staphylococcus species are implicated in a wide range of community and hospital-acquired infections, which necessitates rapid provision of antibiotic susceptibility results for patients at risk. The current study evaluated the usefulness of applying broth microdilution (BMD) and agar dilution methods for antimicrobial susceptibility testing of Staphylococci using tetrazolium salts as redox indicators. Methods Minimum inhibitory concentration (MICs) of eight antimicrobials representing different antibiotic classes as recommended by CLSI; vancomycin (VA), linezolid (LZD), oxacillin (OX), gentamicin (CN), tetracycline (TE), ciprofloxacin (CIP), erythromycin (E) and clindamycin (DA) was investigated for 80 isolates of Staphylococci by a modified BMD with the addition of dimethyl thiazole diphenyl tetrazolium bromide (MTT). As well as agar dilution with the addition of MTT & triphenyl tetrazolium chloride (TTC) at the standard bacterial concentration together with addition of MTT at an experimental bacterial concentration. Results BMD (MTT) showed the highest agreement regarding most antibiotics among different isolates in comparison with the standard BMD. All performed methods showed significant agreement except agar dilution (TTC) using TE, DA, E, and agar dilution (MTT 108) using DA as well as agar dilution (MTT 104) using E among S. aureus. Conclusions Colorimetric BMD was rapid, easy to interpret and showed the highest agreement with the standard BMD. Colorimetric agar dilution (MTT) was less tedious than BMD. The colorimetric MIC method using MTT may be a useful surrogate of antimicrobial susceptibility testing among Staphylococcus isolates.

scholarly journals Antimicrobial Susceptibility Testing of Metronidazole and Clindamycin against Gardnerella vaginalis in Planktonic and Biofilm Formation

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Ting Li ◽  
Zhan Zhang ◽  
Fengjuan Wang ◽  
Yuanhui He ◽  
Xiaonan Zong ◽  
...  
Keyword(s):  
Minimum Inhibitory Concentration ◽  
Antimicrobial Susceptibility ◽  
Susceptibility Testing ◽  
Inhibitory Concentration ◽  
Resistance Rate ◽  
Antimicrobial Susceptibility Testing ◽  
Clinical Isolates ◽  
Lower Resistance ◽  
Antimicrobial Susceptibilities ◽  
Susceptibility Rate

Background. Bacterial vaginosis (BV), one of the most common vaginal ecosystem-related microbiologic syndromes, is the most common disorder in women of reproductive age. Gardnerella (G.) vaginalis is the predominant species causing this infection. Our aim was to compare the antimicrobial susceptibilities of metronidazole and clindamycin against G. vaginalis at planktonic and biofilm levels. Methods. From September 2019 to October 2019, we recruited a total of 10 patients with BV who underwent gynecological examinations at Beijing Obstetrics and Gynecology Hospital. G. vaginalis isolates were obtained from the vagina and identified using their characteristic colony morphology. Sequence data of clinical G. vaginalis isolates were confirmed by comparing 16S rDNA sequences. Subsequently, clinical isolates were evaluated for antimicrobial susceptibilities in vitro to metronidazole and clindamycin at planktonic and biofilm levels. The minimum inhibitory concentration (MIC) for metronidazole and clindamycin was evaluated by antimicrobial susceptibility testing. The minimum biofilm eradication concentration (MBEC) was evaluated by the biofilm inhibition assay. Results. Planktonic clinical isolates showed a significantly higher susceptibility rate (76.67%) and lower resistance rate (23.33%) to clindamycin than to metronidazole (susceptibility rate: 38.24%; resistance rate: 58.82%; P<0.05 for both). Furthermore, in comparison to planktonic isolates, the minimum inhibitory concentration (MIC) of metronidazole was significantly higher for biofilm-forming isolates (7.3 ± 2.6 μg/mL vs. 72.4 ± 18.3 μg/mL; P=0.005); the resistance rate was 27.3%, and the minimum biofilm eradication concentration (MBEC) was >128 μg/mL. Moreover, the MIC of clindamycin was higher too for biofilm-forming isolates (0.099 ± 0.041 μg/mL vs. 23.7 ± 9.49 μg/mL; P=0.034); the resistance rate was 27.3%, and the MBEC of clindamycin was 28.4 ± 6.50 μg/mL. Conclusion. Our results indicate that in comparison to metronidazole, clindamycin seems to be a better choice to tackle G. vaginalis as it exhibits a relatively higher susceptibility rate and lower resistance rate.

scholarly journals Renaissance of Conventional First-Line Antibiotics inSalmonella entericaClinical Isolates: Assessment of MICs for Therapeutic Antimicrobials in Enteric Fever Cases from Nepal

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Puspa Raj Khanal ◽  
Deepa Satyal ◽  
Anjeela Bhetwal ◽  
Anjila Maharjan ◽  
Shreena Shakya ◽  
...  
Keyword(s):  
Minimum Inhibitory Concentration ◽  
Antimicrobial Susceptibility ◽  
Salmonella Enterica ◽  
Enteric Fever ◽  
Susceptibility Testing ◽  
Inhibitory Concentration ◽  
Antimicrobial Susceptibility Testing ◽  
Clinical Isolates ◽  
Disk Diffusion ◽  
Blood Samples

Enteric fever caused bySalmonella entericais a life-threatening systemic illness of gastrointestinal tract especially in tropical countries. Antimicrobial therapy is generally indicated but resistance towards commonly used antibiotics has limited their therapeutic usefulness. Therefore, we aimed to determine the antimicrobial susceptibility pattern by minimum inhibitory concentration method of common therapeutic regimens againstSalmonella entericafrom enteric fever clinical cases.Salmonella entericaclinical isolates recovered from the patients with suspected enteric fever whose blood samples were submitted to microbiology laboratory of Manmohan Memorial Community Hospital, Kathmandu, from March 2016 to August 2016, were studied. These isolates were subjected to antimicrobial susceptibility testing against common therapeutic antimicrobials by Kirby-Bauer disk diffusion method. The minimum inhibitory concentration of ciprofloxacin, azithromycin, chloramphenicol, and cefixime was determined by Agar dilution method based on the latest CLSI protocol. A total of 88 isolates ofSalmonella entericawere recovered from blood samples of enteric fever cases. Out of them, 74 (84.09%) wereSalmonellaTyphi and 14 (15.91%) wereSalmonellaParatyphi A. On Kirby-Bauer disk diffusion antimicrobial susceptibility testing, entire isolates were susceptible to cotrimoxazole, cefixime, ceftriaxone, azithromycin, and chloramphenicol. Sixty-four (72.7%)Salmonella entericaisolates were nalidixic acid resistant and nonsusceptible to ciprofloxacin and levofloxacin. On MIC determination, fourSalmonellaisolates were ciprofloxacin resistant with MIC 1 µg/ml and two isolates were ciprofloxacin intermediate with MIC 0.5 µg/ml. The MIC range of azithromycin was from 0.125 µg/ml to 2.0 µg/ml, whereas that for chloramphenicol was 2.0 µg/ml–8.0 µg/ml and for cefixime was 0.0075–0.5 µg/ml, respectively. Despite global surge of antimicrobial resistance amongSalmonella entericaclinical isolates, the level of drug resistance in our study was not so high. However, higher level of NARST strains limits therapeutic use of fluoroquinolones and necessitates the routine monitoring of such resistance determinants in order to effectively and rationally manage enteric fever cases.

scholarly journals Recent Development of Rapid Antimicrobial Susceptibility Testing Methods through Metabolic Profiling of Bacteria

Antibiotics ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 311
Author(s):  
Chen Chen ◽  
Weili Hong
Keyword(s):  
Antimicrobial Susceptibility ◽  
Metabolic Profiling ◽  
Bacterial Infections ◽  
Susceptibility Testing ◽  
Antimicrobial Susceptibility Testing ◽  
Bacterial Metabolism ◽  
Resistant Bacteria ◽  
Bacterial Cells ◽  
Inappropriate Use ◽  
Key Factor

Due to the inappropriate use and overuse of antibiotics, the emergence and spread of antibiotic-resistant bacteria are increasing and have become a major threat to human health. A key factor in the treatment of bacterial infections and slowing down the emergence of antibiotic resistance is to perform antimicrobial susceptibility testing (AST) of infecting bacteria rapidly to prescribe appropriate drugs and reduce the use of broad-spectrum antibiotics. Current phenotypic AST methods based on the detection of bacterial growth are generally reliable but are too slow. There is an urgent need for new methods that can perform AST rapidly. Bacterial metabolism is a fast process, as bacterial cells double about every 20 to 30 min for fast-growing species. Moreover, bacterial metabolism has shown to be related to drug resistance, so a comparison of differences in microbial metabolic processes in the presence or absence of antimicrobials provides an alternative approach to traditional culture for faster AST. In this review, we summarize recent developments in rapid AST methods through metabolic profiling of bacteria under antibiotic treatment.

Method Preferences and Test Accuracy of Antimicrobial Susceptibility Testing

2001 ◽  
Vol 125 (10) ◽  
pp. 1285-1289 ◽  
Author(s):  
Ronald N. Jones
Keyword(s):  
Quality Control ◽  
Minimal Inhibitory Concentration ◽  
Antimicrobial Susceptibility ◽  
Susceptibility Testing ◽  
Inhibitory Concentration ◽  
Antimicrobial Susceptibility Testing ◽  
Disk Diffusion ◽  
Diffusion Method ◽  
Quantitative Accuracy ◽  
Concentration Methods

Abstract Objective.—To summarize the antimicrobial susceptibility testing results from the College of American Pathologists (CAP) Microbiology Surveys Program for 2000. Specifically, the frequency of tests used and the quantitative and qualitative (susceptibility category) accuracy were assessed. Design.—The CAP Microbiology Surveys challenged subscribers in 2000 with 3 well-characterized organisms for antimicrobial susceptibility testing in pure culture. Each laboratory was to use the test method and reporting procedures routinely applied to patient samples. The strains were National Committee for Clinical Laboratory Standards (NCCLS) quality control organisms with precisely defined antimicrobial susceptibility patterns and reproducibility. Results reported by participants (2685–2979/sample) were graded for categorical accuracy and quantitative performance by comparing reported minimal inhibitory concentrations (μg/mL) or zone diameters (mm) against quality control ranges published by the NCCLS. The appropriateness of reported drugs was determined in the context of the type and anatomic location of the infection. Results.—The tests most often used varied by the species of the organism and growth characteristics of the isolated strains. Nonfastidious, rapid-growing Surveys unknowns (Escherichia coli ATCC 25922, Pseudomonas aeruginosa ATCC 27853) were most often tested with commercial systems (MicroScan, 42.0%–42.4%; Vitek, 41.5%–43.0%) or with the standardized disk diffusion method (12.8%–13.9%). In contrast, fastidious species, such as Streptococcus pneumoniae (ATCC 49619), were predominantly tested by Etest (40.3%), followed by disk diffusion (27.6%) and MicroScan (23.2%). Categorical accuracy was essentially equal between dilution (98.9%) and diffusion (99.0%) methods. Among the minimal inhibitory concentration methods used to test penicillin against S pneumoniae, Etest method quantitative accuracy (96.3%) was greater than that of MicroScan (92.4%). Quantitative accuracy was greatest for dilution minimal inhibitory concentration methods, with more than 90% of results within NCCLS quality control ranges for nearly all reported antimicrobials. Reevaluations of quality control ranges may be needed for 4 to 7 agents, depending on method. Reporting errors were also detected in 2 areas: (1) reporting results for drugs not active at the site of infection and (2) reporting results for drugs tested with suboptimal methods without published NCCLS interpretive criteria. Conclusions.—Antimicrobial susceptibility testing methods used in US laboratories were dominated by commercial products with relatively high accuracy (qualitative and quantitative). As available methods have become better suited to both fastidious and rapid-growing species, reporting errors have assumed a higher level of concern to the CAP Surveys in an effort to minimize prescription errors.

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