International Journal of Current Research and Review
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IJCRR - 8(11), June, 2016

Pages: 10-14

Date of Publication: 11-Jun-2016


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COMPARISON OF DIFFERENT PHENOTYPIC METHODS FOR THE DETECTION OF EXTENDED SPECTRUM b- LACTAMASE (ESBL) IN BACTERIAL ISOLATES FROM TERTIARY CARE CENTRE

Author: Shaikh N. K., Mundhada S. G., Lalngaihzuali R., Ingole K. V.

Category: Healthcare

Abstract:Background and objective: Extended spectrum \? lactamases (ESBLs) continue to be a major problem in clinical setups. Their detection is essential for proper antibiotic therapy, to limit the spread of resistance mechanisms and for epidemiological purposes. The objective of our study was to compare different phenotypic methods for detection of ESBL to know the best suitable one in our setup.
Material and method: A total of 127 Gram negative isolates were identified by standard protocol and Antibiotic susceptibility testing (AST) was done. Isolates which were resistant to one of the third generation cephalosporins were selected provisionally as ESBL producers and then subjected for confirmation by Phenotypic confirmatory disc diffusion test (PCDDT), Double disk synergy tests, Modified double disk synergy test (MDDST), Indirect modified three dimensional test (IMTDT) to evaluate their ability to detect ESBLs. Minimal inhibitory concentration (MIC) by the agar dilution method was used as the standard reference method.
Result: MIC detection by agar dilution method had confirmed all 63(49.60%) screening positive isolates as ESBL producers. E.coli which constitute 39(61.90%) of the isolates was found to be highest ESBL producer among them. PCDDT by CLSI detected ESBL in 55(87.30%) isolates. DDST using amoxicillin-clavulanic acid detected the same in 49 (77.78%) cases. MDDST using cefepime and piperacillin-tazobactam detected ESBL in 60(95.23%) cases. IMTDT detected 62(98.41%) ESBL producing isolates.
Conclusion: IMTDT was found to be superior method than MDDST, PCDDT and DDST for detection of production of ESBL alone or in presence of other \?- lactamases like Amp C.

Keywords: Amp C, DDST, ESBL, IMTDT, MDDST, PCDDT

Full Text:

INTRODUCTION
The most common cause of bacterial resistance to β-lactam antibiotics is the production of enzyme β-lactamases. Over the last 20 years, many new β-lactam antibiotics have been developed which were specifically designed to resist to the hydrolytic action of β-lactamases. However, with each new class that has been used to treat patients, new β-lactamases emerged that caused resistance to that class of drug.1 The latest in the series of these enzymes is the evolution of Extended Spectrum Beta Lactamases (ESBLs) due to extensive use of 3rd generation cephalosporins. These ESBLs efficiently hydrolyze oxyimino cephalosporins conferring resistance to third generation cephalosporins and to monobactams.2 Plasmids coding for ESBLs may also carry additional β-lactamase genes as well as genes conferring resistance to other antimicrobial such as quinolones, aminoglycosides and sulphonamides. This can limit the chemotherapeutic options for ESBL-producing pathogens and facilitate the inter and intraspecies dissemination of ESBLs.3

Considering the increasing rate of infections caused by ESBL producing organism, their detection is essential for prescribing appropriate antibiotic therapy, to limit the spread of resistance mechanisms and for epidemiological purposes. Various methods like phenotypic (disk diffusion, disk potentiation, double disk synergy procedure, three dimensional test and E- test ESBL strip), semi-automated [Phoenix Automated Microbiology System (BD Diagnostic Systems, Sparks, MD), the VITEK 2 System (bioMe´rieux, Marcy l’Etoile, France), and the MicroScan Walk Away-96 System (Dade Behring, Inc., West Sacramento, CA)] and molecular methods (PCR, PCR-RFLP and nucleotide sequencing) have been described for ESBL detection; however, each method has its own limitations.4 In the present study, we compared different phenotypic methods for detection of ESBL to know the best suitable one in our setup.

MATERIAL AND METHOD
The present study was carried out at a tertiary care centre in the Microbiology department from September 2015 to February 2016. Total 127gram negative bacteria were isolated from various samples including blood, pus, surgical site wounds, burn wounds, tracheal aspirates, central venous pressure tips and urine. Identification of isolates was done based on cultural characteristics and reaction in standard biochemical tests.5, 6 Antimicrobial sensitivity testing was done by the Kirby-Bauer disc diffusion method.7 ESBL detection was done in those Gram negative isolates which revealed resistance/decrease susceptibility to 3rd generation Cephalosporin i.e. Ceftazidime (30ug) or Cefotaxime (30ug) or both according to CLSI guideline (Screening test).Detection of minimum inhibitory concentration (MIC) by the agar dilution technique for 3rd generation cephalosporins with and without clavulanic acid in accordance to CLSI guidelines- 7 was taken as standard reference method for comparison purpose with different phenotypic method for detection of ESBL as given below. 1. Phenotypic confirmatory disc diffusion test (PCDDT)7 – It is performed according to CLSI guideline. Ceftazidime (30 µg) discs alone and in combination with clavulanic acid (ceftazidime + clavulanic acid, 30/10 µg discs) were placed on a Muller Hinton agar (MHA)plate which was inoculated with the test strain. An increase of ≥ 5mm in the zone of inhibition of the combination discs in comparison to the ceftazidime disc alone was considered to be an ESBL producer. 2. Double disk synergy test (disk approximation test)8 - MHA plate was inoculated with test strain. Augmentin (20μg amoxicillin + 10μg clavulanic acid) disc was place in centre of plate. Disc of cefpodoxime (30μg), ceftazidime (30μg) and cefotaxime (30μg) were placed 15-20 mm (centre to centre) around augmentin disc. Enhancement in zone of inhibition of any cephalosporin toward augmentin indicated presence of ESBL producing organism. 3. Modified double disk synergy test (MDDST)8 - The original double disk synergy test was modified for detecting ESBL in AmpC producing clinical isolates. A disc of augmentin was placed in the centre of MHA; then discs of cefpodoxime (30μg), ceftazidime (30μg), cefotaxime (30μg), aztreonam (30ug) and cefepime (30μg) were kept 16 to 20 mm (centre to centre) around augmentin disc. From the cefepime disc at a distance of 22 to 25 mm centre to centre disc of piperacillin-tazobactam (100/10μg) was placed. The organisms were considered to be ESBL producer when the zone of inhibition around cefepime or any of the extended-spectrum cephalosporin discs showed a clear-cut increase towards the piperacillin-tazobactam (PIT) disc or augmentin disc. 4. Indirect modified three dimensional test (IMTDT)9 - MHAplate was inoculated with standard sensitive strain (E. coli ATCC 25922) matching 0.5 McFarland turbidity standards. A disc of 3rd generation cephalosporin (ceftazidime/ceftriaxone/cefotaxime) or aztreonam was placed in the centre of the plate. At a distance of 2 mm from the antibiotic disc a well of 4 mm (diameter) was punched and inoculum (30µL) of the test strain preadjusted to 5.0 McFarland standards was seeded into the well. Heart shaped distortion of zone of inhibition around the β -lactam disc was indicative of an ESBL production. Quality control -Klebsiella pneumonia ATCC 700603 and Escherichia coli ATCC 25922 were used as ESBL positive and negative controls, respectively. RESULT Among the 127 gram negative bacteria isolated, 63(49.60%) were resistant or revealed decreased susceptibility to 3rd generation cephalosporin on screening giving provisional diagnosis of ESBL. All screening positive 63 isolates were confirmed as ESBL producers by standard reference method. (MIC detection by the agar dilution technique)ESBL production was seen highest in E.coli isolates 39(61.90%) followed by Klebsiella pneumonia, Pseudomonas aeruginosa, Proteus species, Citrobacter species and Acinetobacter species. (Table I) Antibiotic Resistance pattern of ESBL producing isolates is as shown in Table II. Imipenem, Pipracillin-Tazobactam and Amikacin were found to be most sensitive antibiotic while maximum resistance was observed against cefotaxime, ceftazidime, Trimethoprim-sulfamethoxazole and Tetracycline. Prevalence of ESBL production in different isolates in present study was detected by various phenotypic methods. Table III shows evaluation of these phenotypic methods in comparison to reference standard method (MIC detection by Agar dilution). Int J Cur Res Rev | Vol 8 • Issue 11 • June 2016 12 Shaikh et.al.: Comparison of different phenotypic methods for the detection of extended spectrum b- lactamase (ESBL)... DISCUSSION The prevalence of ESBL among gram negative bacteria constitutes a serious threat to current β lactam therapy leading to treatment failure and consequent escalation of costs of hospital stay. Many clinical laboratories are not fully aware of the importance of the ESBL producers and of methods to detect them. This lack of understanding is responsible for a continuing failure to respond appropriately to prevent the rapid, worldwide dissemination of the pathogens which possess these β-lactamases. Hence, ESBL detection must be efficient to aid in formulating an antibiotic policy and containment measures to solve the issue of antibiotic resistance.10 Previous studies from India have reported the prevalence of the ESBL producers to be 6.6 to 68%.11, 12, 13, 14 In the present study 49.60 % of gram negative bacteria were ESBL producers. E.coli was the predominant ESBL producer in our study. Similar finding were reported by Kulkarni et al and Ananthakrishanan et al.15, 16We observed that a majority of the isolates in our study were susceptible to imipenem (100%),Amikacin (77.77%) and piperacillin-tazobactum (73.02%). Studies by Dalela et al 17 and Baby et al18 also observed similar result. We observed that imipenem is the most active drug for the treatment of infections caused by ESBL producers, followed by Amikacin and piperacillin/tazobactam. These drug should be used as reserved one, their indiscriminate use should be minimize to prevent emergence of resistance. Different methods were used in present study for detection of ESBL production. PCDDT, theconfirmatory method recommended by CLSI had detected ESBL production in 87. 30% of isolates. While DDST, using Amoxiclav as inhibitor of ESBL showed positive result in 77.78% of isolates. In present study between these two tests, PCDDT was more sensitive than DDST. Similar finding were observed in other studies by Khan et al and Modi et al.8, 9 Sensitivity of both PCDDT and DDST were less compared to standard reference test because Clavulanic acid which was used as ESBL inhibitor in PCDDT and DDST act as inducers of high level AmpC production and it led to resistance to 3rd generation cephalosporins as well 3rd generation cephalosporins + clavulanic acid. So even if ESBL was present, it would not be detected and resulted in false negative test.9 For MDDST, few modifications were done in DDST like addition of piperacillin- tazobactam as ESBL inhibitor, use of 4th generation cephalosporins(Cefepime) and optimum spacing of drugs for detection of synergy. If AmpC was present, cefepime would be sensitive so synergy could be seen with 4th generation cephalosporins and inhibitor antibiotic.8 Tazobactam and sulbactam were less likely to induce AmpC B-lactamase compared to clavulanic acid. So, simultaneous Amp C induction did not occur. In present study, MDDST had detected 60(95.23%) isolates which is 11 isolates more than detected by DDST. MDDST found to be more sensitive than DDST and PCDDT in our study. These finding can be correlated with observation made by Modi et al9 in their study. In present study, IMTDT identified 62(98.41%) ESBL positive isolates. Thus it was the most sensitive test among all other tests. It was superior in detecting ESBL than PCDDT, DDST and MDDST in our study. Other studies carried out by Menon et al19 and Modi et al9 also reported similar observations. Thus, PCDDT and DDST should be used in the isolates which produce only ESBL but are not useful for detection of ESBL in isolates who also produces other β-lactamases like AmpC enzyme. While MDDST due to modification in it and IMTDT had showed good sensitivity when compared to standard reference method.

CONCLUSION
Infections caused by ESBL producers often limit therapeutic options and cause treatment failures. Thus, detection of ESBL production should be perform routinely in microbiology laboratories so that the appropriate antimicrobial therapy can be instituted and the dissemination of ESBL producers may be prevented by employing appropriate infection control measures. It is important to increase awareness of among physician about ESBL producers and different methods available to detect them. Molecular assays may provide accurate results in the identification of ESBL genes, but their accessibility is often limited and they are expensive. Phenotypic methods are easy to perform and interpret. In our study, IMTDT was found to be superior method than MDDST, PCDDT and DDST for detection of production of ESBL alone or in presence of other β- lactamases like AmpC.

ACKNOWLEDGEMENT
Authors acknowledge the immense help received from the scholars whose articles are cited and included in references of this manuscript. The authors are also grateful to authors / editors / publishers of all those articles, journals and books from where the literature for this article has been reviewed and discussed.

Source of Funding – Nil
Conflict of interest- Nil

References:

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4. Goyal A, Prasad A, Ghoshal U, Prasad K. Comparison of disk diffusion, disk potentiation and double disk synergy methods for detection of extended spectrum beta lactamases in Enterobacteriaceae.Indian J Med Res 2008:209-211 5. Forbes BA, Sahm DF, Weissfeld AS. Overview of bacterial identification methods and strategies. Bailey and Scott’s Diagnostic Microbiology. 12th ed. Missouri: Mosby Elsevier; 2007. p. 218- 47.

6. Collee JG, Miles RS, Watt B. Tests for identification of bacteria. In: Colle JG, Fraser AG, Marimon BP, Simmons A, editors. Mackie and McCartney Practical Medical Microbiology. 14th ed. Edinburg: Elsevier Churchill Livingstone; 2006. p. 131-149.

7. Performance Standards for Antimicrobial Susceptibility Testing; Twenty-fifth Informational Supplement. CLSI document M100- S25. Wayne, PA: Clinical and Laboratory Standards Institute; 2015.

8. Khan M, Thukral S, Gaind R. Evaluation of a Modified Double-Disc Synergy Test for Detection of Extended Spectrum Β-Lactamases in Ampc Β-Lactamase-Producing Proteus mirabilis. Indian Journal of Medical Microbiology, (2008). Pg. 58- 61

9. Modi D, Patel D, Patel S, Jain M, Bhatt S, Vegad M. Comparison of various methods for the detection of extended spectrum beta lactamase in klebsiella pneumoniae isolated from neonatal intensive care unit, Ahmedabad. National journal of medical research 2012;2(3):348-53.

10. Krishnamurthy V, Vijay Kumar G, Sudeepa Kumar M, Prashanth H, Prakash R, Nagaraj E. Phenotypic and Genotypic Methods for Detection of Extended Spectrum β Lactamase Producing Escherichia coli and Klebsiella pneumoniae Isolated from Ventilator Associated Pneumonia.Journal of Clinical and Diagnostic Research 2013;7(9): 1975-78.

11. Subha A, Ananthan S. Extended-spectrum β-lactamase (ESBL) mediated resistance to the third generation cephalosporins among Klebsiella pneumoniae in Chennai. Indian J Med Microbiol 2002; 20:92-95.

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14. Singhal S, Mathur T, Khan S, Upadhyay DJ, Chugh S, Gaind R,Rattan A. Evaluation of the methods for AmpC β-lactamase in gram negative clinical isolates from tertiary care hospitals. Indian J Med Microbiol 2005; 23(2):120-24.

15. Kulkarni R ,Dohe V, Ghadge D, Bhore A. A study of extended spectrum β- lactamases (ESBL) producers in clinical isolates. Medical journal of western India.2013; 41(1).

16. Anathakrishanan AN, Kanungo R. Detection of extended spectrum β-lactamase produces among surgical wound infections and burns patients in JIPER. J Lab Physicians 2009;1(1):7-10.

17. Dalela G. Prevalence of extended spectrum beta-lactamase (ESBL) producers among gram-negative bacilli from various clinical isolates in a tertiary care hospital at Jhalawar, Rajasthan, India. J ClinDiag Research. 2012;6(2):182-187.

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19. Menon T, Bindu D, Kumar C, Nalini S, Thirunarayan Ma. Comparison of Double Disc and Three Dimensional Methods to Screen for Esbl Producers in a Tertiary Care Hospital. Indian J Med Microbiol 2006; 24:117-20

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A Study by Avijit Singh"Comparison of Post Operative Clinical Outcomes Between “Made in India” TTK Chitra Mechanical Heart Valve Versus St Jude Mechanical Heart Valve in Valve Replacement Surgery" is awarded Best Article for Vol 12 issue 19
A Study by Sonali Banerjee and Mary Mathews N. entitled "Exploring Quality of Life and Perceived Experiences Among Couples Undergoing Fertility Treatment in Western India: A Mixed Methodology" is awarded Best Article for Vol 12 issue 18
A Study by Jabbar Desai et al. entitled "Prevalence of Obstructive Airway Disease in Patients with Ischemic Heart Disease and Hypertension" is awarded Best Article for Vol 12 issue 17
A Study by Juna Byun et al. entitled "Study on Difference in Coronavirus-19 Related Anxiety between Face-to-face and Non-face-to-face Classes among University Students in South Korea" is awarded Best Article for Vol 12 issue 16
A Study by Sudha Ramachandra & Vinay Chavan entitled "Enhanced-Hybrid-Age Layered Population Structure (E-Hybrid-ALPS): A Genetic Algorithm with Adaptive Crossover for Molecular Docking Studies of Drug Discovery Process" is awarded Best article for Vol 12 issue 15
A Study by Varsha M. Shindhe et al. entitled "A Study on Effect of Smokeless Tobacco on Pulmonary Function Tests in Class IV Workers of USM-KLE (Universiti Sains Malaysia-Karnataka Lingayat Education Society) International Medical Programme, Belagavi" is awarded Best article of Vol 12 issue 14, July 2020
A study by Amruta Choudhary et al. entitled "Family Planning Knowledge, Attitude and Practice Among Women of Reproductive Age from Rural Area of Central India" is awarded Best Article for special issue "Modern Therapeutics Applications"
A study by Raunak Das entitled "Study of Cardiovascular Dysfunctions in Interstitial Lung Diseas epatients by Correlating the Levels of Serum NT PRO BNP and Microalbuminuria (Biomarkers of Cardiovascular Dysfunction) with Echocardiographic, Bronchoscopic and HighResolution Computed Tomography Findings of These ILD Patients" is awarded Best Article of Vol 12 issue 13 
A Study by Kannamani Ramasamy et al. entitled "COVID-19 Situation at Chennai City – Forecasting for the Better Pandemic Management" is awarded best article for  Vol 12 issue 12
A Study by Muhammet Lutfi SELCUK and Fatma entitled "Distinction of Gray and White Matter for Some Histological Staining Methods in New Zealand Rabbit's Brain" is awarded best article for  Vol 12 issue 11
A Study by Anamul Haq et al. entitled "Etiology of Abnormal Uterine Bleeding in Adolescents – Emphasis Upon Polycystic Ovarian Syndrome" is awarded best article for  Vol 12 issue 10
A Study by entitled "Estimation of Reference Interval of Serum Progesterone During Three Trimesters of Normal Pregnancy in a Tertiary Care Hospital of Kolkata" is awarded best article for  Vol 12 issue 09
A Study by Ilona Gracie De Souza & Pavan Kumar G. entitled "Effect of Releasing Myofascial Chain in Patients with Patellofemoral Pain Syndrome - A Randomized Clinical Trial" is awarded best article for  Vol 12 issue 08
A Study by Virendra Atam et. al. entitled "Clinical Profile and Short - Term Mortality Predictors in Acute Stroke with Emphasis on Stress Hyperglycemia and THRIVE Score : An Observational Study" is awarded best article for  Vol 12 issue 07
A Study by K. Krupashree et. al. entitled "Protective Effects of Picrorhizakurroa Against Fumonisin B1 Induced Hepatotoxicity in Mice" is awarded best article for issue Vol 10 issue 20
A study by Mithun K.P. et al "Larvicidal Activity of Crude Solanum Nigrum Leaf and Berries Extract Against Dengue Vector-Aedesaegypti" is awarded Best Article for Vol 10 issue 14 of IJCRR
A study by Asha Menon "Women in Child Care and Early Education: Truly Nontraditional Work" is awarded Best Article for Vol 10 issue 13
A study by Deep J. M. "Prevalence of Molar-Incisor Hypomineralization in 7-13 Years Old Children of Biratnagar, Nepal: A Cross Sectional Study" is awarded Best Article for Vol 10 issue 11 of IJCRR
A review by Chitra et al to analyse relation between Obesity and Type 2 diabetes is awarded 'Best Article' for Vol 10 issue 10 by IJCRR. 
A study by Karanpreet et al "Pregnancy Induced Hypertension: A Study on Its Multisystem Involvement" is given Best Paper Award for Vol 10 issue 09

List of Awardees

A Study by Ese Anibor et al. "Evaluation of Temporomandibular Joint Disorders Among Delta State University Students in Abraka, Nigeria" from Vol 13 issue 16 received Emerging Researcher Award


A Study by Alkhansa Mahmoud et al. entitled "mRNA Expression of Somatostatin Receptors (1-5) in MCF7 and MDA-MB231 Breast Cancer Cells" from Vol 13 issue 06 received Emerging Researcher Award


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International Journal of Current Research and Review (IJCRR) provides platform for researchers to publish and discuss their original research and review work. IJCRR can not be held responsible for views, opinions and written statements of researchers published in this journal

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