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Tellapragada C, Hasan B, Antonelli A, Maruri A, de Vogel C, Gijón D, Coppi M, Verbon A, van Wamel W, Rossolini GM, Cantón R, Giske CG. Isothermal microcalorimetry minimal inhibitory concentration testing in extensively drug resistant Gram-negative bacilli: a multicentre study. Clin Microbiol Infect 2020; 26:1413.e1-1413.e7. [PMID: 32006694 DOI: 10.1016/j.cmi.2020.01.026] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 12/27/2019] [Accepted: 01/21/2020] [Indexed: 02/07/2023]
Abstract
OBJECTIVES To evaluate the performance of an isothermal microcalorimetry (IMC) method for determining the MICs among extensively drug-resistant Gram-negative bacilli. METHODS A collection of 320 clinical isolates (n = 80 of each) of Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa and Acinetobacter baumannii from Sweden, Spain, Italy and the Netherlands were tested. The MICs were determined using the IMC device calScreener (Symcel, Stockholm, Sweden) and ISO-broth microdilution as the reference method. Essential agreement, categorical agreement, very major errors (VME), major errors (ME) and minor (mE) errors for each antibiotic were determined. RESULTS Data from 316 isolates were evaluated. Four errors (two ME, one VME, one mE) among 80 K. pneumoniae, six errors (four ME, one VME, one mE) among 79 E. coli, 15 errors (seven VME, three ME, five mE) among 77 P. aeruginosa and 18 errors (12 VME, two ME, four mE) among 80 A. baumannii were observed. Average essential agreement and categorical agreement of the IMC method were 96.6% (95% confidence interval, 94.2-99) and 97.1% (95% confidence interval, 95.4-98.5) respectively when the MICs were determined at the end of 18 hours. Categorical agreement of the IMC method for prediction of MIC by the end of 8 hours for colistin, meropenem, amikacin, ciprofloxacin and piperacillin/tazobactam were 95%, 91.4%, 94%, 95.2% and 93.7% respectively. CONCLUSIONS The IMC method could accurately determine the MICs among extensively drug-resistant clinical isolates of E. coli, K. pneumoniae, P. aeruginosa and A. baumannii isolates.
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Affiliation(s)
- C Tellapragada
- Department of Laboratory Medicine, Division of Clinical Microbiology, Karolinska Institute, Stockholm, Sweden
| | - B Hasan
- Department of Laboratory Medicine, Division of Clinical Microbiology, Karolinska Institute, Stockholm, Sweden
| | - A Antonelli
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy; Clinical Microbiology and Virology Unit, Florence Careggi University Hospital, Florence, Italy
| | - A Maruri
- Servicio de Microbiología. Hospital Universitario Ramón y Cajal e Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain
| | - C de Vogel
- Department of Medical Microbiology and Infectious Diseases, Erasmus MC, Rotterdam, the Netherlands
| | - D Gijón
- Servicio de Microbiología. Hospital Universitario Ramón y Cajal e Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain
| | - M Coppi
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy; Clinical Microbiology and Virology Unit, Florence Careggi University Hospital, Florence, Italy
| | - A Verbon
- Department of Medical Microbiology and Infectious Diseases, Erasmus MC, Rotterdam, the Netherlands
| | - W van Wamel
- Department of Medical Microbiology and Infectious Diseases, Erasmus MC, Rotterdam, the Netherlands
| | - G M Rossolini
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy; Clinical Microbiology and Virology Unit, Florence Careggi University Hospital, Florence, Italy
| | - R Cantón
- Servicio de Microbiología. Hospital Universitario Ramón y Cajal e Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain
| | - C G Giske
- Department of Laboratory Medicine, Division of Clinical Microbiology, Karolinska Institute, Stockholm, Sweden; Division of Clinical Microbiology, Karolinska University Hospital, Stockholm, Sweden.
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Patra S, Tellapragada C, Vandana KE, Mukhopadhyay C. Diagnostic utility of in-house loop-mediated isothermal amplification and real-time PCR targeting virB gene for direct detection of Brucella melitensis from clinical specimens. J Appl Microbiol 2019; 127:230-236. [PMID: 30897267 DOI: 10.1111/jam.14260] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 03/12/2019] [Accepted: 03/17/2019] [Indexed: 11/28/2022]
Abstract
AIMS In this present study, the utility of a newly developed loop-mediated isothermal amplification (LAMP) and real-time PCR assays designed to amplify the virB gene region of Brucella melitensis was evaluated from human clinical specimens. METHODS AND RESULTS Fifty-four culture-confirmed cases of brucellosis and 54 culture negative but clinically suspected cases of brucellosis were included in the study. Whole blood, serum and other nonblood specimens were collected and subjected to blood culture using automatic blood culture system, serological tests, LAMP assay and real-time PCR. Overall sensitivities of LAMP and real-time PCR assays were 67·5 and 68·3% respectively. For nonblood clinical specimens, we noticed a marked increase in the sensitivities of LAMP (88·9%) and real-time PCR (100%) assays. CONCLUSIONS Performance of LAMP and real-time PCR was not satisfactory for whole-blood specimens because of the low abundance of bacteria or DNA. On the other hand, using nonblood specimens, both the assays showed higher sensitivity and specificity which makes them a good alternative for the rapid diagnosis of human brucellosis. SIGNIFICANCE AND IMPACT OF THE STUDY The developed LAMP and real-time PCR assays are a specific and rapid diagnostic tool for direct and early detection of Brucella in clinical specimens.
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Affiliation(s)
- S Patra
- Department of Microbiology, Kasturba Medical College, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - C Tellapragada
- Department of Microbiology, Kasturba Medical College, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - K E Vandana
- Department of Microbiology, Kasturba Medical College, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - C Mukhopadhyay
- Department of Microbiology, Kasturba Medical College, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
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Tilak K, Eshwara VK, Tellapragada C, Mukhopadhyay C. Stamp's modified Ziehl-Neelsen staining for Brucella: Beware of the first impressions. Indian J Med Microbiol 2017; 34:561-562. [PMID: 27934847 DOI: 10.4103/0255-0857.195363] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- K Tilak
- Department of Microbiology, Kasturba Medical College, Manipal University, Manipal, Karnataka, India
| | - V K Eshwara
- Department of Microbiology, Kasturba Medical College, Manipal University, Manipal, Karnataka, India
| | - C Tellapragada
- Directorate of Research, Manipal University, Manipal, Karnataka, India
| | - C Mukhopadhyay
- Department of Microbiology, Kasturba Medical College, Manipal University, Manipal, Karnataka, India
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Chatterjee S, Eshwara VK, Tellapragada C, Mukhopadhyay C. Azithromycin susceptibility among clinical isolates of Salmonella: Interfacing guidelines with routine practices. Indian J Med Microbiol 2016; 34:397-8. [PMID: 27514976 DOI: 10.4103/0255-0857.188376] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- S Chatterjee
- Department of Microbiology, Kasturba Medical College, Manipal University, Manipal, Karnataka, India
| | - V K Eshwara
- Department of Microbiology, Kasturba Medical College, Manipal University, Manipal, Karnataka, India
| | - C Tellapragada
- Directorate of Research - Health Sciences, Manipal University, Manipal, Karnataka, India
| | - C Mukhopadhyay
- Department of Microbiology, Kasturba Medical College, Manipal University, Manipal, Karnataka, India
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Tellapragada C, Shaw T, Kalwaje Eshwara V, Bhat V, Kumar S, Mukhopadhyay C. Novel allelic profile of the clinical strains of burkholderia pseudomallei on multi locus sequence typing from India. Int J Infect Dis 2016. [DOI: 10.1016/j.ijid.2016.02.441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Tellapragada C, Kalwaje Eshwara V, Bhat P, Kamath A, Mukhopadhyay C. Vaginal colonization by microbes during early pregnancy and their association with adverse pregnancy outcomes. Int J Infect Dis 2016. [DOI: 10.1016/j.ijid.2016.02.738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Kalwaje Eshwara V, Sahai P, Tellapragada C, Mukhopadhyay C. Characterization of carbapenem resistance in clinical isolates of Enterobactieraceae. Int J Infect Dis 2016. [DOI: 10.1016/j.ijid.2016.02.255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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