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Koskinen JM, Soukka JM, Meltola NJ, Koskinen JO. Microbial identification from faces and urine in one step by two-photon excitation assay technique. J Immunol Methods 2018; 460:113-118. [PMID: 30056941 DOI: 10.1016/j.jim.2018.06.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [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: 02/08/2018] [Revised: 06/15/2018] [Accepted: 06/28/2018] [Indexed: 01/03/2023]
Abstract
Two-photon excitation fluorometry (TPX) is a separation-free bioaffinity assay technique which enables accurate diagnostic testing in microvolumes. The technology is currently commercially applied in an automated mariPOC® test system for rapid phenotypic multi-microbe detection of pathogen antigens. The first TPX applications for diagnostics were intended for respiratory infection testing from nasopharyngeal and oropharyngeal samples. Feces and urine are more complex sample matrices and contain substances that may interfere with immunoassay binding or fluorescence detection. Our objective was to study the suitability of these complex matrices in the TPX technique. As expected, feces and urine elevated fluorescence levels but the methodology has the unique property of compensating for matrix effects. Compensation allows reliable separation of specific fluorescence from the fluorescence caused by the matrix. The studied clinical samples did not contain immunoassay inhibitors. The results suggest that the methodology is robust and may provide reliable testing of feces and urine samples with high accuracy.
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Affiliation(s)
- Juha M Koskinen
- ArcDia International Ltd, Lemminkäisenkatu 32, 20520 Turku, Finland; Faculty of Medicine, University of Turku, Kiinamyllynkatu 10, 20520 Turku, Finland.
| | - Jori M Soukka
- ArcDia International Ltd, Lemminkäisenkatu 32, 20520 Turku, Finland
| | - Niko J Meltola
- ArcDia International Ltd, Lemminkäisenkatu 32, 20520 Turku, Finland
| | - Janne O Koskinen
- ArcDia International Ltd, Lemminkäisenkatu 32, 20520 Turku, Finland
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Schoepp NG, Schlappi TS, Curtis MS, Butkovich SS, Miller S, Humphries RM, Ismagilov RF. Rapid pathogen-specific phenotypic antibiotic susceptibility testing using digital LAMP quantification in clinical samples. Sci Transl Med 2018; 9:9/410/eaal3693. [PMID: 28978750 DOI: 10.1126/scitranslmed.aal3693] [Citation(s) in RCA: 149] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 06/30/2017] [Accepted: 09/05/2017] [Indexed: 12/30/2022]
Abstract
Rapid antimicrobial susceptibility testing (AST) is urgently needed for informing treatment decisions and preventing the spread of antimicrobial resistance resulting from the misuse and overuse of antibiotics. To date, no phenotypic AST exists that can be performed within a single patient visit (30 min) directly from clinical samples. We show that AST results can be obtained by using digital nucleic acid quantification to measure the phenotypic response of Escherichia coli present within clinical urine samples exposed to an antibiotic for 15 min. We performed this rapid AST using our ultrafast (~7 min) digital real-time loop-mediated isothermal amplification (dLAMP) assay [area under the curve (AUC), 0.96] and compared the results to a commercial (~2 hours) digital polymerase chain reaction assay (AUC, 0.98). The rapid dLAMP assay can be used with SlipChip microfluidic devices to determine the phenotypic antibiotic susceptibility of E. coli directly from clinical urine samples in less than 30 min. With further development for additional pathogens, antibiotics, and sample types, rapid digital AST (dAST) could enable rapid clinical decision-making, improve management of infectious diseases, and facilitate antimicrobial stewardship.
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Affiliation(s)
- Nathan G Schoepp
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA
| | - Travis S Schlappi
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA
| | - Matthew S Curtis
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA
| | - Slava S Butkovich
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA
| | - Shelley Miller
- Department of Pathology and Laboratory Medicine, University of California, Los Angeles, 10888 Le Conte Avenue, Brentwood Annex, Los Angeles, CA 90095, USA
| | - Romney M Humphries
- Department of Pathology and Laboratory Medicine, University of California, Los Angeles, 10888 Le Conte Avenue, Brentwood Annex, Los Angeles, CA 90095, USA
| | - Rustem F Ismagilov
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA.
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Högmander M, Paul CJ, Chan S, Hokkanen E, Eskonen V, Pahikkala T, Pihlasalo S. Luminometric Label Array for Counting and Differentiation of Bacteria. Anal Chem 2017; 89:3208-3216. [DOI: 10.1021/acs.analchem.6b05142] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Milla Högmander
- Department
of Cell Biology and Anatomy, Institute of Biomedicine, University of Turku, Kiinamyllynkatu 10, FI-20520 Turku, Finland
| | - Catherine J. Paul
- Applied
Microbiology, Department of Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden
- Water
Resources Engineering, Department of Building and Environmental Engineering, Lund University, P.O. Box 118, SE-22100 Lund, Sweden
| | - Sandy Chan
- Applied
Microbiology, Department of Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden
- Sweden
Water Research, Ideon Science Park, Scheelevägen 15, SE-22370 Lund, Sweden
| | - Elina Hokkanen
- Department
of Cell Biology and Anatomy, Institute of Biomedicine, University of Turku, Kiinamyllynkatu 10, FI-20520 Turku, Finland
| | - Ville Eskonen
- Laboratory
of Materials Chemistry and Chemical Analysis, Department of Chemistry, University of Turku, Vatselankatu 2, FI-20500 Turku, Finland
| | - Tapio Pahikkala
- Department
of Information Technology, University of Turku, Vesilinnantie
5, FI-20500 Turku, Finland
| | - Sari Pihlasalo
- Department
of Cell Biology and Anatomy, Institute of Biomedicine, University of Turku, Kiinamyllynkatu 10, FI-20520 Turku, Finland
- Applied
Microbiology, Department of Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden
- Laboratory
of Materials Chemistry and Chemical Analysis, Department of Chemistry, University of Turku, Vatselankatu 2, FI-20500 Turku, Finland
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Hirvonen JJ. The use of molecular methods for the detection and identification of methicillin-resistant Staphylococcus aureus. Biomark Med 2015; 8:1115-25. [PMID: 25402581 DOI: 10.2217/bmm.14.60] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is a major pathogen in many hospitals and long-term care facilities as well as in the community. To limit the spread of MRSA, early detection and proper treatment are essential. Because conventional culture as gold standard is time consuming, new techniques such as PCR-based and hybridization assays have emerged for the rapid detection of MRSA. This review will focus on the currently available molecular-based assays and on their utility and performance for detection of S. aureus, of its virulence factors and of the markers for acquired resistance.
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