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  1. Article ; Online: Engineering Steps for Mobile Point-of-Care Diagnostic Devices.

    Malekjahani, Ayden / Sindhwani, Shrey / Syed, Abdullah Muhammad / Chan, Warren C W

    Accounts of chemical research

    2019  Volume 52, Issue 9, Page(s) 2406–2414

    Abstract: Mobile phone technology is a perfect companion for point-of-care diagnostics as they come equipped with advanced processors, high resolution cameras, and network connectivity. Despite several academic pursuits, only a few mobile phone diagnostics have ... ...

    Abstract Mobile phone technology is a perfect companion for point-of-care diagnostics as they come equipped with advanced processors, high resolution cameras, and network connectivity. Despite several academic pursuits, only a few mobile phone diagnostics have been tested in the field, commercialized or achieved regulatory approval. This review will address the challenges associated with developing mobile diagnostics and suggest strategies to overcome them. We aim to provide a resource for researchers to accelerate the development of new diagnostics. Our Account includes an overview of published mobile phone diagnostics and highlights lessons learned from their approach to diagnostic development. Also, we have included recommendations from regulatory and public health agencies, such as the U.S. Food and Drug Administration and World Health Organization, to further guide researchers. We believe that the development of mobile phone point-of-care diagnostics takes place in four distinct steps: (1) Needs and Value Assessment, (2) Technology Development, (3) Preclinical Verification, and (4) Clinical Validation and Field Trials. During each step, we outline developmental strategies to help researchers avoid potential challenges. (1) Researchers commonly develop devices to maximize technical parameters such as sensitivity and time which do not necessarily translate to increased clinical impact. Researchers must focus on assessing specific diagnostic needs and the value which a potential device would offer. (2) Often, researchers claim they have developed devices for feasible implementation at the point-of-care, yet they rely on laboratory resources. Researchers must develop equipment-free devices which are agnostic to any mobile phone. (3) Another challenge researchers face is decreased performance during field evaluations relative to initial laboratory verification. Researchers must ensure that they simulate the field conditions during laboratory verification to achieve successful translation. (4) Finally, proper field testing of devices must be performed in conditions which match that of the final intended use. The future of mobile phone point-of-care diagnostic devices is bright and has the potential to radically change how patients are diagnosed. Before we reach this point, researchers must take a step backward and focus on the first-principles of basic research. The widespread adoption and rapid scaling of these devices can only be achieved once the fundamentals have been considered. The insights and strategies provided here will help researchers avoid pitfalls, streamline development and make better decisions during the development of new diagnostics. Further, we believe this Account can help push the field of mobile diagnostics toward increased productivity, leading to more approved devices and ultimately helping curb the burden of disease worldwide.
    MeSH term(s) Cell Phone ; Humans ; Point-of-Care Systems
    Language English
    Publishing date 2019-08-20
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1483291-4
    ISSN 1520-4898 ; 0001-4842
    ISSN (online) 1520-4898
    ISSN 0001-4842
    DOI 10.1021/acs.accounts.9b00200
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Genotyping SARS-CoV‑2 Variants Using Ratiometric Nucleic Acid Barcode Panels

    Kozlowski, Hannah N. / Malekjahani, Ayden / Li, Vanessa Y. C. / Lekuti, Ayokunle A. / Perusini, Stephen / Bell, Natalie G. / Voisin, Veronique / Pouyabahar, Delaram / Pai, Shraddha / Bader, Gary D. / Mubareka, Samira / Gubbay, Jonathan B. / Chan, Warren C. W.

    Analytical Chemistry. 2023 Mar. 31, v. 95, no. 14 p.5877-5885

    2023  

    Abstract: Designing diagnostic assays to genotype rapidly mutating viruses remains a challenge despite the overall improvements in nucleic acid detection technologies. RT-PCR and next-generation sequencing are unsuitable for genotyping during outbreaks or in point- ...

    Abstract Designing diagnostic assays to genotype rapidly mutating viruses remains a challenge despite the overall improvements in nucleic acid detection technologies. RT-PCR and next-generation sequencing are unsuitable for genotyping during outbreaks or in point-of-care detection due to their infrastructure requirements and longer turnaround times. We developed a quantum dot barcode multiplexing system to genotype mutated viruses. We designed multiple quantum dot barcodes to target conserved, wildtype, and mutated regions of SARS-CoV-2. We calculated ratios of the signal output from different barcodes that enabled SARS-CoV-2 detection and identified SARS-CoV-2 variant strains from a sample. We detected different sequence types, including conserved genes, nucleotide deletions, and single nucleotide substitutions. Our system detected SARS-CoV-2 patient specimens with 98% sensitivity and 94% specificity across 91 patient samples. Further, we leveraged our barcoding and ratio system to track the emergence of the N501Y SARS-CoV-2 mutation from December 2020 to May 2021 and demonstrated that the more transmissible N501Y mutation started to dominate infections by April 2021. Our barcoding and signal ratio approach can genotype viruses and track the emergence of viral mutations in a single diagnostic test. This technology can be extended to tracking other viruses. Combined with smartphone detection technologies, this assay can be adapted for point-of-care tracking of viral mutations in real time.
    Keywords Severe acute respiratory syndrome coronavirus 2 ; analytical chemistry ; barcoding ; genotype ; genotyping ; infrastructure ; mobile telephones ; mutation ; nucleic acids ; patients ; point-of-care systems ; quantum dots
    Language English
    Dates of publication 2023-0331
    Size p. 5877-5885.
    Publishing place American Chemical Society
    Document type Article ; Online
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.2c04630
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: Genotyping SARS-CoV-2 Variants Using Ratiometric Nucleic Acid Barcode Panels.

    Kozlowski, Hannah N / Malekjahani, Ayden / Li, Vanessa Y C / Lekuti, Ayokunle A / Perusini, Stephen / Bell, Natalie G / Voisin, Veronique / Pouyabahar, Delaram / Pai, Shraddha / Bader, Gary D / Mubareka, Samira / Gubbay, Jonathan B / Chan, Warren C W

    Analytical chemistry

    2023  Volume 95, Issue 14, Page(s) 5877–5885

    Abstract: Designing diagnostic assays to genotype rapidly mutating viruses remains a challenge despite the overall improvements in nucleic acid detection technologies. RT-PCR and next-generation sequencing are unsuitable for genotyping during outbreaks or in point- ...

    Abstract Designing diagnostic assays to genotype rapidly mutating viruses remains a challenge despite the overall improvements in nucleic acid detection technologies. RT-PCR and next-generation sequencing are unsuitable for genotyping during outbreaks or in point-of-care detection due to their infrastructure requirements and longer turnaround times. We developed a quantum dot barcode multiplexing system to genotype mutated viruses. We designed multiple quantum dot barcodes to target conserved, wildtype, and mutated regions of SARS-CoV-2. We calculated ratios of the signal output from different barcodes that enabled SARS-CoV-2 detection and identified SARS-CoV-2 variant strains from a sample. We detected different sequence types, including conserved genes, nucleotide deletions, and single nucleotide substitutions. Our system detected SARS-CoV-2 patient specimens with 98% sensitivity and 94% specificity across 91 patient samples. Further, we leveraged our barcoding and ratio system to track the emergence of the N501Y SARS-CoV-2 mutation from December 2020 to May 2021 and demonstrated that the more transmissible N501Y mutation started to dominate infections by April 2021. Our barcoding and signal ratio approach can genotype viruses and track the emergence of viral mutations in a single diagnostic test. This technology can be extended to tracking other viruses. Combined with smartphone detection technologies, this assay can be adapted for point-of-care tracking of viral mutations in real time.
    MeSH term(s) Humans ; Nucleic Acids ; SARS-CoV-2/genetics ; COVID-19/diagnosis ; Genotype ; Nucleotides ; Mutation
    Chemical Substances Nucleic Acids ; Nucleotides
    Language English
    Publishing date 2023-03-31
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.2c04630
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Diagnosing COVID-19: The Disease and Tools for Detection.

    Udugama, Buddhisha / Kadhiresan, Pranav / Kozlowski, Hannah N / Malekjahani, Ayden / Osborne, Matthew / Li, Vanessa Y C / Chen, Hongmin / Mubareka, Samira / Gubbay, Jonathan B / Chan, Warren C W

    ACS nano

    2020  Volume 14, Issue 4, Page(s) 3822–3835

    Abstract: COVID-19 has spread globally since its discovery in Hubei province, China in December 2019. A combination of computed tomography imaging, whole genome sequencing, and electron microscopy were initially used to screen and identify SARS-CoV-2, the viral ... ...

    Abstract COVID-19 has spread globally since its discovery in Hubei province, China in December 2019. A combination of computed tomography imaging, whole genome sequencing, and electron microscopy were initially used to screen and identify SARS-CoV-2, the viral etiology of COVID-19. The aim of this review article is to inform the audience of diagnostic and surveillance technologies for SARS-CoV-2 and their performance characteristics. We describe point-of-care diagnostics that are on the horizon and encourage academics to advance their technologies beyond conception. Developing plug-and-play diagnostics to manage the SARS-CoV-2 outbreak would be useful in preventing future epidemics.
    MeSH term(s) Betacoronavirus/pathogenicity ; COVID-19 ; COVID-19 Testing ; Clinical Laboratory Techniques ; Coronavirus Infections/diagnosis ; Humans ; Mobile Applications ; Nucleic Acid Amplification Techniques ; Pandemics ; Pneumonia, Viral/diagnosis ; Point-of-Care Testing ; Population Surveillance ; Real-Time Polymerase Chain Reaction ; SARS-CoV-2 ; Smartphone ; Tomography, X-Ray Computed ; Viral Proteins/analysis
    Chemical Substances Viral Proteins
    Keywords covid19
    Language English
    Publishing date 2020-03-30
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.0c02624
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Surveilling and Tracking COVID-19 Patients Using a Portable Quantum Dot Smartphone Device.

    Zhang, Yuwei / Malekjahani, Ayden / Udugama, Buddhisha N / Kadhiresan, Pranav / Chen, Hongmin / Osborne, Matthew / Franz, Max / Kucera, Mike / Plenderleith, Simon / Yip, Lily / Bader, Gary D / Tran, Vanessa / Gubbay, Jonathan B / McGeer, Allison / Mubareka, Samira / Chan, Warren C W

    Nano letters

    2021  Volume 21, Issue 12, Page(s) 5209–5216

    Abstract: The ability to rapidly diagnose, track, and disseminate information for SARS-CoV-2 is critical to minimize its spread. Here, we engineered a portable smartphone-based quantum barcode serological assay device for real-time surveillance of patients ... ...

    Abstract The ability to rapidly diagnose, track, and disseminate information for SARS-CoV-2 is critical to minimize its spread. Here, we engineered a portable smartphone-based quantum barcode serological assay device for real-time surveillance of patients infected with SARS-CoV-2. Our device achieved a clinical sensitivity of 90% and specificity of 100% for SARS-CoV-2, as compared to 34% and 100%, respectively, for lateral flow assays in a head-to-head comparison. The lateral flow assay misdiagnosed ∼2 out of 3 SARS-CoV-2 positive patients. Our quantum dot barcode device has ∼3 times greater clinical sensitivity because it is ∼140 times more analytically sensitive than lateral flow assays. Our device can diagnose SARS-CoV-2 at different sampling dates and infectious severity. We developed a databasing app to provide instantaneous results to inform patients, physicians, and public health agencies. This assay and device enable real-time surveillance of SARS-CoV-2 seroprevalence and potential immunity.
    MeSH term(s) COVID-19 ; Humans ; Immunoassay ; Quantum Dots ; SARS-CoV-2 ; Sensitivity and Specificity ; Seroepidemiologic Studies ; Smartphone
    Language English
    Publishing date 2021-06-10
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.1c01280
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Diagnosing COVID-19

    Udugama, Buddhisha / Kadhiresan, Pranav / Kozlowski, Hannah N. / Malekjahani, Ayden / Osborne, Matthew / Li, Vanessa Y. C. / Chen, Hongmin / Mubareka, Samira / Gubbay, Jonathan B. / Chan, Warren C. W.

    ACS Nano

    The Disease and Tools for Detection

    2020  Volume 14, Issue 4, Page(s) 3822–3835

    Keywords General Engineering ; General Physics and Astronomy ; General Materials Science ; covid19
    Language English
    Publisher American Chemical Society (ACS)
    Publishing country us
    Document type Article ; Online
    ISSN 1936-0851
    DOI 10.1021/acsnano.0c02624
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article: Diagnosing COVID-19: The Disease and Tools for Detection

    Udugama, Buddhisha / Kadhiresan, Pranav / Kozlowski, Hannah N / Malekjahani, Ayden / Osborne, Matthew / Li, Vanessa Y C / Chen, Hongmin / Mubareka, Samira / Gubbay, Jonathan B / Chan, Warren C W

    ACS Nano

    Abstract: COVID-19 has spread globally since its discovery in Hubei province, China in December 2019. A combination of computed tomography imaging, whole genome sequencing, and electron microscopy were initially used to screen and identify SARS-CoV-2, the viral ... ...

    Abstract COVID-19 has spread globally since its discovery in Hubei province, China in December 2019. A combination of computed tomography imaging, whole genome sequencing, and electron microscopy were initially used to screen and identify SARS-CoV-2, the viral etiology of COVID-19. The aim of this review article is to inform the audience of diagnostic and surveillance technologies for SARS-CoV-2 and their performance characteristics. We describe point-of-care diagnostics that are on the horizon and encourage academics to advance their technologies beyond conception. Developing plug-and-play diagnostics to manage the SARS-CoV-2 outbreak would be useful in preventing future epidemics.
    Keywords covid19
    Publisher WHO
    Document type Article
    Note WHO #Covidence: #832348
    Database COVID19

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