Dataset Information

Microfluidics-based point-of-care test for serodiagnosis of Lyme Disease.

ABSTRACT: Currently, diagnostic testing for Lyme disease is done by determination of the serologic responses to Borrelia burgdorferi antigens, with the exception of the early localized phase of disease where diagnosis must be done clinically. Here, we describe the use of microfluidics technology to develop a multiplexed rapid lab-on-a-chip point of care (POC) assay for the serologic diagnosis of human Lyme disease. Following ELISA screening of 12 candidate antigens, we tested 8 on a microfluidic diagnostic system, called mChip-Ld, using a set of 60 serological samples. The mChip-Ld test, which can be performed in 15?minutes at the point of care, showed promising performance for detection of antibodies to B. burgdorferi using the PPO triplex test (rP100?+?PepVF?+?rOspC-K, AUC of 0.844) compared to a gold-standard reference of culture confirmed clinical samples. The performance is comparable to the commonly used C6 peptide by lab-based ELISA. In addition, the mChip-Ld test showed promising performance for early-stage diagnosis of the disease using the antigen OspC-K (sensitivity and specificity of 84% and 92%, respectively; AUC of 0.877). Overall, this study underscores the potential of using microfluidics to aid the diagnosis of Lyme disease at the point of care.

SUBMITTER: Nayak S

PROVIDER: S-EPMC5057150 | biostudies-other | 2016 Oct

REPOSITORIES: biostudies-other

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Microfluidics-based point-of-care test for serodiagnosis of Lyme Disease.

Nayak Samiksha S Sridhara Archana A Melo Rita R Richer Luciana L Chee Natalie H NH Kim Jiyoon J Linder Vincent V Steinmiller David D Sia Samuel K SK Gomes-Solecki Maria M

Scientific reports 20161011

Currently, diagnostic testing for Lyme disease is done by determination of the serologic responses to Borrelia burgdorferi antigens, with the exception of the early localized phase of disease where diagnosis must be done clinically. Here, we describe the use of microfluidics technology to develop a multiplexed rapid lab-on-a-chip point of care (POC) assay for the serologic diagnosis of human Lyme disease. Following ELISA screening of 12 candidate antigens, we tested 8 on a microfluidic diagnosti ...[more]

PMID: 27725740

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Project description:BackgroundMozambique is a high-prevalence country for HIV and early detection of new HIV infections is crucial for control of the epidemic. We aimed to evaluate the accuracy of the 4th-generation rapid diagnostic test (RDT) AlereTM HIV Combo in detecting acute and seroconverted HIV-infection, among sexually-active women attending three clinical health centers in Maputo, Mozambique.MethodsWomen aged 14-55 years (n = 920) seeking care at the Mavalane Health Area, Maputo (February 2018-January 2019) were included, and blood specimens sampled. Sociodemographic and sexual behavior data were collected. Point-of-care HIV testing was performed using Alere DetermineTM HIV-1/2 and Uni-GoldTM HIV-1/2. All samples were also tested using Enzygnost® HIV Integral 4 and Innotest® HIV Antigen mAb in laboratory. The 4th-generation RDT AlereTM HIV Combo was evaluated on serum samples in the laboratory. Finally, Innotest® HIV Antigen mAb, Enzygnost® HIV Integral 4 (Ag/Ab), and HIV RNA quantification acted as gold standard assays in the evaluation of AlereTM HIV Combo test for HIV antigen detection (in clinical samples and in three HIV-1 seroconversion panels).ResultsThe antibody component of the 4th generation AlereTM HIV Combo RDT demonstrated a sensitivity and specificity of 100% examining clinical samples. However, the test did not detect HIV p24 antigen in any clinical samples, while Innotest® HIV Antigen mAb, verified by Enzygnost® HIV Integral 4 (Ag/Ab) and/or HIV RNA quantification, detected HIV antigen in six clinical samples. Furthermore, the AlereTM HIV Combo RDT had a low sensitivity in the detection of HIV p24 antigen in seroconversion panels. The HIV prevalence among the examined women was 17.8%.ConclusionsThe 4th-generation RDT AlereTM HIV Combo showed similar sensitivity to the 3rd-generation RDTs to detect seroconverted HIV-infections. However, the sensitivity for detection of HIV p24 antigen and diagnosing acute HIV infections, before seroconversion, was low. There is an urgent need to develop and evaluate simple and affordable POC tests with high sensitivity and specificity for diagnosing individuals with acute HIV infection in resource-limited settings with high HIV prevalence.

Project description:BackgroundEarly and accessible testing for influenza with point-of-care testing (POCT) can be a critical factor for deciding to begin antiviral treatment. More than 10,000 pharmacies across the USA offer Clinical Laboratory Improvement Amendments-waived POCT for infectious diseases, such as influenza A/B. Knowledge of barriers and facilitators to large-scale POCT implementation may be useful in scaling POCT for influenza test-and-treat services (Flu POCT). The objective of this study was to explore the experiences of pharmacists who were early adopters of Flu POCT and treatment under collaborative practice agreement in community pharmacy settings.MethodsQualitative research design with in-depth, semi-structured virtual video interviews of licensed US community pharmacists. Interview questions were derived from the Consolidated Framework for Implementation Research (CFIR). Interviewees were selected via a purposeful sampling of pharmacists who were enrolled in a nationwide clinical trial involving pharmacy-based influenza test-and-treat under a collaborative agreement. Interviews were recorded and transcribed. A deductive analytic approach was used via constructs from the CFIR.ResultsSix pharmacists were interviewed. Interviews ranged from 28 to 70 min, with an average length of 46 min. Four broad themes emerged from the data, and each had corresponding subthemes and supporting quotes: influence of the Flu POCT service characteristics on pharmacy implementation, influence of factors outside of the pharmacy setting in Flu POCT implementation, factors within the pharmacy setting influencing implementation, and process of implementing Flu POCT. A novel pharmacy-based Flu POCT implementation framework is presented.ConclusionsImplementation of community pharmacy-based Flu POCT services is feasible; but, a thorough understanding of both barriers and facilitators to their implementation is needed to increase the spread and scale of these programs. Specifically, pharmacy stakeholders should focus efforts on increasing patient and provider awareness, pharmacist acceptance, leadership support, and support of health providers external to the pharmacy to improve implementation success.

Dataset Information

Microfluidics-based point-of-care test for serodiagnosis of Lyme Disease.

Publications

Microfluidics-based point-of-care test for serodiagnosis of Lyme Disease.

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