Background: The International Normalized Ratio (INR) monitors anticoagulant treatment but relies on laboratory-based services. This could limit access to rapid monitoring and increase the diagnostic delay, both of which may be addressed by point-of-care testing (POCT). This study investigated the LumiraDx POC platform for INR monitoring.
View Article and Find Full Text PDFIntroduction: To ensure there is adequate investment into diagnostics, an understanding of the magnitude of impact and return on investment is necessary. We, therefore, sought to understand the health and economic impacts of the molecular diagnostic programme in South Africa, to deepen the understanding of the broad value of diagnostics and guide future healthcare investments.
Methods: We calculated the 10-year (where data were available) total cost and disability-adjusted life-years (DALYs) averted associated with molecular testing for tuberculosis diagnosis (2013-2022), HIV viral load monitoring (2013-2022), early infant diagnosis of HIV infection (2013-2022) and SARS-CoV-2 testing (2020-2022), based on the actual number of molecular tests conducted in South Africa for the respective time periods.
We present a case report of a 38-year-old woman who presented to the hospital with acute onset high amplitude, non-rhythmic, hyperkinetic movements of the right upper extremity, abnormal sensation of the right upper extremity from the elbow to the hand, and the inability to recognize her hand without visual input. This case discusses the differential diagnoses of acute hyperkinetic movement disorders and concurrent alien-limb in a patient presenting within the time window for vascular intervention. Readers are led through the reasoning behind acute interventional decision-making in a patient with a rare presentation.
View Article and Find Full Text PDFBackground: complex (MTBC) isolates are typically stored at -70 °C in cryovials containing 1 mL aliquots of a liquid medium, with or without 50% glycerol. Multiple uses of the culture stock may decrease the strain viability while increasing the risk of culture contamination. Small culture aliquots may be more practical; however, storage capacity remains challenging.
View Article and Find Full Text PDFA woman in her 70s was admitted for acute, painless vision loss in the left eye. Examination showed cherry red spot in the macula and plaque in the nasal vessels, consistent with central retinal artery occlusion. MRI orbits revealed multifocal subclinical acute infarcts in the right middle cerebral artery (MCA) territory and bilateral cerebella.
View Article and Find Full Text PDFThis study seeks to describe the rollout and current state of South Africa's GeneXpert molecular diagnostic program for tuberculosis (TB). Xpert MTB/RIF was introduced in 2011 with a subsequent expansion to include extra-pulmonary and paediatric testing, followed by Xpert MTB/RIF Ultra in 2017. Through a centralised laboratory information system and the use of a standardised platform for more than a decade, over 23 million tests were analysed, describing the numbers tested, complex detection, rifampin resistance, and the unsuccessful test rates.
View Article and Find Full Text PDFDiagnostics (Basel)
October 2023
An investigation was carried out to examine the use of national Xpert MTB/RIF data (2013-2017) and GIS technology for MTB/RIF surveillance in South Africa. The aim was to exhibit the potential of using molecular diagnostics for TB surveillance across the country. The variables analysed include () positivity, the mycobacterial proportion of rifampicin-resistant (RIF), and probe frequency.
View Article and Find Full Text PDFThe high demand for SARS-CoV-2 tests but limited supply to South African laboratories early in the COVID-19 pandemic resulted in a heterogenous diagnostic footprint of open and closed molecular testing platforms being implemented. Ongoing monitoring of the performance of these multiple and varied systems required novel approaches, especially during the circulation of variants. The National Health Laboratory Service centrally collected cycle threshold (Ct) values from 1,497,669 test results reported from 6 commonly used PCR assays in 36 months, and visually monitored changes in their median Ct within a 28-day centered moving average for each assays' gene targets.
View Article and Find Full Text PDFCultur Divers Ethnic Minor Psychol
October 2023
Objectives: This study investigated the moderating roles of contextual racial composition (neighborhood, school, and job) and parent-adolescent gender dyads on the relation between familial racial discrimination experiences and parental racial socialization messages.
Method: The analytic sample included 565 Black parents ( = 44.7; 56% mothers, 44% fathers) who reported on their personal and adolescents' racial discrimination experiences and their communication of cultural socialization and preparation for bias messages.
Blood-based diagnostics are critical for many medical decisions, but mostly rely on venepuncture, which can be inconvenient and painful. The Onflow Serum Gel (Loop Medical SA, Vaud, Lausanne, Switzerland) is a novel blood collection device that utilises needle-free technology to collect capillary blood. In this pilot study, 100 healthy participants were enrolled and provided two Onflow collected specimens and one venous blood specimen.
View Article and Find Full Text PDFSevere acute respiratory syndrome coronavirus 2 (SARS-CoV-2), emerged in late 2019, and its rapid spread around the globe led the World Health Organization to declare it a pandemic. Laboratory diagnostics provide important information to help control virus transmission, and molecular nucleic acid amplification tests have been recognized as the gold standard for the direct detection of viral genetic material. The main aim of this study was to independently evaluate the analytical performance of four molecular assays that were designed for the detection of SARS-CoV-2 on open testing platforms under emergency use approval, namely, the COVIWOK COVID-19 RT-PCR Meril COVID-19 One-step RT-PCR Kit, the AmoyDx Novel Coronavirus (2019-nCoV) Detection Kit, the Meril COVID-19 One-step RT-PCR Kit and the NeoPlex COVID-19 Detection Kit, as alternatives to the current standard of care (SOC) assays in-country.
View Article and Find Full Text PDFWe present the design and implementation of libkrylov, an open-source library for solving matrix-free eigenvalue, linear, and shifted linear equations using Krylov subspace methods. The primary objectives of libkrylov are flexible API design and modular structure, which enables integration with specialized matrix-vector evaluation "engines." Libkrylov features pluggable preconditioning, orthonormalization, and tunable convergence control.
View Article and Find Full Text PDFThe Xpert Xpress SARS-CoV-2 and Xpert Xpress SARS-CoV-2/Flu/RSV tests were rapidly developed and widely used during the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic. In response to emerging genetic variability, a new SARS-CoV-2 target (RNA-dependent RNA-polymerase) has been added to both tests: Xpert Xpress CoV-2 and Xpert Xpress CoV-2/Flu/RSV test. A rapid evaluation of both tests was performed in South Africa, using residual respiratory specimens.
View Article and Find Full Text PDFBackground: Aging is characterized by body composition alterations, including increased visceral adiposity accumulation and bone loss. Alcohol consumption may partially drive these alterations, but findings are mixed. This study primarily aimed to investigate whether different alcohol types (beer/cider, red wine, white wine/Champagne, spirits) differentially associated with body composition.
View Article and Find Full Text PDFObjective: To evaluate the effectiveness of an automated hand hygiene compliance system (AHHCS) audible alert and vibration for increasing hand hygiene compliance.
Design: A nonrandomized, before-and-after, quasi-experimental study of an AHHCS was implemented in several inpatient units. Over a 51-day period, the system's real-time audible alert was turned on, off, and back on.
Many risk factors have emerged for novel 2019 coronavirus disease (COVID-19). It is relatively unknown how these factors collectively predict COVID-19 infection risk, as well as risk for a severe infection (i.e.
View Article and Find Full Text PDFDigital tools can support community-based decentralized testing initiatives to broaden access to COVID-19 diagnosis, especially in high-transmission settings. This operational study investigated the use of antigen-detecting rapid diagnostic tests (Ag-RDTs) for COVID-19 combined with an end-to-end digital health solution, in three taxi ranks in Johannesburg, South Africa. Members of the public were eligible if they were aged ≥18 years, could read, and had a cellphone.
View Article and Find Full Text PDFThe Apolipoprotein E ε4 (APOE ε4) haplotype is the strongest genetic risk factor for late-onset Alzheimer's disease (AD). The Translocase of Outer Mitochondrial Membrane-40 (TOMM40) gene maintains cellular bioenergetics, which is disrupted in AD. TOMM40 rs2075650 ('650) G versus A carriage is consistently related to neural and cognitive outcomes, but it is unclear if and how it interacts with APOE.
View Article and Find Full Text PDFBackground: Depressive symptoms in Alzheimer's disease (AD) predict worse cognitive and functional outcomes. Both AD and major depression inflammatory processes are characterized by shunted tryptophan metabolism away from serotonin (5-HT) and toward the neuroinflammatory kynurenine (Kyn) pathway. The present study assessed associations between Kyn and behavioral, neuroanatomical, neuropathological, and physiological outcomes common to both AD and negative affect across the AD continuum.
View Article and Find Full Text PDFThe tiered laboratory framework for human immunodeficiency virus (HIV) viral load monitoring accommodates a range of HIV viral load testing platforms, with quality assessment critical to ensure quality patient testing. HIV plasma viral load testing is challenged by the instability of viral RNA. An approach using an RNA stabilizing buffer is described for the Xpert HIV-1 Viral Load (Cepheid) assay and was tested in remote laboratories in South Africa.
View Article and Find Full Text PDFBackground: Fluid intelligence (FI) involves abstract problem-solving without prior knowledge. Greater age-related FI decline increases Alzheimer's disease (AD) risk, and recent studies suggest that certain dietary regimens may influence rates of decline. However, it is uncertain how long-term food consumption affects FI among adults with or without familial history of AD (FH) or APOE4 (ɛ4).
View Article and Find Full Text PDFThis study assessed the degree to which the racial composition of one's neighborhood was related to the racial socialization messages parents communicated to their children in a sample of 307 African American families. Linear regression analyses were conducted. Neighborhoods were classified as predominantly African American, predominantly European American, or racially integrated.
View Article and Find Full Text PDFIntroduction: Glucose hypometabolism and tau formation are key features of Alzheimer's disease (AD). Less is known about the relationship between fasting glucose and regional tau accumulation.
Methods: Cerebrospinal fluid (CSF) glucose was linearly regressed on regional tau (flortaucipir) among 169 Alzheimer's Disease Neuroimaging Initiative (ADNI3) participants.