We use cookies to understand how you use our site and to improve your experience. This includes personalizing content and advertising. To learn more, click here. By continuing to use our site, you accept our use of cookies. Cookie Policy.

Features Partner Sites Information LinkXpress
Sign In
Advertise with Us
LGC Clinical Diagnostics

FUJIREBIO

Fujirebio is a global leader in the field of IVD testing with more than 50 years’ experience in the conception, devel... read more Featured Products: More products

Download Mobile App





Novel SARS CoV-2 Rapid Antigen Test Validated for Diagnostic Accuracy

By LabMedica International staff writers
Posted on 01 Nov 2022
Print article
Image: The ESPLINE SARS-CoV-2 is for in vitro diagnostic (IVD) use with immunochromatographic assay for the detection of SARS-CoV-2 antigen directly from nasopharyngeal swab fluid and is intended for use as an aid in the diagnosis of SARS-CoV-2 infection (Photo courtesy of Fujirebio)
Image: The ESPLINE SARS-CoV-2 is for in vitro diagnostic (IVD) use with immunochromatographic assay for the detection of SARS-CoV-2 antigen directly from nasopharyngeal swab fluid and is intended for use as an aid in the diagnosis of SARS-CoV-2 infection (Photo courtesy of Fujirebio)

Many health care providers are hopeful regarding COVID-19 testing programs that use accurate rapid antigen tests to reduce the burden on the health care system through early diagnosis of infection. Currently, various antigen-detecting rapid diagnostic tests (Ag-RDTs) for SARS-CoV-2 are commercially available.

The widespread use of testing outside medical institutions suggests that anterior nasal specimens, which can be safely self-collected by the patient, are now being used instead of nasopharyngeal specimens collected by medical staff. Therefore, to evaluate the usefulness of specimens collected from the anterior nasal cavity, understanding the viral load and diagnostic accuracy of tests performed using anterior nasal specimens is vital.

Pediatricians at the Jichi Medical University (Tochigi, Japan) and their colleagues conducted a prospective cross-sectional study from February 12, 2021 to September 30, 2021. They enrolled 16 patients (age range, <1 month-76 years) and samples were collected simultaneously from anterior nasal and nasopharyngeal sites continuously during hospitalization. The primary end points were the diagnostic accuracy of the Ag-RDT and utility of anterior nasal specimens.

The scientists determined the diagnostic performance of the RapidTesta SARS-CoV-2 test (Sekisui Medical Co., Ltd., Tokyo, Japan) and compare it with that of RT-PCR, using specimens collected from the anterior nasal and nasopharyngeal sites. Furthermore, ESPLINE SARS-CoV-2 (Fujirebio Co., Ltd., Tokyo, Japan), an Ag-RDT that has been marketed and widely used since May 2020, was used as a comparator representing the efficacy of common Ag-RDTs.

Four specimen swabs were taken simultaneously from each patient on admission: an anterior nasal and nasopharyngeal specimen from each nostril and also repeat samples. To judge the RapidTesta SARS-CoV-2 results objectively, the team evaluated the results using the RapidTesta Reader after visual assessment. RNA extraction was performed using the QIAamp Viral RNA Mini Kit (Qiagen, Hilden, Germany) with a 140-µL aliquot of each sample. A one-step RT-PCR (Thermo Fisher Scientific, Waltham, MA, USA) was performed which targets nucleotide 2 gene-specific primers for SARS-CoV-2.

The investigators reported that in total 226 sets of paired samples were obtained. In 88.2% of specimens, the viral load was high at the nasopharyngeal site. The mean cycle threshold values for the anterior nasal and nasopharyngeal sites were 32.4 and 29.9, respectively. Using the real-time polymerase chain reaction results as a reference, the Ag-RDT showed a 100% sensitivity up to day 6 of the illness, using specimens with moderate or high viral load (cycle threshold <30) from either site. From day 7, the sensitivity was 70.4% - 90.6% and 83.9% - 84.6% for the anterior nasal and nasopharyngeal sites, respectively. The specificity remained at 100%.

The authors concluded that they had demonstrated the diagnostic accuracy of the newly developed RapidTesta SARS-CoV-2 test for the accurate diagnosis of COVID-19 in terms of both sensitivity and specificity. The anterior nasal cavity was shown to be useful as a specimen collection site. The study was published on November 1, 2022 in the International Journal of Infectious Diseases.

Related Links:
Jichi Medical University
Sekisui Medical Co., Ltd
Fujirebio
Thermo Fisher Scientific

Platinum Member
COVID-19 Rapid Test
OSOM COVID-19 Antigen Rapid Test
HLX
Anti-Cyclic Citrullinated Peptide Test
GPP-100 Anti-CCP Kit
Gold Member
SARS-CoV-2 Reactive & Non-Reactive Controls
Qnostics SARS-CoV-2 Typing

Print article

Channels

Clinical Chemistry

view channel
Image: Wireless Point-of-Care Testing for Hepatitis B Virus (Photo courtesy of Chulalongkorn University)

Wireless Hepatitis B Test Kit Completes Screening and Data Collection in One Step

Hepatitis B, a significant global health concern, is responsible for chronic liver diseases like cirrhosis and liver cancer which is one of the most common cancers worldwide. The challenge with hepatitis... Read more

Molecular Diagnostics

view channel
Image: Aptiva utilizes particle-based multi-analyte technology (PMAT) (Photo courtesy of Werfen)

Novel Immunoassays Enable Early Diagnosis of Antiphospholipid Syndrome

Antiphospholipid syndrome (APS) is an autoimmune disorder that typically presents as venous or arterial thrombosis and/or pregnancy loss. Diagnosing APS can be difficult as its symptoms often resemble... Read more

Hematology

view channel
Image: The Gazelle Hb Variant Test (Photo courtesy of Hemex Health)

First Affordable and Rapid Test for Beta Thalassemia Demonstrates 99% Diagnostic Accuracy

Hemoglobin disorders rank as some of the most prevalent monogenic diseases globally. Among various hemoglobin disorders, beta thalassemia, a hereditary blood disorder, affects about 1.5% of the world's... Read more

Pathology

view channel
Image: The photoacoustic spectral response sensing instrument is based on low-cost laser diodes (Photo courtesy of Khan et al., doi 10.1117/1.JBO.29.1.017002)

Compact Photoacoustic Sensing Instrument Enhances Biomedical Tissue Diagnosis

The pursuit of precise and efficient diagnostic methods is a top priority in the constantly evolving field of biomedical sciences. A promising development in this area is the photoacoustic (PA) technique.... Read more

Industry

view channel
Image: The companies will develop genetic testing systems based on capillary electrophoresis sequencers (Photo courtesy of 123RF)

Sysmex and Hitachi Collaborate on Development of New Genetic Testing Systems

Sysmex Corporation (Kobe, Japan) and Hitachi High-Tech Corporation (Tokyo, Japan) have entered into a collaboration for the development of genetic testing systems using capillary electrophoresis sequencers... Read more
Copyright © 2000-2024 Globetech Media. All rights reserved.