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

Download Mobile App





Fast, Portable Test Can Diagnose COVID-19 and Track Variants

By LabMedica International staff writers
Posted on 02 Apr 2021
Print article
Image: The NIRVANA field-test kit (Photo courtesy of Mo Li/KAUST)
Image: The NIRVANA field-test kit (Photo courtesy of Mo Li/KAUST)
Clinicians using a new viral screening test can not only diagnose COVID-19 in a matter of minutes with a portable, pocket-sized machine, but can also simultaneously test for other viruses - like influenza - that might be mistaken for the coronavirus.

The new test, dubbed NIRVANA, has been developed by researchers at The Salk Institute for Biological Studies (La Jolla, CA, USA) and can also sequence the SARS-CoV-2 virus, providing valuable information on the spread of COVID-19 mutations and variants.

Currently, the standard approach to determining whether a nasal swab is positive for COVID-19 is to run a polymerase chain reaction (PCR) test to detect genetic material from the SARS-CoV-2 virus. If the sample is negative, however, patients and clinicians don’t get any information on what might be causing the coronavirus-like symptoms - nless they run separate PCR tests, using different swab samples, for other viruses. And if the sample is positive for SARS-CoV-2, they don’t learn which COVID-19 variant a patient is infected with unless another set of tests is run; those require a large and expensive next-generation gene-sequencing machine.

Researchers at The Salk Institute attempted to find out whether a gene-detection approach called isothermal recombinase polymerase amplification (RPA) coupled with real-time nanopore sequencing might be more useful—and faster, cheaper and more portable - than the current COVID-19 testing approach. Unlike PCR, which cycles through lower and higher temperatures to separate DNA strands and copy them, RPA uses proteins—rather than temperature changes—to accomplish the same thing in only 20 minutes. The technology lets researchers copy longer stretches of DNA, and probe for multiple genes at the same time.

The researchers have developed a small, portable device that can screen 96 samples at the same time using the RPA assay. They call the method NIRVANA, for “nanopore sequencing of isothermal rapid viral amplification for near real-time analysis.” The scientists designed NIRVANA to simultaneously test samples for COVID-19, influenza A, human adenovirus, and non-SARS-CoV-2 human coronavirus. In just 15 minutes, the researchers report, the device begins to report positive and negative results. And within three hours, the device finalizes results on all 96 samples—including the sequences of five regions of SARS-CoV-2 that are particularly prone to accumulate mutations leading to new variants such as the B.1.1.7 variant identified in the UK.

The researchers tested NIRVANA on 10 samples known to be positive for SARS-CoV-2, 60 samples of unknown SARS-CoV-2 status, as well as samples of municipal wastewater harboring the SARS-COV-2 virus and others. In all cases, the assay was able to correctly identify which viruses were present. The sequencing data also allowed them to narrow down the origin of SARS-CoV-2 in positive samples; differentiating strains from China and Europe, for instance. With the small size and portability of the NIRVANA workflow, it could be used for fast virus detection at schools, airports or ports, the researchers say. It also could be used to monitor wastewater or streams for the presence of new viruses.

“This is a virus detection and surveillance method that doesn’t require an expensive infrastructure like other approaches,” said Juan Carlos Izpisua Belmonte, co-corresponding author and a professor in Salk’s Gene Expression Laboratory. “We can accomplish with one portable test the same thing that others are using two or three different tests, with different machines, to do.”

Related Links:
The Salk Institute for Biological Studies

Platinum Member
COVID-19 Rapid Test
OSOM COVID-19 Antigen Rapid Test
One Step HbA1c Measuring System
GREENCARE A1c
Complement 3 (C3) Test
GPP-100 C3 Kit
Gold Member
SARS-CoV-2 Test
One Step SARS-CoV-2 Nucleic Acid Detection Kit (P761H)

Print article

Channels

Clinical Chemistry

view channel
Image: Reaching speeds up to 6,000 RPM, this centrifuge forms the basis for a new type of inexpensive, POC biomedical test (Photo courtesy of Duke University)

POC Biomedical Test Spins Water Droplet Using Sound Waves for Cancer Detection

Exosomes, tiny cellular bioparticles carrying a specific set of proteins, lipids, and genetic materials, play a crucial role in cell communication and hold promise for non-invasive diagnostics.... Read more

Molecular Diagnostics

view channel
Image: The cobas Malaria test is the first FDA-approved molecular test to screen U.S. blood donors for malaria (Photo courtesy of Roche)

First FDA-Approved Molecular Test to Screen Blood Donors for Malaria Could Improve Patient Safety

Malaria, a serious illness that often leads to death, is spread by a specific mosquito species that infect humans with a parasite. Other transmission modes include blood transfusions, organ transplants,... Read more

Hematology

view channel
Image: The low-cost portable device rapidly identifies chemotherapy patients at risk of sepsis (Photo courtesy of 52North Health)

POC Finger-Prick Blood Test Determines Risk of Neutropenic Sepsis in Patients Undergoing Chemotherapy

Neutropenia, a decrease in neutrophils (a type of white blood cell crucial for fighting infections), is a frequent side effect of certain cancer treatments. This condition elevates the risk of infections,... Read more

Pathology

view channel
Image: The medical office procedure detects the key biomarker in Parkinson’s and related neurodegenerative diseases (Photo courtesy of BIDMC)

Simple Skin Biopsy Test Detects Parkinson’s and Related Neurodegenerative Diseases

Parkinson's disease and a group of related neurodegenerative disorders known as synucleinopathies impact millions globally. These conditions, including Parkinson’s disease (PD), dementia with Lewy bodies... Read more
Copyright © 2000-2024 Globetech Media. All rights reserved.