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
Technopath Clinical Diagnostics - An LGC Company

Download Mobile App


ATTENTION: Due to the COVID-19 PANDEMIC, many events are being rescheduled for a later date, converted into virtual venues, or altogether cancelled. Please check with the event organizer or website prior to planning for any forthcoming event.

Paper-Based Portable Diagnostic Platform Accurately Detects Mosquito-Borne Diseases Under Field Conditions

By LabMedica International staff writers
Posted on 09 Mar 2022
Print article
Image: A `lab-in-a-box`, the PLUM reader (Portable, Low-cost, User-friendly, Multimode), presents results from up to 384 patient samples and displays them in a single image capture (Photo courtesy of Livia Guo, LSK Technologies)
Image: A `lab-in-a-box`, the PLUM reader (Portable, Low-cost, User-friendly, Multimode), presents results from up to 384 patient samples and displays them in a single image capture (Photo courtesy of Livia Guo, LSK Technologies)

Field trails conducted in Latin America have shown that a paper-based portable diagnostic platform could accurately detect patients with mosquito-borne diseases with sensitivities equivalent to laboratory PCR tests.

In low-resource settings, resilience to infectious disease outbreaks can be hindered by limited access to diagnostic tests. In response to this limitation, investigators at the University of Toronto (Canada) and the biotech company LSK Technologies (Toronto, Canada) developed a portable diagnostic platform that was a combination of a cell-free, paper-based test and a field-ready companion device that allowed data to be collected using image-based color analysis. Called “PLUM” (Portable, Low-cost, User-friendly, Multimode), the conveniently-sized reader presented results from up to 384 samples and displayed them in a single image capture.

In the initial studies, the platform was optimized for detection of first Zika and then chikungunya viruses with reagents that could be freeze-dried, allowing for distribution without refrigeration

Using RNA extracted from the serum of patient samples collected in Brazil, the investigators found that the combined PLUM reader and paper-based Zika sensor provided analytical sensitivity and specificity for the Zika virus equivalent to RT–qPCR (quantitative real-time PCR) with a diagnostic accuracy of 98.5%. The investigators then demonstrated that by simply changing the molecular components that confer specificity to the assay, they could detect the chikungunya virus with 98.5% accuracy.

“We see emerging diagnostics, like the paper-based tests we have developed, as having tremendous near-term potential to augment existing PCR capacity, improve equity in access to health care, and aid in the responses to public health crises,” said senior author Dr. Keith Pardee, assistant professor of pharmaceutical sciences at the University of Toronto.

A sticking point delaying the field use of the PLUM system is that the extraction of RNA from patient samples requires liquid handling by skilled technicians. “With performance on patient samples now validated, we are tackling these next challenges, like sample preparation, so that the platform and PCR-like diagnostic capacity can be distributed more broadly into the communities where they are needed,” said Dr. Pardee.

The Zika virus field test was described in the March 7, 2022, online edition of the journal Nature Biomedical Engineering.

Related Links:
University of Toronto 
LSK Technologies 

Gold Supplier
Real-Time PCR System
Applied Biosystems QuantStudio 7 Pro Dx
Hemolysing Reagent
Dialyse-BA 5D
Urine Test Strip
HealthMate DA-7
Automated Clinical Chemistry Analyzer

Print article



view channel
Image: Trichinella sp. found in muscle tissue (Photo courtesy of McGill University)

Laboratory Features of Trichinellosis and Eosinophilia Threshold Determined

Trichinella nativa is a nematode worm, one of the species of the genus Trichinella, found in arctic and subarctic regions. It is highly pathogenic and has a high resistance to freezing. It is encapsulated,... Read more


view channel
Image: With Cell IDx’s acquisition, Leica Biosystems will be moving its multiplexing menu forward (Photo courtesy of Leica Biosystems)

Leica Biosystems Acquires Cell IDx, Expanding Offerings in Multiplexed Tissue Profiling

Leica Biosystems, a technology leader in automated staining and brightfield and fluorescent imaging (Nussloch, Germany), has acquired Cell IDx, Inc. (San Diego, CA, USA), which provides multiplex staining... Read more
Copyright © 2000-2022 Globetech Media. All rights reserved.