Related Experiment Video
Updated: Aug 14, 2026
Rapid Diagnosis of Avian Influenza Virus in Wild Birds: Use of a Portable rRT-PCR and Freeze-dried Reagents in the Field
Published on: August 2, 2011
Development of RT-RPA-based point-of-care tests for epidemic arthritogenic alphaviruses
Abstract:
Chikungunya (CHIKV), o'nyong-nyong (ONNV), and Mayaro (MAYV) viruses are transmitted by mosquitoes and known to cause a debilitating arthritogenic syndrome. These alphaviruses have emerged and re-emerged, leading to outbreaks in tropical and subtropical regions of Asia, South America, and Africa. Despite their prevalence, there persists a critical gap in the availability of sensitive and virus-specific point-of-care (POC) diagnostics. Traditional immunoglobulin-based tests such as enzyme-linked immunosorbent assay (ELISAs) often yield cross-reactive results due to the close genetic relationship between these viruses. Molecular diagnostics such as quantitative polymerase chain reaction (qPCR) offer high sensitivity but are limited by the need for specialized laboratory equipment. Recombinase polymerase amplification (RPA), an isothermal amplification method, is a promising alternative to qPCR, providing rapid results with minimal equipment requirements. Here, we report the development and validation of three virus-specific RPA-based POC tests for CHIKV, ONNV, and MAYV. These tests demonstrated both speed and sensitivity, capable of detecting 10 viral copies within 20 minutes of amplification, without exhibiting cross-reactivity. Furthermore, we evaluated the clinical potential of these tests using serum and tissue samples from CHIKV, ONNV, and MAYV-infected mice, as well as CHIKV-infected human patients. We demonstrate that the RPA amplicons derived from the patient samples can be sequenced, enabling cost-effective molecular epidemiological studies. Our findings highlight the significance of these rapid and specific POC diagnostics in improving the early detection and management of these arboviral infections.
Insights
New point-of-care diagnostic tests for Chikungunya (CHIKV), o'nyong-nyong (ONNV), and Mayaro (MAYV) viruses offer rapid and specific detection. These recombinase polymerase amplification (RPA) tests can identify 10 viral copies in 20 minutes, improving arboviral infection management.
Area of Science:
- Medical Entomology
- Virology
- Molecular Diagnostics
Background:
- Chikungunya (CHIKV), o'nyong-nyong (ONNV), and Mayaro (MAYV) are mosquito-borne alphaviruses causing arthritogenic syndromes, with outbreaks in tropical and subtropical regions.
- Existing diagnostics like ELISAs lack specificity due to cross-reactivity, while qPCR requires specialized laboratory equipment.
- There is a critical need for sensitive, specific, and accessible point-of-care (POC) diagnostics for these emerging arboviruses.
Purpose of the Study:
- To develop and validate sensitive, virus-specific point-of-care (POC) diagnostic tests for CHIKV, ONNV, and MAYV.
- To assess the utility of recombinase polymerase amplification (RPA) for rapid alphavirus detection.
- To evaluate the clinical applicability of RPA tests in animal models and human patients.
Main Methods:
- Development of three distinct RPA-based assays targeting CHIKV, ONNV, and MAYV.
- Validation of RPA test sensitivity (limit of detection) and specificity (cross-reactivity).
- Testing of RPA assays on serum and tissue samples from infected mice and humans.
Main Results:
- Developed virus-specific RPA POC tests for CHIKV, ONNV, and MAYV.
- Tests achieved high sensitivity, detecting 10 viral copies within 20 minutes without cross-reactivity.
- RPA assays successfully detected viruses in clinical samples, and amplicons were sequenceable for epidemiological studies.
Conclusions:
- These rapid and specific RPA-based POC diagnostics significantly improve early detection and management of CHIKV, ONNV, and MAYV infections.
- The technology facilitates molecular epidemiological studies, aiding in understanding arboviral disease spread.
- The findings underscore the potential of RPA for decentralized diagnostics in resource-limited settings.
More Related Videos
07:40Field Postmortem Rabies Rapid Immunochromatographic Diagnostic Test for Resource-Limited Settings with Further Molecular Applications
Published on: June 29, 2020
07:59Rapid and Specific Detection of Acinetobacter baumannii Infections Using a Recombinase Polymerase Amplification/Cas12a-based System
Published on: April 25, 2025
