Rapid visual detection of dengue virus by combining reverse transcription recombinase-aided amplification with lateral-flow dipstick assay.
Int J Infect Dis
; 95: 406-412, 2020 Jun.
Article
in En
| MEDLINE
| ID: mdl-32272263
ABSTRACT
OBJECTIVES:
Dengue caused by infection with the dengue virus (DENV) is endemic in the tropical and subtropical regions of the world and of greatest public health concern. With more large outbreaks in rural areas, the purpose of this study was to develop a point-of-care test using recombinase-aided amplification and lateral-flow dipsticks for rapidly detecting DENV in low-resource settings.METHODS:
The primers for the recombinase-aided amplification (RAA) assay were designed based on 3' UTR of the DENV genome and screened. The RAA temperature, time and the concentration of primers were then optimized, as well as the lateral-flow dipstick assay (LFD) time. Finally, the diagnostic performance of the reverse transcription (RT)-RAA-LFD assay was evaluated using blood samples from 247 patients who were clinically suspected to be infected with DENV.RESULTS:
The RAA primer pair F1/R2 was the optimal combination for detecting DENV. The RT-RAA was performed in an incubator block at 37°C for 20minutes, and the amplicons were visible in the flow dipsticks from a naked eye within 3minutes. The detection limit of the developed RT-RAA-LFD assay was 10 copies/µL with high specificity for DENV. Compared with commercial reverse transcription quantitative PCR assay, the kappa value of RT-RAA-LFD in the 247 clinical samples was 0.957.CONCLUSIONS:
In this study, a rapid and visual point-of-care test based on RT-RAA and LFD assay was developed. It was found to be suitable for reliable detection of DENV in low-resource settings with limited laboratory capabilities and optimal storage conditions.Key words
Full text:
1
Collection:
01-internacional
Health context:
3_ND
Database:
MEDLINE
Main subject:
Immunoassay
/
Nucleic Acid Amplification Techniques
/
Dengue Virus
/
Reverse Transcription
Type of study:
Diagnostic_studies
/
Evaluation_studies
Limits:
Humans
Language:
En
Journal:
Int J Infect Dis
Year:
2020
Document type:
Article