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Updated: Apr 11, 2026
Multiplexed Isothermal Amplification Based Diagnostic Platform to Detect Zika, Chikungunya, and Dengue 1
Published on: March 13, 2018
Collaborative study for the characterization of a chikungunya virus RNA reference reagent for use in nucleic acid
G Añez1, Z Jiang2, D A R Heisey1
1Office of Blood Research and Review, Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Bethesda, MD, USA.
Background And Objectives:
Infections with the mosquito-borne chikungunya virus (CHIKV) can cause febrile illness or be asymptomatic. Laboratory diagnosis of CHIKV is often made with laboratory-developed nucleic acid amplification technology (NAT) assays because there are no U.S. Food and Drug Administration (FDA)-approved diagnostic or blood screening assays. We aimed to produce a well-characterized CHIKV RNA reference reagent (CHIKV-RR) for use in NAT assays.
Materials And Methods:
A CHIKV RNA-RR consisting of cell culture-grown, heat-inactivated CHIKV diluted in human plasma was assessed by 8 laboratories in a collaborative study. The participants were asked to test the CHIKV-RR using their NAT assay(s) by qualitative testing (determination of RNA end-point by testing log and half-log dilutions followed by calculation of estimated NAT-detectable units/ml, after adjustment for the sample volume used for testing), and by quantitative testing, when available.
Results:
Results from the testing showed that the CHIKV-RR had an estimated overall mean of 7.56 log10 detectable units/ml, ranging from 6.2 log10 to 8.6 log10.
Conclusions:
The Center for Biologics for Evaluation and Research/FDA CHIKV RNA-RR for NAT was established with a concentration of 7.56 log10 detectable units/ml.
