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Transbound Emerg Dis. 2016 Aug;63(4):353-9. doi: 10.1111/tbed.12503. Epub 2016 Apr 19.

Development of a Luminex-Based DIVA Assay for Serological Detection of African Horse Sickness Virus in Horses.

Author information

1
VISAVET Health Surveillance Centre, Universidad Complutense Madrid, Madrid, Spain.
2
Animal Health Department, Universidad Complutense Madrid, Madrid, Spain.
3
CEI Campus Moncloa, UCM-UPM, Madrid, Spain.
4
Animal Health Laboratory, French Agency for Food, Environmental and Occupational Health and Safety (ANSES), UPE, UMR 1161 ANSES, INRA, ENVA, Maisons-Alfort, France.

Abstract

African horse sickness (AHS) is considered a fatal re-emergent vector-borne disease of horses. In the absence of any effective treatment for AHS, vaccination remains the most effective form of disease control. The new generation of vaccines, such as one based on purified, inactivated AHS virus (AHSV, serotype 4), which does not induce antibodies against non-structural protein 3 (NS3), enables the development of diagnostic methods that differentiate infected from vaccinated animals (DIVA assays). As detecting AHS in AHSV-free countries may lead to restrictions on international animal movements and thereby cause significant economic damage, these DIVA assays are crucial for reducing movement restrictions. In this article, we describe a Luminex-based multiplex assay for DIVA diagnosis of AHS, and we validate it in a duplex format to detect antibodies against structural protein 7 (VP7) and NS3 in serum samples from horses vaccinated with inactivated AHSV4 vaccine or infected with a live virus of the same serotype. Results of the Luminex-based assay for detecting anti-NS3 antibodies showed good positive correlation with results from an in-house enzyme-linked immunosorbent assay (ELISA). Thus, the Luminex-based technique described here may allow multiplex DIVA antibody detection in a single sample in less than 2 h, and it may prove adaptable for the development of robust, multiplex serological assays.

KEYWORDS:

African horse sickness; DIVA diagnosis; NS3; VP7; antibody detection; movement restriction

PMID:
27090377
DOI:
10.1111/tbed.12503
[Indexed for MEDLINE]

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