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Presence of Antibodies against Bluetongue Virus (BTV) in Sheep 5 to 7.5 Years after Vaccination with Inactivated BTV-8 Vaccines
Open AccessArticle

Emergence of a Novel Reassortant Strain of Bluetongue Serotype 6 in Israel, 2017: Clinical Manifestations of the Disease and Molecular Characterization

1
Kimron Veterinary Institute, Division of Virology, Beit Dagan 50250, Israel
2
School of Molecular Cell Biology Biotechnology, Tel Aviv University, Tel Aviv 69978, Israel
3
Hachaklait veterinary services, Caesarea 3088900, Israel
4
Indi-Vet Ltd., Ashdod 7764933, Israel
5
Dr. Amos Bareli LTD, Kiryat Tiv’on 3605141, Israel
6
Lamikne veterinary services, Kiryat Tiv’on 3603247, Israel
*
Authors to whom correspondence should be addressed.
Viruses 2019, 11(7), 633; https://doi.org/10.3390/v11070633
Received: 14 May 2019 / Revised: 3 July 2019 / Accepted: 9 July 2019 / Published: 10 July 2019
(This article belongs to the Special Issue Virus-Vector-Host Interactions of Culicoides-Borne Diseases)
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Abstract

Reassortment contributes to the evolution of RNA viruses with segmented genomes, including Bluetongue virus (BTV). Recently, co-circulation of natural and vaccine BTV variants in Europe, and their ensuing reassortment, were proposed to promote appearance of novel European BTV strains, with potential implications for pathogenicity, spread and vaccination policies. Similarly, the geographical features of the Mediterranean basin, which spans over portions of three continents, may facilitate the appearance of clinically relevant reassortants via co-circulation of BTV strains of African, Asian and European origins. In August–October 2017, BTV serotype 6 (BTV-6) was identified in young animals exhibiting classical clinical signs of Bluetongue (BT) at Israeli sheep and cattle farms. Sequencing and pairwise analysis of this Israeli BTV-6 isolate revealed the closest sequence homology of its serotype-defining Segment 2 was with that of South African reference BTV-6 strain 5011 (93.88% identity). In contrast, the other viral segments showed highest homology (97.0%–99.47% identity) with BTV-3, -4 and -9 of Mediterranean and African origins. Specifically, four viral segments were nearly identical (99.13%–99.47%), with Tunisian and Italian BTV-3 strains (TUN2016 and SAD2018, correspondingly). Together, our data suggest that Mediterranean co-circulation and reassortment of BTV-3 and BTV-6 drove the emergence of a novel and virulent BTV-6 strain View Full-Text
Keywords: bluetongue virus; orbivirus; Reoviridae; sequencing; phylogenetic analysis; diagnostics; spread; descriptive epidemiology bluetongue virus; orbivirus; Reoviridae; sequencing; phylogenetic analysis; diagnostics; spread; descriptive epidemiology
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Golender, N.; Eldar, A.; Ehrlich, M.; Khinich, Y.; Kenigswald, G.; Varsano, J.S.; Ertracht, S.; Abramovitz, I.; Assis, I.; Shlamovitz, I.; Tiomkin, E.; Yonay, E.; Sharir, B.; Bumbarov, V.Y. Emergence of a Novel Reassortant Strain of Bluetongue Serotype 6 in Israel, 2017: Clinical Manifestations of the Disease and Molecular Characterization. Viruses 2019, 11, 633.

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