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Background: Bluetongue virus serotype 3 (BTV-3) was detected for the first time in cattle and sheep in southern England in 2023, the first UK BTV incursion for more than 15 years. Clinical signs were not observed, yet severe clinical disease and mortality were reported during recent BTV-3 outbreaks in northern Europe.
Methods: To investigate the clinical disease and infection kinetics associated with this UK BTV-3 strain, five British sheep were infected with a UK BTV-3 isolate using Culicoides biting midges.
Culicoides and midge-associated arboviruses on cattle farms in Yunnan Province, China.
Parasite
November 2024
Yunnan Tropical and Subtropical Animal Virus Diseases Laboratory, Yunnan Animal Science and Veterinary Institute, Fengyu Road, Panlong District, Kunming 650224, Yunnan, China - Key Laboratory of Transboundary Animal Diseases Prevention and Control (Co-construction by Ministry and Province), Ministry of Agriculture and Rural Affairs, Fengyu Road, Panlong District, Kunming 650224, Yunnan, China.
Article Synopsis
- - Culicoides spp., small biting midges, are important vectors of viruses like African horse sickness and bluetongue that affect livestock; a study in Yunnan Province, China examined their diversity and abundance on two cattle farms from March 2022 to March 2023.
- - Light traps collected 19 species of Culicoides, with C. oxystoma being the most prevalent, making up over 63% of the total 8,343 specimens; 10 species were screened for several viruses using RT-qPCR.
- - Notably, one strain of Yunnan Orbivirus was isolated from cattle blood, and the first connection between a totivirus (YSToV) and Culicoides was found
Validation of a molecular multiplex assay for the simultaneous detection and differentiation of bluetongue virus and epizootic haemorrhagic disease virus in biological samples.
J Virol Methods
February 2025
Istituto Zooprofilattico Sperimentale dell'Abruzzo e del Molise, Campo Boario, Teramo 64100, Italy. Electronic address:
Article Synopsis
- Bluetongue virus (BTV) and epizootic haemorrhagic disease virus (EHDV) are viruses spread by biting midges that cause serious diseases in ruminants, and they circulate in different forms (serotypes).
- A new EHDV strain (serotype 8) was first found in Tunisia in 2021 and later identified in cattle in Italy, Spain, Portugal, and France in 2022, where BTV is already a concern.
- Researchers developed a TaqMan RT-qPCR assay that efficiently detects and differentiates BTV and EHDV, providing a quick and cost-effective method for diagnosis, aiding in better surveillance and control of these diseases.
Detection and evolutionary characterization of arboviruses in mosquitoes and biting midges on Hainan Island, China, 2019-2023.
PLoS Negl Trop Dis
October 2024
Key Laboratory of Virology and Biosafety, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, Hubei, China.
Article Synopsis
- * A total of 32,632 mosquitoes and 21,000 biting midges were collected, revealing the presence of several viruses including Japanese encephalitis virus (JEV), Tembusu virus (TMUV), Getah virus (GETV), Oya virus (OYAV), and Bluetongue virus (BTV), with varying infection rates across different locations.
- * Notably, JEV and TMUV strains were isolated for the first time on the island, and BTV was also reported for the first time, highlighting
Exceptional Bluetongue virus (BTV) and Epizootic hemorrhagic disease virus (EHDV) circulation in France in 2023.
Virus Res
December 2024
ANSES/INRAE/ENVA-UPEC, UMR 1161 Virology, Laboratoire de santé animale, 14 rue Pierre et Marie Curie, 94700 Maisons-Alfort, France.
Article Synopsis
- - Bluetongue (BT) and Epizootic Hemorrhagic Disease (EHD) are important animal diseases impacting cattle and sheep, caused by viruses transmitted by biting midges, with recent outbreaks noted in France during the summer of 2023.
- - Genomic analysis revealed three viruses involved in the outbreaks: EHDV-8, which matches strains found in southern Europe since 2021, and two different strains of BTV, including a novel BTV-8 strain and an established BTV-4 strain.
- - The 2023 outbreaks indicate unusual dynamics in the circulation and emergence of these viruses in France, prompting further investigation into the epidemiological factors contributing to their spread.
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