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Effect of temperature and regional origin on the vector capacity of British and European Culicoides spp. - SE2610

Description

The effects of the 1998-2001 BT epizootic in southern Europe have been exacerbated by an expansion in the geographical range of the major Old World vector, C. imicola, and by the involvement of so-far unidentified but novel Culicoides vector(s). This has meant that BTV now extends more widely and more northerly than ever before in Europe.

In the light of the above and the perceived increased threat to the UK this research project addresses MAFF requirements and requests for commissioned work on the vector capacity of UK & European Culicoides spp. The objectives of the work are as follows:

To test the vector competence of British potential vector species of Culicoides (especially C. obsoletus and C. pulicaris group midges) for BTV, paying particular regard to detecting any regional (geographic) variations in susceptibility that may occur within a vector species.

To investigate the effects of ambient temperature in modifying vector competence of Culicoides spp. for BTV, including the possibility of facilitating transovarial transmission of the virus.

To investigate the bioclimatic envelope of C. imicola, the major European BTV vector, in order to assess the likelihood of this species surviving and transmitting BTV in the UK ,under current and predicted climatic (global warming) scenarios.








Objective
1. To measure the vector competence, for BTV, of populations of C. obsoletus, C. pulicaris and other
potential vector species of Culicoides originating from widely varying locations in the UK in order
to gain a true estimate of the risk of BTV transmission in the country.

2. To identify, from the findings of objective 1, the locations of any Culicoides populations with high levels of competence so that areas at high risk of BTV transmission can be demarcated and the appropriate disease control measured designed in advance of any disease incursion.

3. To investigate the effects of ambient temperature in modifying vector competence for BTV, including the
possibility of facilitating transovarial transmission of the virus.

4. To investigate the bioclimatic envelope of C. imicola, the major European BTV vector, to assess the
likelihood of this species surviving as a population in the UK should it gain entrance to this country.

Project Documents
• Final Report : Effect of temperature and regional origin on the vector capacity of British and European culicoides spp. for bluetongue virus   (169k)
• Final Report - Annex : Effect of temperature and regional origin on the vector capacity of British and European culicoides spp. for bluetongue virus   (2479k)
Time-Scale and Cost
From: 2002

To: 2005

Cost: £447,300
Contractor / Funded Organisations
Institute for Animal Health (BBSRC)
Keywords
Animal Diseases              
Animal Health              
Biotechnology              
Bluetongue              
Epidemiology              
Plants and Animals              
Transmission              
Fields of Study
Animal Health