Midge Hunting Scientists Tackle Spread Of Devastating Bluetongue Virus

Scientists at the BBSRC-funded Institute for Animal Health (IAH) are stepping up the battle against the devastating and economically damaging bluetongue virus. By combining crafty ways to trap and television screen midges with cutting edge computer modelling and weather predictions the IAH crew are gaining an understanding of how the insects spread the disease so that they can repair surveillance methods and advise farmers how and when to protect their animals.

The scientists are collecting facts on midge numbers and biting manners from midge-hunting expeditions in southern England. They incorporate this with meteorological data from Met Office colleagues to arise complex mathematical models that can be hand-me-down to affirm under what weather conditions the midges are mostly likely to be flying circa and when they are most in all probability to be giving disease-spreading bites to steading animals. This compel allow the party, led by Dr Simon Carpenter, to advise farmers when it is safest to move susceptible animals and also examine how stabling of animals can be toughened where logistically possible to reduce the jeopardize of infectious midge bites. They will also use this facts to establish best practice for permit of insecticides and timing of vaccination of animals against this economically signal and difficult to control disease.

Lead researcher Dr Simon Carpenter said: “These experiments are vital - it’s about perceptive your enemy. Last year, in northern Europe, bluetongue cost once again £95 million in direct losses alone. And while indirect losses in the UK last year were considerable, we have yet to experience the chuck-full effects of a BTV outbreak as has been seen on the continent. A grave 2008 outbreak could be the source prodigious hardship both to straight affected farmers and, if vaccination coverage is in need, to those living in adjacent to movement condition zones. Hence it is vital that, firstly, as many farmers vaccinate their stock as possible and secondly, we collect basic data to understand how these outbreaks occur and what can be done to slow their progress. We demand to think to ourselves: “when are the midges going to be active and what can we do to house a barrier between our livestock and these midges?” We will use our models to advise on best modus operandi fitted measures such as stabling, insecticide utilize and vaccination, to control the spread of bluetongue virus.”

The band has developed two methods to monitor the flying and wintry behaviour of the Culicoides midge that spreads the complaint, care of particular rise above conditions. The first uses a large grid of known mass mounted on crown of a 4×4 dealings, which is driven through grazing land. By driving at a constant scamper of 20mph concluded a known distance the scientists can precisely calculate the volume of air passing through the criss-cross and so reckon the number of Culicoides midges per cubic metre of air. All of the insects caught in the net are taken back to the lab to sort out the Culicoides midges from other insects, including different midge species.

The second method focuses on the sharp rate of the midges and uses a gargantuan muslin tent, the walls of which are lowered around a penned grazing sheep after an danger period of ten minutes. The scientists then record the tented acreage and collect any midges that have landed on the walls and ceiling of the tent as well as examining the sheep through despite any further severe individuals. These midges can then be analysed in the lab to establish which species is carrying out-dated the cold.

Dr Carpenter continued: “The service perquisites of these techniques is that, until particular recently, midge observation relied upon the abuse of happen traps that sometimes do not represent what is happing on animals particularly well. Using these two techniques we can more easily understand the relationship between ride out conditions and both background midge activity and penetrating attacks, and also predict the level of gamble at remarkable times of the year. These models can then be used along with weather forecasting to guide farmers as to when Culicoides populations are most active and to develop best practice owing controlling the spread of the midges and the virus itself.

“All of this achievement contributes to the aims for change one’s mind knowledge beside Culicoides that were mise en scene out in the European Commons Safety Authority’s ‘Scientific Appreciation on Bluetongue’ published a couple of weeks ago.”

Kevin Pearce, National Farmers Association, said: “Bluetongue is a terrible contagion of ruminant livestock. Our farmers obtain worked intricate to in this virus in the infected areas of the south east and East Anglia through vaccination and vigilance but we recollect that we couldn’t have achieved this without the pains and familiarity of the scientists at IAH. Bluetongue shares its moving vector - the midge - with other imported, but equally serious, diseases such as African Horse Sickness so any appreciation and sapience of the midges’ bearing and breeding patterns are welcome. We wish the experts at IAH success in their endeavours with this project.”

Biotechnology and Biological Sciences Analysis Conference (BBSRC)
http://www.bbsrc.ac.uk