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Vectors of bluetongue get a name
Date:10/6/2011

Scientists of the Antwerp Institute of Tropical Medicine (ITG) have developed a molecular technique to easily and dependably identify the biting midges that spread bluetongue disease. Until know this identification was a problem. The technology helps to understand how the disease spreads, and how to control it. They report in the journal Medical and Veterinary Entomology.

Bluetongue primarily affects sheep, but also cattle and other ruminants. It is not dangerous to people, but it causes great economical damage. Until a few years ago, the disease did not hit northern Europe. People assumed only tropical midges could transfer the responsible virus. Also, the virus did only replicate in the midges above 15 C, and often even higher. But in 2006 The Netherlands and Belgium were hit. Once the virus was present, local midges showed to be capable of transmitting it.

There are a lot of species called 'biting midge' (Cullicoides to biologists), and with classical tools it is almost unfeasible to differentiate them there is a reason why they are popularly called no-see-ums. You have to put them under a microscope and measure minuscule details like the dimensions of the genitals. Work for specialists, and even then.

But if you don't know which midges transmit the disease, you don't know where it will spread, nor where you have to fight the midges those little bugs there over that muck, should I be afraid or not? And if you want your pest control to be efficient and ecologically sound, you'll have to know who's the enemy, and who isn't.

So the ITG researchers developed a simple and cheap molecular identification technology that identifies Cullicoides species in the lab with 100% certainty. They concentrated on the most important species in northern Europe, Culicoides obsoletus, C. scoticus, C. chiopterus and C. dewulfi, but they can reliably identify more than twenty species. Tests on larva
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Contact: Isra Deblauwe
ideblauwe@itg.be
32-324-76528
Institute of Tropical Medicine Antwerp
Source:Eurekalert

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