For Emmanuel Camus, Director of CIRAD's Animal Production and Veterinary Medicine Department, "both types of vector are suspected. The balance may swing one way or the other, depending on the situation ". While legal trade circuits are more or less familiar, it will be less easy to evaluate the role of illegal circuits. As regards the role of migrating wild birds, an initial campaign of 5000 samples has been conducted by CIRAD, in conjunction with the NGO Wetlands International and the FAO, in 14 countries since January 2006.
Their analyses have not revealed any trace of the highly pathogenic H5N1 virus to date. However, we cannot state with any certainty that wild birds are not responsible, since we do not yet have certain data. Conversely, the analyses did reveal the existence of other less pathogenic avian viruses, and provided further information about the ecology of the bird flu virus in the tropics.
A new sampling campaign is scheduled in Africa as of September 2006, at more sites. Moreover, research recently showed that while bird flu viruses are generally found in the cloaca, H5N1 concentration is even higher in the respiratory tract of infected birds. In the next campaign, samples will thus also be taken from the larynx of each bird.
This new sampling operation will be facilitated by better local infrastructures: Africa will shortly have some ten laboratories capable of diagnosing the disease, compared to just one at the end of 2005. Moreover, the CIRAD "Control of Emerging and Exotic Animal Diseases" Research Unit's analysis laboratory in Montpellier should have automatic equipment by the autumn, enabling it to handle up to 400 samples a day and provide more rapid diagnoses.
Over and above the existence of the virus within flocks, researchers also need to understand intracontinental bird movements in particular. In effect, in addition to migration patterns, which have been known for some time, there are also bird movements within Africa, particularly from West to East and South to North, that may play a significant role in spreading the disease. To determine that role, CIRAD is planning to work with Wetlands International and the Wildlife Conservation Society to capture birds early this coming winter and fit them with very lightweight satellite transmitters so as to monitor their movements.
Helen Burford | alfa
New gene for atrazine resistance identified in waterhemp
24.02.2017 | University of Illinois College of Agricultural, Consumer and Environmental Sciences
Researchers discover a new link to fight billion-dollar threat to soybean production
14.02.2017 | University of Missouri-Columbia
In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
13.02.2017 | Event News
10.02.2017 | Event News
09.02.2017 | Event News
24.02.2017 | Life Sciences
24.02.2017 | Life Sciences
24.02.2017 | Trade Fair News