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Migrating Birds Unlikely to Spread Bird Flu, New Research Reveals

by VR Sreeraman on September 04, 2010 at 3:54 PM Bird Flu News

The outbreak of H5N1 'bird flu' virus in South East Asia, during the year 2005, led to widespread fear with predictions that the intercontinental migration of wild birds could lead to global pandemic.

Migrating Birds Unlikely to Spread Bird Flu, New Research Reveals

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But now research published in the British Ecological Society's Journal of Applied Ecology reveals why the global spread of bird flu by direct migration of wildfowl is unlikely but also provides a new framework for quantifying the risk of avian-borne diseases.

The highly pathogenic H5N1 bird flu virus is primarily a disease of poultry, often resulting in mass mortality for infected flocks. However, the virus can also infect other species, including wild birds and humans. Experimental infection has also revealed that some wild ducks, geese and swans can carry the virus asymptomatically, that is before the symptoms of the virus become apparent, meaning that they have the potential to spread the virus as they migrate.

"The potential risks to humans led to extensive media coverage often focusing on migratory birds, which fuelled public concern and led to calls for the mass culling of wild birds," said lead author Dr Nicolas Gaidet. "However, the actual risk of H5N1 spread through migratory birds depended on whether infected individuals were capable of migratory movements while shedding virus, and the distance over which such individuals could travel. Our research has answered these questions using analysis of infection and migratory routes and timings for many bird species."

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Migrating Birds Unlikely to Spread Bird Flu, New Research Reveals

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