Bird flu pattern puzzles experts

The way avian flu has spread into Africa and Europe is puzzling scientists who admit they don't fully understand how the virus is being spread.

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<p><a href="http://www.physorg.com/news11308.html">Bird flu pattern puzzles experts</a></p> <p>The way avian flu has spread into Africa and Europe is puzzling scientists who admit they don't fully understand how the virus is being spread.</p>