Potentially fatal bird flu viruses can spread on the wind, a hitherto suspected but unproven route of transmission.
Usually, people catch bird flu through close physical contact with each other or, much more commonly, with infected poultry.
The newly identified capacity for wind to spread it opens up a potential route by which the viruses can spread between farms.
The finding came about after Dutch researchers studied an outbreak of the avian flu strain H7N7 in poultry on Dutch farms in 2003, which resulted in 89 confirmed human infections including one death.
http://www.newscientist.com/article/dn23029-avian-flu-virus-learns-to-fly-without-wings.html
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