Bird Flu Is Slamming Factory Farms But Sparing Backyard Flocks. Why?

By Tom Philpott | Wed May 20, 2015

But it's largely leaving backyard flocks unscathed. Why?

http://www.motherjones.com/tom-philpott/2015/05/ongoing-bird-flu-crisis-stumps-experts
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Arty turns 10 this summer.