NEWS
Thu Apr 4, 2013 06:46 AM CDT

(AP) -- Earlier this week, a bird flu virus never before found in humans grabbed world attention after it infected and killed people in China. Scientists have since been scrambling to understand how it happened and, more importantly, whether it poses a risk to public health or could potentially spark a global pandemic.

The good news is that so far there's no sign that the H7N9 virus is spreading from person to person, but experts say it has mutated in a way that has them a bit worried. Here's a crash course in Bird Flu 101 to help explain what's ...

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