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Bird flu 101: How bad is the new H7N9 strain?

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A bird flu virus never before found in humans has grabbed world attention this week after it infected and killed people in China. Scientists have 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...