Experts have long feared the H5N1 bird flu virus, which swept through much of Asia early this year, could mutate into a form that could be passed from person to person and set off a pandemic like the one in 1918, which killed 20 million people.
Experts believe this is a fluke rather than a new, virulent flu strain. Note that at least 20 million people died of the Spanish flu; the real numbers may be twice that.
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