Scientists find gene that can make flu a killer

Related: Cold and flu

1. Cold and flu
   1. 'Mystery' illness in Alabama mostly cold and flu, tests show
   2. New, stripped-down particle may make better vaccine
   3. Six more diagnosed with new bird flu in China
   4. Higher humidity may thwart flu virus
   5. Flu vaccine barely worked in seniors
2. Top health stories
   1. Brain overload explains lost childhood memories
   2. Bring back PE: Exercise should be 'core' class, report says
   3. 'Mystery' illness in Alabama mostly cold and flu, tests show
   4. H7N9 bird flu spreads much like ordinary flu
   5. Alzheimer's drug was too good to be true, studies find
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