WHO: Deadly bird flu studies to stay secret for now

Related: Cold and flu

1. Cold and flu
   1. Six more diagnosed with new bird flu in China
   2. Higher humidity may thwart flu virus
   3. Flu vaccine barely worked in seniors
   4. New clue shows why some never get a cold
   5. Sniffles, flu, fever: When it's OK to work out
2. Top health stories
   1. Boys with ADHD twice as likely to grow up obese
   2. Olive oil, nuts can protect your brain, study finds
   3. New sleep pill may be unsafe at higher doses, FDA review suggests
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   5. Sleep-deprived teens cause crashes, study shows
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