WHO: H5N1 virus mutated slightly in family

Related: Bird Flu

1. Infectious diseases
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   2. Mystery illness strikes 7 in Ala.; 2 dead
   3. New SARS cousin finally has a name : MERS
   4. SARS-like virus spreads to health workers
   5. CDC: 2012 was deadliest year for West Nile in US
2. Top health stories
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   2. New Middle East virus spread in hospitals
   3. AMA supports use of sunscreen in schools
   4. HPV infections fell by half in teen girls after vaccine, study shows
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