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CDC: Flu season worst in years, vaccine ineffective

  • Story Highlights
  • Based on adult deaths from flu, pneumonia, season is worst since 2003-2004
  • Study: Vaccine was only 44 percent effective
  • Flu vaccine is often between 70 and 90 percent effective
  • Study: Vaccine didn't work at all against the Type B virus
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From the Blogs: Controversy, commentary, and debate

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