The weaker-than-expected performance of the flu vaccine in the US this season may be due to production problems with egg-based products, Acting CDC Director Anne Schuchat said Feb. 15.
Speaking at a HHS briefing to announce the interim findings of flu vaccine effectiveness (and to tell everyone they should still get their flu shot if they haven't) Schuchat acknowledged that the flu season has been a difficult one, but "there’s no evidence of drift this year
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