U.S. Surveillance on H1N1
U.S. Surveillance on H1N1

September 02, 2009 Tags:

The unusually high percentage of specimens testing positive for influenza by WHO and NREVSS collaborating laboratories remained higher during week 33 than is typically seen this time of year, and may be due to a combination of factors including higher than normal circulation of influenza in the summer with the emergenc
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