CDC published "Update: Influenza Activitiy - United States, October 3-December 11, 2010" in the December 24, 2010 issue of MMWR.

 During October 3-December 11, 2010, influenza activity remained low in most regions of the United States. Influenza viruses characterized thus far in the influenza season are well matched to the strains included in the 2010-11 influenza vaccine. This report summarizes US influenza activity during this period.

Editorial Note

Influenza activity in the United States during October 3-December 11 was low overall, with co-circulation of influenza A (H3N2), 2009 A (H1N1), and B viruses. Regional differences in influenza activity have been noted, with the highest levels seen in the southeastern states, where influenza B viruses have predominated. Influenza activity likely will continue to increase in the weeks ahead. During the 2009-10 season, as a result of pandemic 2009 influenza A (H1N1) circulation, influenza activity peaked unusually early (late October); however, during 22 of the 27 influenza seasons before the 2009-10 season, influenza activity peaked in January or later. Healthcare providers should offer influenza vaccination thoughout the influenza season to protect as many persons as possible from influenza virus infection and its complications.

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