CDC Update: Influenza Activity
The emergence and spread of 2009 pandemic influenza A (H1N1) virus resulted in substantial influenza activity in the United States throughout the summer and fall months of 2009, with activity peaking in late October. Activity declined beginning in November 2009 (1) but continued at lower levels through March 2010. The 2009 H1N1 virus remained the dominant circulating influenza virus throughout the season; <1% of characterized viruses were seasonal influenza A (H1), A (H3), and influenza B viruses.
The report continued:
Vaccination with 2009 H1N1 vaccine remains the key strategy for prevention of 2009 H1N1 influenza infection (2). Although national influenza activity has decreased substantially since peak activity in October 2009, the persistence of sustained transmission in some areas (resulting in additional cases, hospitalizations, and deaths) emphasizes the importance of a continued focus on vaccination of initial target groups as well as the rest of the susceptible population.
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