Percentage of Visits for Influenza-like Illness (ILI) Reported by the U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet), National Summary 2008-2009 and Previous Two Seasons
This graph indicates that there have been a lot of visits to health services for flu like symptoms this year, but the frequency is trailing off. The lab confirmed flu viruses this year have been largely confined to H1N1.
If you look at the following graph you will see that the seasonal flu seems usually to peak in the United States in January or February, so we may see an unusual second flu peak this winter, with one of the new H1N1 flu and the other of a more conventional seasonal flu.
Note too, however, that it is possible to see an antigenic shift in the H1N1 flu with a more severe epidemic in the future.
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