Key Points

  • The 2019-2020 season is underway; all regions of the country are seeing elevated levels of flu-like illness.
  • Activity is being caused mostly by influenza B/Victoria viruses, which is unusual for this time of year.  A/H1N1 viruses are the next most common and are increasing in proportion relative to other influenza viruses in some regions.
  • CDC estimates that so far this season there have been at least 2.6 million flu illnesses, 23,000 hospitalizations and 1,300 deaths from flu.
  • It’s not too late to get vaccinated.  Flu vaccination is always the best way to prevent flu and its potentially serious complications.
  • Antiviral medications are an important adjunct to flu vaccine in the control of influenza.  Almost all (>99%) of the influenza viruses tested this season are susceptible to the 4 FDA-approved influenza antiviral medications recommended for use in the U.S. this season.



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