Influenza activity is still rising in the U.S. and is expected to continue for several weeks.
CDC recommends a yearly flu vaccine for everyone 6 months and older. This season's flu vaccines are reducing risk of illness by nearly half. Anyone who had not yet gotten vaccinated this season, should do it now.
CDC also recommends prompt treatment with influenza antiviral drugs for people who are very sick with flu or people who are at high risk of flu illness who get flu.
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There are many different influenza A viruses; some are found in humans and others in animals such as avian flu in birds and poultry.
U.S. H5 Viruses: Highly pathogenic avian influenza (HPAI) H5 infections have been reported in U.S. birds and poultry. No human infections with these viruses have been detected at this time, however similar viruses have infected people in other countries and caused serious illness and death in some cases.
CDC’s pandemic preparedness efforts include ongoing surveillance of human and animal influenza viruses, risk assessments of influenza viruses with pandemic potential, and the development and improvement of preparedness tools that can aid public health practitioners in the event of an influenza pandemic.
Bat influenza refers to influenza A viruses found in bats. Laboratory research at CDC suggests these viruses would need to undergo significant changes to become capable of infecting and spreading easily among humans. Little yellow shouldered bats are not native to the continental United States, but are common in Central and South America.
Influenza A viruses are found in humans and many different animals, including ducks, chickens, pigs, whales, horses and seals. Additional information on 2009 H1N1 influenza, Flu.gov, and Nonpharmaceutical Interventions (NPIs).
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The latest report on CDC's international flu activities highlights the progress that has been made over the past two fiscal years in establishing, expanding and maintaining influenza surveillance and laboratory capacity in more than 50 countries around the world where CDC has provided support.
- FluView - Weekly Influenza Surveillance Report Friday, February 17, 2017
- Update: Influenza Activity — United States, October 2, 2016–February 4, 2017 Friday, February 17, 2017
- Interim Estimates of 2016–17 Seasonal Influenza Vaccine Effectiveness — United States, February 2017 Friday, February 17, 2017
- CDC Reports This Season’s Flu Vaccine Reducing Risk by Nearly Half Thursday, February 16, 2017
- Summary of Influenza Risk Assessment Tool (IRAT) Results Thursday, February 16, 2017
- Page last reviewed: February 17, 2017
- Page last updated: February 17, 2017
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- Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases (NCIRD)
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