Flu activity is still elevated in the United States but is declining. It is possible, however, that flu activity will continue for several weeks in parts of the country.
While H3N2 viruses remain most common, an increase in influenza B viruses has been detected in some parts of the country. This season has been severe for people 65 years and older, with very high hospitalization rates being recorded.
Influenza antiviral drugs can treat flu illness. CDC recommends these drugs be used to treat people who are very sick or who are at high risk of serious flu-related complications who have flu symptoms. Early antiviral treatment works best.
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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.
H7N9: Human infections with a new avian influenza A (H7N9) virus were first reported in China in March 2013. CDC has been following this situation closely and is coordinating with domestic and international partners.
Influenza viruses that normally circulate in pigs are called “variant” viruses when they are found in people. Influenza A H3N2 variant viruses (also known as “H3N2v” viruses) with the matrix (M) gene from the 2009 H1N1 pandemic virus were first detected in people in July 2011.
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).
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.
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- Situation Update: Summary of Weekly FluView Friday, February 27, 2015
- FluView - Weekly Influenza Surveillance Report Friday, February 27, 2015
- NEW! Avian Flu Update: H5 Viruses Detected Among U.S. Domestic and Wild Birds Thursday, February 26, 2015
- ACIP reaffirms recommendation for annual influenza vaccination Thursday, February 26, 2015
- WHO Recommended composition of influenza virus vaccines for use in the 2015-2016 northern hemisphere Thursday, February 26, 2015
- Flu Antivirals Drugs continue to be Under-utilized in High-Risk Patients Thursday, February 26, 2015
- Page last reviewed: February 24, 2015
- Page last updated: February 24, 2015
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