CDC has published the 2014-2015 recommendations for the prevention and control of influenza. CDC recommends an annual flu vaccine for everyone 6 months of age and older. Flu activity is low across the United States now, but usually begins to increase in October and most commonly peaks between January and March. Make plans to get your flu vaccine this fall.
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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 released Tuesday 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.
- Page last reviewed: October 1, 2014
- Page last updated: October 1, 2014
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