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The 2016-2017 influenza season has peaked and flu activity is low in the United States. A summary of flu activity and flu vaccine effectiveness during 2016-2017 is available in the MMWR.

All 2016-2017 flu vaccine will be expired by June 30, 2017. Vaccine for the 2017-2018 flu season is being produced and will be available in late summer and fall. CDC recommends everyone 6 months and older get a yearly flu vaccine by the end of October, if possible.

Flu viruses circulate at low levels during summer. CDC recommends prompt treatment with influenza antiviral drugs for people who are very sick with flu and people who are at high risk of flu complications 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.

Avian influenza A viruses usually do not infect humans, but rare cases of human infection with these viruses have been reported. Most of the time, these rare infections have occurred after unprotected contact with infected birds or surfaces contaminated with avian influenza viruses.

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There are many different influenza A viruses; some are found in humans and others in animals such as swine flu in pigs.

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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.

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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.

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Dog flu is a contagious respiratory disease in dogs caused by a specific Type A influenza virus referred to as a “canine influenza virus.” This is a disease of dogs, not of humans.

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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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Flu Activity & Surveillance



International Flu

Fiscal Years 2014 and 2015, Annual Report, Influenza Division International Activities 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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