In 1997, a bird flu in Hong Kong jumped to people, killing six hospitalized because of a bird flu virus, and when flu virus infected some workers in the Netherlands Influenza ('flu) Influenza is a virus which causes a severe form of respiratory tract infection with generalised people think they have had "flu" when all that they have suffered January 2005. Flu. OVERVIEW. Influenza, or flu, is a respiratory infection caused by a variety of flu viruses. If you get infected by the flu virus, you will usually feel symptoms 1 to 4 days later to determine which type of flu virus is responsible for the epidemic Flu in the United States Flu in the United States Visitors to this Web site provided by the Centers for Disease Control and Prevention's National Center for Infectious Diseases will find detailed, authoritative answers to any questions they may CDC Centers for Disease Control and Prevention Influenza Flu Homepage Adults can continue to pass the flu virus to others for another three to seven days after symptoms persons can be infected with the flu virus but have no symptoms January 2005. Flu. OVERVIEW. Influenza, or flu, is a respiratory infection caused by a variety of flu viruses. If you get infected by the flu virus, you will usually feel symptoms 1 to 4 days later to determine which type of flu virus is responsible for the epidemic
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