What is H1N1?



Novel H1N1 flu, popularly known as swine flu, is a respiratory infection caused by an influenza virus first recognized in spring 2009. The new virus, which is officially called swine influenza A (H1N1), contains genetic material from human, swine and avian flu viruses.

Technically, the term "swine flu" refers to influenza in pigs. Occasionally, pigs transmit influenza viruses to people, mainly hog farm workers and veterinarians. Less often, someone infected occupationally passes the infection to others. You can't catch swine flu from eating pork.

Unlike typical swine flu, H1N1 flu spreads quickly and easily. In June 2009, when the infection's spread had been verified worldwide, the World Health Organization declared H1N1 flu a global pandemic.

An H1N1 vaccine has been developed for the 2009-10 flu season.
2009 H1N1 Flu: International Situation Update
This report provides an update to the international situation as of November 20, 2009. The World Health Organization (WHO) continues to report updated 2009 H1N1 flu-associated laboratory-confirmed cases and deaths on its Web page.
Weekly FluView Map and Surveillance Report for Week Ending November 14, 2009
During the week of November 8-14, 2009, influenza activity remained high in the United States as reported in FluView. Flu activity is widespread in 48 states. Nationally, visits to doctors for influenza-like-illness declined slightly from last week, but are still very high. Flu-related hospitalizations and deaths continue to increase and are very high nation-wide compared to what is expected for this time of year.
NEW: Vaccine Information for Clinicians and Health Care Professionals - Vaccine Dosage, Administration, and Storage
These tables for healthcare providers and planners provide information related to spacing between the two doses of 2009 H1N1 Vaccine for children 6 months through 9 years of age and for administration of 2009 H1N1 Vaccine with seasonal influenza and other vaccines.
NEW: Information for Vaccine Planners - Supply and Distribution
These tables for healthcare providers and planners provide information related to spacing between the two doses of 2009 H1N1 Vaccine for children 6 months through 9 years of age and for administration of 2009 H1N1 Vaccine with seasonal influenza and other vaccines.
New: Graphical Representations of a Generic Influenza Virus
These pictures provide a 3D graphical representation of the biology and structure of a generic influenza virus, and are not specific to the 2009 H1N1 virus.
U.S. Influenza and Pneumonia-Associated Hospitalizations and Deaths from August 30 to November 14, 2009
During the week of November 8-14, 2009, influenza activity decreased slightly in the United States as reported in FluView. Flu activity is widespread in 43 states. Nationally, visits to doctors for influenza-like-illness declined from last week, but are still higher than expected for this time of year. Flu-related hospitalizations and deaths have declined slightly, but are still very high nation-wide compared to what is expected for this time of year.
New: Updated Guidance for the Use of CSL 2009 H1N1 Monovalent Vaccine
On November 11, 2009, the FDA expanded the approved use of CSL's seasonal and 2009 H1N1 monovalent influenza vaccines to include children aged 6 months and older. Both vaccines had previously been approved only for use in adults, aged 18 years and older.
New: Questions and Answers: 2009 H1N1 and Pneumococcal Disease in the News
What is invasive pneumococcal disease? What does CDC know about invasive pneumococcal disease among people who get 2009 H1N1 or seasonal influenza? What is Active Bacterial Core surveillance (ABCs)?
New: 2009 H1N1 Flu Information for People with Disabilities and Their Caregivers or Personal Assistants
People with certain types of disability have a higher risk of getting flu-related complications, such as pneumonia. The 2009 H1N1 Flu Information for People with Disabilities and Their Caregivers or Personal Assistants is now available to the public.
Update: FDA Questions and Answers for Health Care Providers: Renal Dosing and Administration Recommendations for Peramivir IV
Questions and answers for renal dosing and administration for peramivir IV.

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