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.
UPDATE: 2009 H1N1 Flu International Situation Update
This report provides an update to the international situation as of January 31, 2010. The World Health Organization (WHO) continues to report updated 2009 H1N1 flu-associated laboratory-confirmed cases and deaths on its Web page.
UPDATE: Weekly FluView Map and Surveillance Report for Week Ending January 30, 2010
During week 4 (January 24-30, 2010), influenza activity remained at approximately the same levels as last week in the U.S.119 (3.2%) specimens tested by U.S. World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance System (NREVSS) collaborating laboratories and reported to CDC/Influenza Division were positive for influenza.
UPDATE: Influenza and Pneumonia-Associated Hospitalizations and Deaths from August 30, 2009 to January 30, 2010
FluView reports that for the week of January 24-30, 2010, flu activity in the United States remained about the same as during the previous week. Flu activity is relatively low at this time, with most flu continuing to be caused by 2009 H1N1. Flu activity, caused by either 2009 H1N1 or seasonal flu viruses, may rise and fall, but it is expected to continue for several more months.
NEW: Shortened Expiration Period For Sanofi Pasteur 2009 H1N1 Vaccine In Pre-filled Syringes Questions & Answers
All lots of monovalent 2009 H1N1 influenza vaccine in pre-filled syringes manufactured by Sanofi Pasteur, not included in the two earlier recalls, should now be administered by February 15, 2010 regardless of the expiration imprinted on the package.
NEW: Non-Safety-Related Voluntary Recall Of Sanofi Pasteur 2009 H1N1 Flu Vaccine In Pre-filled Syringes Questions and Answers
In recent testing of its influenza A (H1N1) monovalent vaccine, Sanofi Pasteur found five distributed lots of single-dose, pre-filled syringe pediatric (0.25 mL) vaccine and one distributed lot of single-dose pre-filled syringe for older children and adults (0.5 mL) vaccine had potency below pre-specified limits.
CDC Health Alert Network (HAN) Info Service Message: Non-Safety-Related Voluntary Recall of Unused Doses from Certain Lots of Sanofi Pasteur H1N1 Vaccine in Pre-Filled Syringes
As of January 7, 2010, the cumulative pro rata allocation is approximately 136 million doses of 2009 H1N1 vaccine. As of January 5, 2010, approximately 111 million doses have been shipped, so supplies of 2009 H1N1 vaccine available to be administered are ample. Although the 2009 H1N1 vaccine was initially prioritized to certain target groups, due to the increase in supply most jurisdictions are now making vaccine available for everyone who wishes to receive it.
UPDATE: Influenza and Pneumonia-Associated Hospitalizations and Deaths from August 30, 2009 to January 23, 2010
MMWR: Outbreaks of 2009 Pandemic Influenza A (H1N1) Among Long-Term--Care Facility Residents --- Three States, 2009
Morbidity and Mortality Weekly Report (MMWR) January 29, 2010 / 59(03);74-77
UPDATED: Key Facts About 2009 H1N1 Flu Vaccine
This document includes updated information about late season flu vaccination, including who is recommended, where to find vaccine, and why it should still be taken seriously.
UPDATED: Seasonal and 2009 H1N1 Flu Vaccines Questions and Answers for Businesses
This document includes updated information about late season flu vaccination, including who is recommended, where to find vaccine, and why it should still be taken seriously.

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