Influenza A virus subtype H1N1 is the most common cause of flu in humans.  Some strains of H1N1 are endemic in humans, including the strain responsible for the 1918 flu pandemic which killed 50–100 million people worldwide.  Other strains are endemic in pigs and in birds.
A new H1N1 virus strain is responsible for the outbreak first detected in Mexico in March 2009. It appears to be a reassortment of 4 strains, 1 endemic in humans, 1 in birds and 2 in pigs. Although called swine flu due to it predominantly containing swine strains, the World Organisation for Animal Health has proposed the name North American influenza because this new strain in its entirety has not been found in swine.  This strain was formally declared as a global flu pandemic by WHO after an emergency meeting on 11th June 2009.

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CDC: 2009 H1N1 Flu
Provides information in general and for specific groups, what to do to stay healthy, situation updates, vaccine status, and online resource material. From the Centers for Disease Control and Prevention.
WHO: Pandemic (H1N1) 2009
Provides news, FAQs, guidance documents, situation updates, regional information. From the World Health Organisation, Global Alert and Response (GAR).
Alltop: Top Swine Flu News
Swine flu news and headlines from around the web.
Australian Government Department of Health and Aging: Health Emergency
Information about pandemic(H1N1) influenza. Includes current status news, epidemiology, symptoms, prevention, and fact sheets.
BMJ: Pandemic Flu
British Medical Journal Group presents flu learning modules, news, blog, podcasts, and resources.
CIDRAP: Novel H1N1 Influenza (Swine Flu)
News, overview, selected reading list and resources, provided by The Center for Infectious Disease Research and Policy.
EBSCO Publishing: Influenza Portal
Information about the flu from EBSCO's evidence-based resources for physicians, nurses, and patients.
eMedicine: H1N1 Influenza (Swine Flu)
Article by Michael Stuart Bronze, MD with history, current outbreak information, symptoms, prevention, treatment, and testing.
eMedicinehealth: Novel H1N1 Influenza
Includes symptoms of the illness, infection treatment and prevention, vaccine history, test, slideshows, disease history, and doctor's perspective.
Europa: Pandemic (H1N1) 2009
Official European Union website provides news, statistics and graphs, documents, information and advice including antivirals and vaccines, and updates on what the European Commission is doing.
HealthMap: Track H1N1 (Swine Flu)
Tracking map of the latest alerts around the world and in the U.S.
Illinois Department of Health: H1N1 Flu
Provides newsroom, eduational resources, vaccination information, and statistics.
InFACT Global
Collaboration of clinicians and researchers working in intensive care units around the world. Aims to improve the care of patients with severe H1N1 infection through clinical research into its natural history and optimal treatment.
Kidshealth: H1N1 (Swine) Flu Center
Offers a series of articles about different aspects of the disease.
Mayo Clinic: H1N1 Flu
Overview covers swine flu symptoms, tests, treatment, risk factors, assessment of the pandemic, expert answers to questions, complications, and prevention.
MedicineNet: Swine Flu
Provides facts on swine flu (swine influenza A H1N1 virus) history, symptoms, how this contagious infection is transmitted, prevention with a vaccine, diagnosis, treatment, news and research.
MedlinePlus: Swine Flu
Provides information on this disease with news, facts and available treatments.
Medpage Today: Flu and URI
Infectious disease news from across the globe.
Merck Manual: H1N1 Swine Influenza
Fact sheet with cause, information about current outbreak, symptoms, diagnosis, treatment, and prevention.
Nature: Swine Flu
A series of news articles, features stories, research and forums from the medical and science magazine.
New England Journal of Medicine: H1N1 Influenza Center
Ongoing coverage from a medical perspective includes news, research, surveillance updates, policy, publications and background material.
New Zealand Ministry of Health: Influenza
Provides news, signs and symptoms, prevention, caring for others, and information for health professionals.
NHS Choices: Swine Flu (H1N1)
Provides information on this strain of influenza that caused a flu pandemic in 2009-2010. Includes details of symptoms, causes, treatment and pregnancy.
OFFLU: OIE/FAO Network of Expertise on Animal Influenza
Background information including FAQ, official statements, media releases, the disease situation and pandemic phases.
Pacific Public Health Surveillance Network: Influenza A H1N1
Includes surveillance data, advise, guidelines, posters, articles, and reports.
Pan American Health Organization: Swine Influenza
Portal providing links to information on the 2009 outbreak of this disease.
Public Health Agency of Canada: H1N1 Flu Virus
Presents fact sheets, FAQ, symptoms, prevention, vaccine information, facts for specific groups, provinces, and territories, webcasts, media room, and preparedness guide.
Rhiza Labs: FluTracker
Provides a world map showing reported cases, compiled using data from official sources, news reports and user-contributions.
Swine Flu in Italy
Blog about the spreading of the H1N1 virus, public feelings and the government's efforts. The sources are newspaper cuttings, press releases from the Italian Ministry of Health and reports from WHO, CDC and ECDC.
Texas Department of State Health Services: H1N1 Flu (Swine Flu)
Features investigations in the state, videos, press releases, and factsheets for the public and for professional health care workers.
U.S. National Library of Medicine: Enviro-Health Links 2009 H1N1 Flu (Swine Flu)
Provides information on federal and state responses, antiviral medication, vaccination, and guidance for professionals. Includes international resources and veterinary resources.
University of Iowa: Influenza A (H1N1) also Known as the Swine Flu
Extensive guide to web resources including latest news, maps, when to see a doctor, and educational resources for children. Provided by the University of Iowa Libraries.
ViralZone: H1N1 Subtype
Illustration of the virus and information on its molecular biology and replication.
WebMD: H1N1 Swine Flu Guide
Provides news, medical facts and practical advice.
Wikipedia: 2009 Flu Pandemic
Hyperlinked encyclopedia article about the global outbreak of the strain of influenza A virus subtype H1N1 identified in April 2009.
Wiley-Blackwell: Essential Resources on Influenza
Peer-reviewed articles from the company's publications on the prevention, diagnosis, treatment, and history of Influenza.

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June 25, 2018 at 1:45:47 UTC
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