H1N1 er undirflokkur af inflúensu A og algengasta orsök inflúensu í fólki. Sum afbrigði af H1N1 sýkja menn svo sem afbrigðið sem olli spænsku veikinni árið 1918. Önnur afbrigði af H1N1 eru svínaflensa og fuglaflensa. Inflúensufaraldurinn árið 1918 dró 50-100 milljónir manns til dauða frá 1918-1919.

Í mars og apríl 2009 braust út svínaflensufaraldur í Mexíkó.

• Why Revive a Deadly Flu Virus? By Jamie Shreeve - January 2006 New York Times - Six-page human-interest story on the recreation of the deadly 1918 H1N1 flu virus
• BBC News - 1918 flu virus's secrets revealed Results from analyzing a recreated strain.
• Publicly available data
• Oral history by 1918 pandemic survivor
• Recent influenza A (H1N1) infections of pigs and turkeys in northern Europe
• Epidemiologic Notes and Reports Influenza A(H1N1) Associated With Mild Illness in a Nursing Home -- Maine
• Swine Influenza Vaccine, H1N1 & H3N2, Killed Virus Geymt 11 mars 2006 í Wayback Machine
• Influenza Virus Infections of Pigs Geymt 18 mars 2009 í Wayback Machine
• H1N1-influenza as Lazarus: Genomic resurrection from the tomb of an unknown

• BioHealthBase Bioinformatics Resource Center Database of influenza genomic sequences and related information.
• Outbreak Alerts United States based communicable disease notification website.

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