Explore the recorded discovery and history of Human influenza viruses, with source links and stated limits.
This human-focused clinical group covers influenza illness rather than a single viral species. Symptoms often start suddenly. Influenza can cause mild or severe disease, and some people develop complications such as pneumonia.
The 1918 influenza pandemic preceded isolation of human influenza virus; its date is not a viral discovery date.
Smith, Andrewes and Laidlaw isolated influenza A virus, clarifying the viral cause of influenza.
The global influenza surveillance network began with 26 laboratories. Its start does not date influenza’s biological origin.
A new influenza A(H1N1) virus caused the 2009 pandemic. This clinical group also includes other influenza viruses.
A 1918 pandemic record and the 1933 virus isolation do not establish the first person ever infected with influenza. This profile groups several human influenza viruses.
Source check: 2026-09-19. Educational content; independent scientific review remains pending.