Influenza A virus subtype H2N2

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What Wikipedia says

Influenza A virus subtype H2N2 (A/H2N2) is a subtype of Influenza A virus. H2N2 has mutated into various strains including the "Asian flu" strain (now extinct in the wild), H3N2, and various strains found in birds. It is also suspected of causing a human pandemic in 1889.

Excerpt from the Wikipedia article “Influenza A virus subtype H2N2”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Zeichner: M. Eickmann, Public domain, via Wikimedia Commons.