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im_thatoneguy t1_jdk1ror wrote

Reply to comment by yofomojojo in What happened to the old COVID variants, like Delta? Could they come back? by number1dork

https://pubag.nal.usda.gov/download/26795/PDF

That radiolab is discussing the basis of a 2005 paper which included the entire genome. So a 2009 CDC analysis (which NPR cites) should be based on the fully sequenced H1N1-1918 genome from 2005.

Edit:

https://www.pnas.org/doi/10.1073/pnas.1324197111#supplementary-materials

This states that H1N1 didn't go away, it continued to evolve into a seasonal H1N1. And that likely the 1918 H1N1 branched off into the H1N1 in pigs prior to the human outbreak.

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