That's got to be one of the greatest legacies in all human history. No politician or other empire-builder comes close.
I think https://en.wikipedia.org/wiki/Louis_Pasteur wins this one, though.
Norman Borlaug probably comes close. H. Trendley Dean was also impactful on a large scale, while its seemingly less important it helps a lot of people.
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And it comes at a time when a disease we were working on eliminating, measles, has come back and the US is about to lose its measles-free status.
It sounds as if his legacy is to be unique, a feat never to be accomplished again.