treponema
noun
any of several anaerobic spirochetes of the genus Treponema, certain species of which are parasitic in and pathogenic for humans and warm-blooded animals.
The grammatical form denoting more than one person, place, thing, or idea.
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Against that grim list, the sole crowd infectious diseases that can be attributed with certainty to pre-Columbian Native American societies were nonsyphilitic treponemas.
From "Guns, Germs, and Steel: The Fates of Human Societies" by Jared M. Diamond
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