You know what it looks like… but what is it called?
TAKE THE QUIZ“Treponema pallidum”
We have one entry that includes the term Treponema pallidum.
Treponema pallidum immobilization test
noun: a serological test for syphilis in which a solution containing the living causative spirochete (Treponema pallidum) is combined with serum in the presence of complement with immobilization of the active spirochetes indicating a positive result —abbreviation TPI
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Merriam-Webster unabridged