Treponema pallidum, a bacterium associated with syphilis, is not considered a pathogen because to date it remains unculturable in the lab, and, therefore, Koch's postulates are unable to be fulfilled.

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Quizplus · Accepted Answer

Treponema pallidum is considered a pathogen despite being unculturable in the laboratory. Koch's postulates have been met through various methods such as animal models and molecular techniques.

Treponema Pallidum, a Bacterium Associated with Syphilis, Is Not Considered