Characteristics of Treponema pallidum, the bacterium which causes syphilis, include all except
A) vertical transmission to a fetus during any stage of pregnancy.
B) ability to avoid immune detection by varying the few antigens it carries on its surface.
C) not treatable with any of type antibiotic.
D) rapid invasion of host tissues from the initial infection site.
E) Gram-negative spirochete.
Answer: C
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