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Review Question - QID 109196

Treponema pallidum / Syphilis Studies QID: 109196 (M1.MC.17.4798)
In scope icon M 2 C
QID 109196 (Type "109196" in App Search)
A 32-year-old man with no significant medical history presents to the emergency room with a painful lesion on his penis for the past week. He has recently been to Thailand and reports several encounters with a commercial sex worker. Physical exam reveals the finding shown in Figure A, as well as a painful palpable lymph node on the right side. His wife is concerned by these findings despite having no symptoms herself. They are both tested for sexually transmitted diseases with the following results:

Husband:
RPR: Negative
VDRL: Positive
FTA-ABS: Negative
Dark-field microscopy: No spirochetes

Wife:
RPR: Negative
VDRL: Negative
FTA-ABS: Positive
Dark-field microscopy: No spirochetes

Which of the following best explains the results?
  • A
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  • A