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BIO NMDCAT Sexually transmitted diseases
nmdcat.online July 16, 2026

Concerning the natural progression of syphilis, if the primary chancre heals completely without medical treatment, the most appropriate clinical interpretation is that:

A. The patient's immune system has cleared the infection entirely.
B. The bacteria have entered the bloodstream, initiating the secondary stage.
✓
C. The patient has developed lifelong immunity against reinfection.
D. The disease has directly progressed to neurosyphilis.

📝 Explanation

The correct option is The bacteria have entered the bloodstream, initiating the secondary stage. The primary chancre heals spontaneously after 3-6 weeks, even without treatment. This does not mean a cure; rather, the spirochetes disseminate systemically, leading to secondary syphilis.

📖 Additional Information

  • The patient's immune system has cleared the infection entirely.
  • The bacteria have entered the bloodstream, initiating the secondary stage.
  • The patient has developed lifelong immunity against reinfection.
  • The disease has directly progressed to neurosyphilis.

The correct option is The bacteria have entered the bloodstream, initiating the secondary stage. The primary chancre heals spontaneously after 3-6 weeks, even without treatment. This does not mean a cure; rather, the spirochetes disseminate systemically, leading to secondary syphilis.

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