Mastering Medical
USMLE Step 1 · Infectious Disease

Early syphilis vs Latent, tertiary, and congenital syphilis

How to tell Early syphilis and Latent, tertiary, and congenital syphilis apart when a board question makes them look alike.

Fastest separator

Primary = chancre; secondary = systemic rash/mucous lesions; latent = serology only; tertiary = gummas/aorta/neuro; congenital = transplacental infant findings.

Side by side

Early syphilisLatent, tertiary, and congenital syphilis
Key clue

Primary syphilis causes painless chancre and regional lymphadenopathy; secondary syphilis causes diffuse rash including palms/soles, mucous patches, condyloma lata, fever, and generalized lymphadenopathy.

Latent syphilis is seroreactivity without symptoms; tertiary syphilis causes gummas, aortitis, or neurosyphilis; congenital syphilis causes snuffles, rash, hepatosplenomegaly, or late teeth/bone/neuro findings.

Mechanism

Treponema pallidum spreads locally then hematogenously, producing highly infectious early lesions.

Untreated infection can enter asymptomatic latency and later cause inflammatory destruction; transplacental spread causes congenital disease.

Labs and tests

Painless chancre, condyloma lata, mucous patches, palms/soles rash, RPR/VDRL screening, and treponemal confirmation support early syphilis.

Positive serology without symptoms supports latent disease; aortitis, tabes/general paresis, gummas, or congenital stigmata support late/congenital disease.

The trap

Rash on palms and soles is secondary syphilis, not tertiary disease; latent disease has no symptoms.

The repair move

For syphilis, stage by lesion pattern and symptoms before choosing treatment duration.

Try a free question

Core

A patient has a painless genital ulcer with clean base and nontender regional lymphadenopathy. Which stage is most likely?

Show answer and explanation

Answer: A. Primary syphilis. A painless chancre with regional lymphadenopathy supports primary syphilis.

Why the other choices are tempting

  • B. Secondary syphilis causes systemic rash, mucous patches, and condyloma lata.
  • C. Latent syphilis is seroreactivity without symptoms.
  • D. Tertiary syphilis causes gummas, aortitis, or neurosyphilis.
  • E. Congenital syphilis follows transplacental infection.

Flashcards

Tap a card to flip it.

What lesion supports primary syphilis?

A painless chancre supports primary syphilis.

What rash supports secondary syphilis?

A diffuse rash involving palms and soles supports secondary syphilis.

Quick answers

What is the fastest way to tell Early syphilis from Latent, tertiary, and congenital syphilis?

Primary = chancre; secondary = systemic rash/mucous lesions; latent = serology only; tertiary = gummas/aorta/neuro; congenital = transplacental infant findings.

What is the key clue for Early syphilis?

Primary syphilis causes painless chancre and regional lymphadenopathy; secondary syphilis causes diffuse rash including palms/soles, mucous patches, condyloma lata, fever, and generalized lymphadenopathy.

What is the key clue for Latent, tertiary, and congenital syphilis?

Latent syphilis is seroreactivity without symptoms; tertiary syphilis causes gummas, aortitis, or neurosyphilis; congenital syphilis causes snuffles, rash, hepatosplenomegaly, or late teeth/bone/neuro findings.

What is the common trap with Early syphilis vs Latent, tertiary, and congenital syphilis?

Rash on palms and soles is secondary syphilis, not tertiary disease; latent disease has no symptoms.