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Difficulty: HardPediatric Infectious Diseases

An 8-week-old boy is brought to the pediatric clinic by his mother due to a 3-week history of severe nasal congestion and a skin rash. The mother reports that the infant has a thick, blood-tinged nasal discharge that frequently interferes with his ability to feed. A few days ago, a red, peeling rash appeared on the infant's extremities, distinctly involving the palms and soles. The infant was born at home in a rural setting, and the mother did not receive any formal prenatal care. On physical examination, the infant's temperature is 37.5°C (99.5°F), pulse is 145/min, and respirations are 38/min. The infant appears mildly fussy but easily consolable. Generalized lymphadenopathy and firm hepatosplenomegaly are palpable. The lungs are clear to auscultation bilaterally. Which of the following is the most appropriate next step in the management of this patient?

  1. A
    Intravenous ceftriaxone and vancomycin
  2. B
    Oral erythromycin and close outpatient follow-up
  3. C
    Nebulized albuterol and oral dexamethasone
  4. Intravenous aqueous crystalline penicillin GAnswer
  5. E
    Administration of the live-attenuated measles, mumps, and rubella vaccine

Answer

Intravenous aqueous crystalline penicillin G
The correct approach is to initiate intravenous aqueous crystalline penicillin G. This infant's presentation is pathognomonic for early congenital syphilis. Infants born to mothers without prenatal care are at high risk for congenital infections (ToRCHeS). Early congenital syphilis classically presents in the first 1-2 months of life with:

1. 'Snuffles': A copious, often blood-tinged, mucopurulent rhinitis.
2. Rash: A maculopapular or vesicular rash that typically involves the palms and soles and eventually desquamates.
3. Organomegaly: Hepatosplenomegaly and generalized lymphadenopathy.

Once congenital syphilis is strongly suspected, the definitive treatment is a 10-day course of intravenous aqueous crystalline penicillin G.

### Classic Congenital Infections Comparison
InfectionClassic Clinical FindingsDefinitive Treatment
SyphilisSnuffles, palmar/plantar desquamating rash, hepatosplenomegalyIV Penicillin G
CMVPeriventricular calcifications, microcephaly, sensorineural hearing lossGanciclovir/Valganciclovir
ToxoplasmosisDiffuse intracerebral calcifications, chorioretinitis, hydrocephalusPyrimethamine, Sulfadiazine, Folinic acid
RubellaCataracts, sensorineural hearing loss, PDA, blueberry muffin rashSupportive care

Step-by-Step Solution

1
Analyze the patient's demographic risk factors and vital signs.
The patient is an 8-week-old infant born to a mother with no prenatal care, which represents a major risk factor for vertically transmitted (congenital) infections.
Lack of maternal screening for syphilis, HIV, Hepatitis B, and Rubella significantly increases the risk of unrecognized congenital disease.
2
Evaluate the classic triad of clinical findings.
The infant presents with severe rhinitis ('snuffles'), a desquamating maculopapular rash prominently involving the palms and soles, and generalized hepatosplenomegaly and lymphadenopathy.
These specific physical exam findings strongly point toward early congenital syphilis, which typically manifests within the first 5 to 8 weeks of life.
3
Determine the most appropriate definitive management.
The standard of care for symptomatic early congenital syphilis is an inpatient 10-day course of intravenous aqueous crystalline penicillin G.
Penicillin G is the only antimicrobial agent with documented efficacy for treating central nervous system and systemic involvement of congenital Treponema pallidum infection.

Key Concept

Early congenital syphilis typically presents in the first few weeks of life with copious nasal discharge ('snuffles'), a maculopapular or vesicular rash that eventually desquamates (characteristically involving the palms and soles), and hepatosplenomegaly. The definitive treatment of choice is 10 days of intravenous aqueous crystalline penicillin G.
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Pediatric Infectious Diseases

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