For each of the following pediatric clinical vignettes describing a characteristic infectious exanthem or dermatologic manifestation, identify the most likely causative pathogen and the most appropriate next step in management.
- A 6-year-old boy from the southeastern United States presents with a 4-day history of headache and vomiting. Temperature is 39.4°C (102.9°F), heart rate is 120/min, and blood pressure is 95/60 mmHg. Examination reveals a discrete, blanching maculopapular rash that is becoming petechial on his palms, soles, wrists, and ankles. Laboratory testing shows a platelet count of 90,000/mm³.Rickettsia rickettsii; initiate empiric doxycycline immediately (drug of choice regardless of age)
- A 5-year-old girl with a history of chronic, severely pruritic flexural plaques presents with a temperature of 38.8°C (101.8°F). Examination reveals a rapidly spreading eruption of monomorphic, punched-out erosions with overlying hemorrhagic crusts on her face and neck. Prominent submandibular lymphadenopathy is present.Herpes simplex virus; initiate systemic acyclovir immediately to prevent life-threatening dissemination
- A 3-year-old girl develops acute irritability and diffuse cutaneous erythema, most pronounced in the flexural creases. Temperature is 39.0°C (102.2°F). Gentle stroking of her perioral skin causes the superficial epidermal layer to shear off easily, leaving a moist, denuded base. Leukocyte count is 18,000/mm³.Staphylococcus aureus; initiate intravenous antistaphylococcal antibiotics and fluid management
- A 7-year-old boy presents with fatigue and migrating joint pain. Vitals are within normal limits for age. Examination reveals three expanding, erythematous annular plaques with central clearing scattered across his back and thighs. He also exhibits new-onset unilateral facial nerve palsy.Borrelia burgdorferi; initiate oral amoxicillin, doxycycline, or cefuroxime
Answer
The correct pairings accurately match Rocky Mountain Spotted Fever with Rickettsia rickettsii (doxycycline), Eczema herpeticum with Herpes simplex virus (acyclovir), Staphylococcal Scalded Skin Syndrome with Staphylococcus aureus (antistaphylococcal antibiotics), and early disseminated Lyme disease with Borrelia burgdorferi (oral antibiotics).
Each clinical scenario presents pathognomonic features of a specific pediatric infectious disease. The pairings correctly associate these presentations with their definitive microbiological etiology and evidence-based first-line treatment protocols.
Step-by-Step Solution
Key Concept
Recognition and appropriate pathogen-specific management of critical pediatric infectious exanthems.
Estimated Time:2m 0s