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Difficulty: HardPediatric Infectious Diseases

Match each pediatric patient's clinical presentation with the most appropriate empiric or targeted first-line pharmacological therapy.

  • Evaluation of a 12-day-old neonate reveals grouped vesicular lesions on the scalp, accompanied by progressive lethargy and a recent focal seizure.Intravenous acyclovir
  • During a clinic visit, a 3-week-old infant exhibits episodes of severe paroxysmal coughing followed by perioral cyanosis and post-tussive emesis.Oral azithromycin
  • A 6-year-old girl with a history of sickle cell anemia is admitted for acute, severe pain and palpable swelling over the right distal femur, alongside a temperature of 39.4°C.Intravenous ceftriaxone and vancomycin
  • Following a camping trip in Massachusetts two weeks prior, a 4-year-old boy develops a 10-cm expanding annular erythematous patch with central clearing on his back.Oral amoxicillin
  • Emergency medical services bring in a 2-year-old unimmunized boy experiencing acute high fever, profound dysphagia, drooling, and a preference for sitting leaning forward.Intravenous ceftriaxone

Answer

The correct matches pair each specific pediatric clinical syndrome with its ideal targeted antimicrobial therapy: the neonate with HSV requires IV acyclovir; the infant with pertussis requires oral azithromycin; the sickle cell patient with osteomyelitis requires IV ceftriaxone and vancomycin; the young child with early Lyme disease requires oral amoxicillin; and the unimmunized child with epiglottitis requires IV ceftriaxone.
Each specific clinical vignette in this matching set describes a classic pediatric infectious disease scenario that demands a highly specific antimicrobial regimen based on strict clinical guidelines. The correct pairings align the presumed etiology (HSV, Pertussis, Salmonella/S. aureus, Borrelia, H. influenzae) with the safest, most effective pharmacological intervention for the child's exact age and underlying health status.

Step-by-Step Solution

1
Analyze the presentation of the 12-day-old neonate with vesicular lesions and seizures.
The clinical picture is pathognomonic for neonatal HSV with central nervous system involvement.
Recognizing neonatal HSV is critical because it requires immediate, empiric intravenous acyclovir to prevent severe neurological morbidity or mortality.
2
Evaluate the 3-week-old infant exhibiting paroxysmal coughing and cyanosis.
The symptoms align with Bordetella pertussis infection.
While macrolides are the treatment of choice, azithromycin must be specifically selected over erythromycin for infants under 1 month to mitigate the risk of infantile hypertrophic pyloric stenosis.
3
Assess the 6-year-old girl with sickle cell anemia and focal bone pain/fever.
The diagnosis is acute osteomyelitis, which in sickle cell patients is most frequently caused by Salmonella spp. and Staphylococcus aureus.
Empiric therapy must provide dual coverage; thus, combining intravenous ceftriaxone (for Salmonella) and vancomycin (for MRSA) is the optimal strategy.
4
Identify the etiology of the expanding annular rash in the 4-year-old boy.
Erythema migrans confirms early localized Lyme disease.
In children younger than 8 years old, oral amoxicillin is the traditional, preferred first-line therapy over prolonged doxycycline to treat early localized disease.
5
Diagnose the unimmunized 2-year-old in respiratory distress with drooling.
The 'tripod' positioning and acute dysphagia point to epiglottitis (Haemophilus influenzae type b).
Alongside securing the airway, prompt administration of an intravenous third-generation cephalosporin (like ceftriaxone) is required to eradicate the pathogen.

Key Concept

Empiric antimicrobial selection in pediatric infectious diseases requires precise tailoring based on the patient's age, specific clinical syndrome, immunization status, and underlying genetic risk factors (e.g., sickle cell disease).
Estimated Time:2m 0s
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Topics

Pediatric Infectious Diseases

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