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Difficulty: MediumPediatric Infectious Diseases

A 14-day-old male infant is brought to the pediatric emergency department by his parents due to irritability, poor feeding, and a new rash that appeared 12 hours ago. He was born at 39 weeks gestation via spontaneous vaginal delivery. Membranes ruptured 18 hours prior to delivery, and a fetal scalp electrode was used during labor. The mother received standard prenatal care. His temperature is 38.3°C (100.9°F), heart rate is 168/min, and respiratory rate is 48/min. The infant appears lethargic but is arousable. Skin examination reveals a localized cluster of 2-mm fluid-filled vesicles on an erythematous base situated on the right temporal scalp. Lung auscultation reveals mild, scattered expiratory wheezing bilaterally. Which of the following is the most appropriate next step in management?

  1. A
    Reassure the parents that the skin findings are benign and discharge the patient with routine follow-up
  2. B
    Administer nebulized albuterol and oral corticosteroids to manage the observed expiratory wheezing
  3. Perform a comprehensive sepsis evaluation and initiate intravenous acyclovir, ampicillin, and cefotaximeAnswer
  4. D
    Perform a comprehensive sepsis evaluation and initiate empirical therapy with only intravenous ampicillin and cefotaxime
  5. E
    Administer varicella-zoster immune globulin and the live-attenuated varicella vaccine

Answer

The correct approach is to perform a comprehensive sepsis evaluation and initiate intravenous acyclovir, ampicillin, and cefotaxime.
The correct management is a comprehensive sepsis evaluation (blood, urine, and cerebrospinal fluid testing) accompanied by empirical intravenous acyclovir, ampicillin, and cefotaxime. This 14-day-old neonate presents with fever, lethargy, and clustered vesicles on the scalp at the site of a fetal scalp electrode. This presentation is a classic textbook description of neonatal herpes simplex virus (HSV) infection, specifically localized skin-eye-mouth (SEM) disease, which can rapidly progress to central nervous system or disseminated disease. Immediate administration of intravenous acyclovir is critical for reducing morbidity and mortality. Because clinical presentation alone cannot reliably differentiate viral from bacterial sepsis in a neonate, empirical broad-spectrum antibiotics (ampicillin and cefotaxime) must also be initiated pending culture results.

Step-by-Step Solution

1
Analyze the patient's vital signs and physical examination findings.
The 14-day-old infant is febrile (38.3°C), lethargic, and has a cluster of vesicles on an erythematous base on the scalp.
Identifying systemic instability and pathognomonic skin lesions helps narrow down the differential diagnosis from benign rashes to serious infectious etiologies.
2
Correlate the physical findings with the birth history.
The vesicles are located precisely where a fetal scalp electrode was placed, strongly suggesting localized inoculation of Herpes Simplex Virus (HSV) during labor.
Scalp monitors create microtrauma that can serve as a portal of entry for maternal genital HSV, leading to localized skin-eye-mouth (SEM) or systemic neonatal HSV disease.
3
Determine the appropriate empirical management for a neonate with suspected HSV.
The infant requires an immediate full sepsis evaluation (including lumbar puncture for HSV PCR and bacterial cultures) followed by broad-spectrum antibiotics and intravenous acyclovir.
Neonatal HSV can rapidly progress to devastating central nervous system disease or disseminated infection. Empirical antiviral therapy is life-saving, and concurrent antibiotics are required to cover for potential co-existing bacterial sepsis until cultures result.

Key Concept

Management of Neonatal Herpes Simplex Virus (HSV)
Estimated Time:1m 15s
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Topics

Pediatric Infectious Diseases

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