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Difficulty: MediumPediatric Infectious Diseases

During a prompt visit to the pediatric emergency department, the parents of a 16-day-old boy report that he developed a fever earlier in the day. A rectal thermometer reading at home was 38.6°C (101.5°F). Upon arrival, the infant's vital signs include a temperature of 38.4°C (101.1°F), heart rate of 158/min, and respiratory rate of 48/min. The parents also mention a rash that appeared on his trunk yesterday, described as blotchy and red with small, pale papules in the center. He has a mild, occasional cough but is breastfeeding vigorously and producing adequate wet diapers. The infant was born at 39 weeks of gestation via an uncomplicated spontaneous vaginal delivery. Maternal group B Streptococcus screening was negative. Physical examination reveals the described rash over the chest and abdomen; a microscopic smear of a papule demonstrates numerous eosinophils. His lungs are clear to auscultation, and the remainder of the examination is unremarkable. Which of the following is the most appropriate next step in management?

  1. Admit to the hospital, obtain blood, urine, and cerebrospinal fluid cultures, and initiate intravenous ampicillin and gentamicinAnswer
  2. B
    Reassure the parents about the benign nature of the rash and discharge home with instructions for supportive care
  3. C
    Obtain blood and urine cultures, administer intramuscular ceftriaxone, and arrange for follow-up in 24 hours
  4. D
    Administer nebulized albuterol and prescribe a course of oral azithromycin
  5. E
    Administer the first dose of the rotavirus vaccine and discharge home with antipyretics

Answer

Admit to the hospital, obtain blood, urine, and cerebrospinal fluid cultures, and initiate intravenous ampicillin and gentamicin.
The correct answer outlines the gold standard management for a febrile neonate (under 28 days of age). Due to their immature immune systems, neonates with a fever (temperature ≥ 38.0°C or 100.4°F) have a high risk of serious bacterial infections (SBIs), including bacteremia, urinary tract infections, and meningitis. Regardless of how well the infant appears or the presence of concurrent benign conditions (like erythema toxicum neonatorum, which is characterized by eosinophil-filled pustules), a full sepsis workup is absolutely mandatory. This includes obtaining blood, urine, and cerebrospinal fluid (CSF) cultures, followed immediately by admission and empiric intravenous antibiotics. The standard empiric regimen is ampicillin (to cover Listeria and Group B Streptococcus) and gentamicin or cefotaxime (to cover gram-negative organisms like E. coli).

Step-by-Step Solution

1
Analyze the patient's age and vital signs.
The patient is a 16-day-old neonate with a documented fever of 38.6°C (101.5°F) at home and 38.4°C (101.1°F) in the ED.
Any fever (≥ 38.0°C or 100.4°F) in an infant younger than 28 days is considered a medical emergency due to their immature immune system.
2
Evaluate the secondary findings (rash and cough).
The rash with eosinophils is diagnosed as erythema toxicum neonatorum (a benign condition). The cough is mild and the lungs are clear.
Secondary benign findings must not distract from the primary critical protocol for a febrile neonate.
3
Determine the required diagnostic and therapeutic interventions.
A full sepsis workup (blood, urine, and CSF cultures) followed by empiric intravenous antibiotics is mandatory.
Neonates are at high risk for invasive bacterial infections from pathogens such as Group B Streptococcus, E. coli, and Listeria monocytogenes. Ampicillin and gentamicin (or cefotaxime) provide the necessary empiric coverage.

Key Concept

Neonatal Fever and Sepsis Workup Protocol
Estimated Time:1m 30s
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Topics

Pediatric Infectious Diseases

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