Early-Onset GBS Disease in Newborns

Clinical Presentation and Diagnosis

Approximately 90% of early-onset GBS disease manifests within the first 24 hours of life, presenting primarily as sepsis and pneumonia, regardless of whether the mother received intrapartum antibiotics, according to the Centers for Disease Control and Prevention (CDC) 1, 2
The American Academy of Pediatrics recommends that clinicians be aware that early manifestation is the rule, with symptoms appearing rapidly after birth, and that the vast majority of infected infants will show signs of illness within the first day of life 3, 4
Fever or temperature instability, such as fever or hypothermia, is a common sign of sepsis in newborns, as noted by the CDC 1
Respiratory distress, including tachypnea, grunting, nasal flaring, retractions, or apnea, is a key indicator of pneumonia in newborns with GBS disease, according to the CDC 1, 2
Hemodynamic instability, including poor perfusion, tachycardia, or hypotension, is a critical sign of sepsis in newborns, as reported by the CDC 4
Blood cultures can be sterile in 15-33% of newborns with meningitis, making lumbar puncture essential when sepsis is suspected, as emphasized by the CDC 3, 5

Chorioamnionitis during labor is an important risk factor that can reflect intrauterine onset of infection, according to the CDC 2, 6
Intrapartum fever ≥100.4°F (≥38.0°C) is associated with failure of antibiotics to prevent GBS disease, as noted by the CDC 2, 6
The CDC recommends that clinicians do not be falsely reassured by negative maternal GBS screening, as more than 60% of early-onset GBS cases occur in infants born to women who had negative prenatal GBS cultures at 35-37 weeks 3, 7
Intrapartum antibiotics do not mask or delay the clinical presentation of GBS disease, and signs of sepsis will still appear within the first 24 hours in most cases, according to the CDC 1, 8
The American Academy of Pediatrics recommends performing both blood and cerebrospinal fluid cultures in any infant with signs of sepsis, as blood cultures alone may miss up to one-third of meningitis cases 3, 5
Empiric antibiotic therapy should be initiated immediately with intravenous ampicillin for GBS coverage plus an aminoglycoside (gentamicin) or cefotaxime for gram-negative coverage, without waiting for culture results, as recommended by the American Academy of Pediatrics 9, 10, 11