A 28-year-old woman at 39 weeks of gestation is admitted in labor. She developed a rash consistent with chickenpox 2 days before delivery. Given the timing of her illness, the obstetric team is concerned about the risk of neonatal varicella, as the infant may not have received protective maternal antibodies. A newborn infant is delivered to a mother who developed chickenpox 2 days prior to delivery. Which of the following is the most appropriate management for this newborn?
