A 39-year-old woman, G2P2, gave birth 1 week ago to a male, 3250g, at 39 weeks’ gestation. She experienced Group B Strep (GBS) colonization in her first pregnancy and was treated with peripartum intravenous ampicillin. The current pregnancy had no recorded complications. Her GBS status was unknown. Her temperature during delivery was 37.4 C. Rupture of membranes occurred 15 hours prior to Stage 2 delivery of the newborn. The newborn is slightly irritable and is febrile. His lab report shows gram-positive rods. Which of the following is the most likely explanation for the neonate’s irritability?
E. coli
Klebsiella
Listeria
Strep agalactiae
Polymicrobial
