You are the doctor covering the newborn nursery, when a new baby is brought in from the delivery room. The baby was born full term, there were no complications at the time of delivery, and the baby appears well now. The Apgar scores were 9 at 1 minute and 9 at 5 minutes. You review the mother's prenatal history and discover that she had a vaginal swab positive for group B Streptococcus. Upon further review of the records, you note that the mother received one dose of ampicillin three hours prior to delivery, had rupture of membranes for 5 hours, and did not have a fever. The most appropriate initial management of this baby is
A. close observation only
B. complete blood count with differential
C. complete blood count with differential and blood culture
D. complete blood count with differential, blood culture, and lumbar puncture
E. complete blood count with differential, blood culture, lumbar puncture, and chest x-ray
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