Final answer:
The nurse should screen a pregnant woman for Group B streptococcus (GBS) infection at 36 weeks' gestation to identify those who may require intravenous antibiotics during labor. This helps reduce the risk of early onset neonatal meningitis.
Step-by-step explanation:
The nurse should screen a pregnant woman for group B streptococcus (GBS) infection at 36 weeks' gestation. GBS is a bacterium that can be present in the urogenital and gastrointestinal microbiota of humans. Screening for GBS at 36 weeks allows for the identification of pregnant women who are colonized with GBS and may require intravenous antibiotics during labor to reduce the risk of early onset neonatal meningitis.