Final answer:
Congenital Zika virus syndrome is contracted when a pregnant woman is infected with the Zika virus, which can cross the placenta and cause serious birth defects.
Step-by-step explanation:
Congenital Zika virus syndrome is contracted when a pregnant woman is infected with the Zika virus. The virus can cross the placenta and affect the developing fetus, leading to serious birth defects such as microcephaly, which is characterized by an abnormally small head and brain.