Eugenics V is very necessary because it includes herpes simplex virus type 1 infection, herpes simplex virus type 2 infection, rubella virus infection, cytomegalovirus infection, and toxoplasmosis virus infection. The eugenics test should be done for both recent and distant infections among the five viral infections. If it is a recent infection, it can clinically lead to fetal malformation, and any of the recent infections can lead to more serious fetal malformation, so it is very necessary to recommend the eugenics test. If the infection is distant, it will not cause developmental effects on the fetus.