Schedule an ultrasound examination.The nurse should schedule serial ultrasound examinations to monitor the fetus during the pregnancy to detect the possible development of fetal hydrops. Also, the virus can cause miscarriage, intrauterine growth restriction, fetal anemia, or stillbirth.Currently, there are no antiviral medications available to treat fifth disease.The Haemophilus influenzae type b vaccine is given during infancy and childhood to protect against multiple infections caused by Haemophilus influenzae type b, not fifth disease.An indirect Coombs' test determines whether the client has antibodies to the Rh antigen. The titer determines the prenatal client's sensitization and if there is Rh incompatibility.