QUESTION 13

 A 34-year-old woman, gravida 2 para 1, at 20 weeks gestation comes to the office in November for a routine prenatal visit She is

feeling well and has had no vaginal bleeding or cramping Several weeks ago, the patient had 2 days of fever and pharyngitis that

resolved spontaneously. Her 3 -year-old son and several of his playmates at day care had similar symptoms. The pregnancy has

otherwise been uncomplicated; prenatal screening results from 13 weeks gestation were as follows:

HIV-1/2 antibody negative

Rapid plasma reagin positive, 1:64 titer

Treponemal antibody absorption test negative

Rubella antibody lgG positive

The patient has no chronic medical conditions and is current on her vaccinations. Vital signs are normal. The uterine fundus is below

the umbilicus. Ultrasound shows a fetus with bilateral periventricular intracranial calcifications and an enlarged liver with multiple

intrahepatic calcifications. The estimated fetal weight is consistent with 16 weeks gestation. Which of the following pathogens is the

most likely cause of this patient's ultrasound findings?

QA Cytomegalovirus

0 B. Influenza virus

0 C. Listeria monocytogenes

QD Parvovirus B19

0 E. Rubella virus

F. Treponema pallidum