<prompt> Which of the following agents infection causes heavy placenta?HSVCMVSyphilisHIV  <response>: Ans. b. CMVSerological testing for primary maternal cytomegalovirus CMV infection during pregnancy is not routine, but ultrasound studies are routine. Therefore, we evaluate placental thickening in women with primary CMV infection during pregnancy.Most are asymptomatic; however, some women have mononucleosis like syndrome. 