<prompt> All of the following statements about parvovirus B - 9 are true except:DNA virusCrosses placenta in only 10 of casesCan cause severe anemiaCan cause aplastic crisis  <response>: Ans. is b i.e., Crosses placenta in only 10 of cases Ref: Jawetz, 24the, p. 414, 417 Maternal infection with B19 virus may pose a serious risk to the fetus, resulting in hydrops fetalis and fetal death due to severe anemia. Fetal loss occurs in fewer than 10 of primary maternal infections and death occurs most commonly before the 20th week of pregnancy. Although there is frequent intrauterine transmission of human parvovirus with estimates of vertical transmission rates of 30 or higher. 