Viral infection that is least transmitted transplacentally:: (A) Hepatitis B, (B) Rubella, (C) Herpes simplex, (D) HIV
Answer is A. Ans. is 'a' i.e., Hepatitis B (Ref: Arora Microbiology, 3rd/e, p. 702)Rubella and HSV are teratogenic virus, so their transplacental transmission is expected to be high, HIV have 30% transplacental transmission but HBV is least transmitted transpalcentally.