Viral infection that is least transmitted transplacentally:
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.
Hepatitis B
Rubella
Herpes simplex
HIV
Virology