<prompt> Viral infection that is least transmitted transplacentally:Hepatitis BRubellaHerpes simplexHIV  <response>: Ans. is a i.e., Hepatitis B Ref: Arora Microbiology, 3rde, p. 702Rubella 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. 