(3) Rapporter har vist, at kvinder smittet med vildtypemæslinger under graviditeten har en forøget risiko for fostermisdannelser.
Although mumps vaccine virus has been shown to infect the placenta and foetus, there is no evidence that it causes congenital malformations in humans; and (3) Reports have indicated that contracting wild-type measles during pregnancy enhances foetal risk.