Profylakse efter eksposition for skoldkopper og mæslinger er dog påvist for henholdsvis levende skoldkoppevaccine (Oka/ Merck) og vacciner med mæslingevirus fremstillet af Merck & Co., Inc.
However, post-exposure prophylaxis for varicella and measles has been demonstrated with Varicella Vaccine live (Oka/ Merck) and the measles-containing vaccines manufactured by Merck & Co., Inc., respectively.