Retrospective and prospective views on the use of viral vaccines.
D000818:Animals; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D007167:Immunotherapy / Q000266:history*; D011446:Prospective Studies; D012189:Retrospective Studies; D014765:Viral Vaccines / Q000266:history*
D014765:Viral Vaccines