What else is new? An historical excursion.
D001317:Austria; D001432:Bacteriology / Q000266:history; D004812:Epidemiologic Methods; D004813:Epidemiology / Q000266:history*; D005260:Female; D005602:France; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D011247:Pregnancy; D011645:Puerperal Infection / Q000209:etiology / Q000266:history; D012899:Smallpox / Q000517:prevention & control; D013223:Statistics as Topic; D006113:United Kingdom; D014481:United States; D014611:Vaccination