Gerhard's distinction between typhoid and typhus and its reception in America, 1833-1860.
D049672:History, 19th Century; D006801:Humans; D009626:Terminology as Topic; D014435:Typhoid Fever / Q000266:history*; D014438:Typhus, Epidemic Louse-Borne / Q000266:history*; D014481:United States