International symposium on rickettsiae and rickettsial diseases, Smolenice near Bratislava, 26--29 September, 1967. Opening address.
D003604:Czechoslovakia; D006666:History of Medicine; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D012281:Rickettsia / Q000254:growth & development; D014438:Typhus, Epidemic Louse-Borne / Q000266:history