[Editorial: To the memory of Howard Taylor Ricketts].
D049672:History, 19th Century; D049673:History, 20th Century; D010336:Pathology / Q000266:history; D012282:Rickettsia Infections / Q000266:history; D014438:Typhus, Epidemic Louse-Borne / Q000266:history; D014481:United States
Editorial: A la memoria de Howard Taylor Ricketts