scientists demonstrated Rocky Mountain spotted fever and endemic typhus was transmitted by rat fleas
In 1931, Rolla E. Dyer, Lucius F. Badger, and Adolph S. Rumreich demonstrated that Rocky Mountain spotted fever existed on the eastern seaboard of the U.S. and that endemic (murine) typhus was transmitted by rat fleas.
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Source: U.S. National Library of Medicine
Credit: Image: microscopy image of Gimenez stain of tick hemolymph cells infected with Rickettsia rickettsii, the causative agent of Rocky Mountain spotted fever. Courtesy: Centers for Disease Control and Prevention.
