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  2. Rocky Mountain spotted fever (or "black measles" because of its characteristic rash) was recognized in the early 1800s, and in the last 10 years of the 1800s (1890–1900) it became very common, especially in the Bitterroot Valley of Montana.

    • 2 to 14 days after infection
  3. Early map of the Bitterroot valley. Area in red shows where spotted fever infection occurred.

  4. Rocky Mountain spotted fever, form of tick-borne typhus first described in the Rocky Mountain section of the United States, caused by the bacterium Rickettsia rickettsii and transmitted by certain species of ticks.

    • The Editors of Encyclopaedia Britannica
  5. Rocky Mountain spotted fever is a tickborne disease first recognized in 1896 in the Snake River Valley of Idaho. It was originally called “black measles” because of the look of its rash in the late stages of the illness, when the skin turns black.

  6. Rocky Mountain spotted fever is a serious tickborne illness which can be deadly if not treated early. It is spread by several species of ticks in the United States, including: American dog tick ( Dermacentor variabilis) Brown dog tick ( Rhipicephalus sanguineus) - parts of southwestern United States and Mexico.

  7. Feb 16, 2024 · Rocky Mountain spotted fever (RMSF) is a potentially lethal, but curable tick-borne disease, which was first described in Idaho in the 19 th century. In 1906, Howard Ricketts demonstrated that RMSF was an infectious disease transmitted by ticks . The clinical spectrum of human infection ranges from mild to fulminant disease .

  8. Feb 1, 1992 · Rocky Mountain Spotted Fever: History of a Twentieth-Century Disease. By. pp. Illustrations, maps, charts, notes, bibliographical notes, index. $39.50.) Western Historical Quarterly, Volume 23, Issue 1, February 1992, Pages 118–119, https://doi.org/10.2307/970289.

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