Diseases & Conditions


Rocky Mountain Spotted Fever

Synonyms of Rocky Mountain Spotted Fever
  • RMSF
  • Sao Paulo Typhus
  • Tickborne Typhus Fever

Disorder Subdivisions

  • Fulminant Rocky Mountain Spotted Fever

General Discussion
Rocky Mountain spotted fever (RMSF) is an infectious disease that belongs to a group of diseases known as the spotted fever group rickettsioses. It is caused by infection with the bacterium Rickettsia rickettsii (R. rickettsii), which is usually transmitted by a tick bite. When introduced into the body, the bacterium spreads by the bloodstream or lymphatic vessels and multiplies within and damages certain cells lining the inside of small blood (vascular) vessels (i.e., endothelial cells) as well as vascular smooth muscle cells. Such damage leads to inflammatory changes of affected blood vessels (vasculitis), leakage of fluid from the blood vessels, an abnormal accumulation of fluid in body tissues (edema), and additional abnormalities, resulting in the symptoms and findings associated with the disease.

Approximately two to 14 days after initial infection, early symptoms may include a high fever, severe headaches, muscle pain (myalgia), nausea, vomiting, loss of appetite (anorexia), abdominal pain, and/or features. In addition, in most individuals with RMSF, a distinctive rash develops about three to five days after fever onset. The rash often initially appears on the skin of the wrists and ankles and spreads to involve the palms of the hands, the soles of the feet, the forearms, the trunk, the buttocks, and the neck and facial areas. The rash typically initially consists of small, flat pinkish spots (macules) that eventually become raised (papules) and darker. The lesions usually develop pin-point reddish spots (petechia) due to localized bleeding (hemorrhaging) and may merge to form larger hemorrhagic patches. In some severe cases, insufficient oxygenated blood supply to certain tissues may lead to areas of tissue loss (necrosis).

R. rickettsii infection may affect blood vessels, tissues, and organs throughout the body, including the lungs, brain and spinal cord (central nervous system), heart, liver, and kidneys. Associated symptoms and findings may vary, depending upon the specific tissues and organs affected. Without timely, appropriate treatment, individuals with severe disease may develop potentially life-threatening complications due to tissue and organ injury and dysfunction.

As its name indicates, the disease was originally recognized in the Rocky Mountain states. It has since been reported throughout the continental United States as well as Mexico, Canada, Central America, and South America. As noted above, in most cases, infection with the R. rickettsii bacterium results from tick bites. Several different types of ticks serve as vectors for the disease, transmitting the R. rickettsii bacterium to humans.

Organizations related to Rocky Mountain Spotted Fever
  • Centers for Disease Control and Prevention
    1600 Clifton Road NE
    Atlanta GA 30333
    Phone #: 404-639-3534
    800 #: 800-311-3435
    e-mail: http://www.cdc.gov/netinfo.htm
    Home page: http://www.cdc.gov/
  • Lyme Disease Foundation
    P.O. Box 332
    Tolland CT 06084
    Phone #: 860-525-2000
    800 #: 800-886-5963
    e-mail: [email protected]
    Home page: http://www.lyme.org
  • NIH/National Institute of Allergy and Infectious Diseases
    6610 Rockledge Drive
    Bethesda MD 20892-6612
    Phone #: 301-496-5717
    800 #: --
    e-mail: N/A
    Home page: http://www.niaid.nih.gov/
  • World Health Organization (WHO) Regional Office for the Americas (AMRO)
    Pan American Health Organization (PAHO)
    Washington DC 20037
    Phone #: 202-974-3000
    800 #: --
    e-mail: [email protected]
    Home page: http://www.who.ch/

For a Complete Report

This is an abstract of a report from the National Organization for Rare Disorders, Inc. ? (NORD). A copy of the complete report can be obtained for a small fee by visiting the NORD website. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational treatments (if available), and references from medical literature. For a full-text version of this topic, see http://www.rarediseases.org/search/rdblist.html