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Symptoms and Signs of RMSF. The incubation period for Rocky Mountain spotted fever averages 7 days but varies from 3 to 12 days; the shorter the incubation period, the more severe the infection. Onset is abrupt, with severe headache, chills, prostration, and muscular pains. Fever reaches 39.5 to 40° C within several days and remains high (for ...
Credit: CDC. 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. It was a dreaded, often fatal disease, affecting hundreds of people in Idaho.
Despite its name, Rocky Mountain spotted fever (RMSF) occurs in practically all of the United States and throughout Central and South America. Small-vessel vasculitis can cause serious illness affecting the central nervous system, lungs, heart, kidneys, liver, and spleen; untreated mortality is about 20%. Symptoms (severe headache, chills ...
The first symptoms of Rocky Mountain spotted fever (RMSF) typically begin 2-14 days after the bite of an infected tick. The disease is characterized by acute fever, headache, muscle pain, vomiting, and general discomfort. A rash may also develop 2-4 days after the fever begins and often spreads with time.
Rocky Mountain spotted fever is probably the most common rickettsial infection in the United States. It was first recognized in the Rocky Mountain states but occurs throughout most of the continental United States. It is most common in the southeastern and south central United States (North Carolina, Oklahoma, Arkansas, Tennessee, and Missouri).
Rocky Mountain spotted fever (RMSF) is rare in Minnesota, but isolated cases have been reported from various parts of the state. The disease is most commonly reported in south-central and southeastern states. The illness is caused by bacteria called Rickettsia rickettsii, which is transmitted locally by the tick species Dermacentor variabilis ...
Case Definition. Spotted fever rickettsioses (SFR), which captures cases of Rocky Mountain spotted fever (RMSF), rickettsiosis, Pacific Coast tick fever (caused by infection with species 364D), and others, are a group of diseases caused by spotted fever group Rickettsiae (SFGR). These pathogens can cause acute febrile illnesses with headache ...
