Rocky Mountain spotted fever

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Rocky Mountain spotted fever,

infectious disease caused by a rickettsiarickettsia
, any of an order (Rickettsiales) of very small microorganisms, many disease-causing, that live in vertebrates and are transmitted by bloodsucking parasitic arthropods such as fleas, lice (see louse), and ticks.
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. The bacterium is harbored by wild rodents and other animals and is carried by infected ticks of several species that attach themselves to humans. Despite its name, Rocky Mountain spotted fever is most prevalent in the S United States from Virgina, the Carolinas, and Georgia W to Oklahoma; it may be encountered in other tick-infested regions. Symptoms include chills and high fever; a rose-colored skin rash that appears first on the wrists and ankles and spreads to the trunk, the spots turning deep red and running together; headache; and pains in the back, muscles, and joints. In severe cases there may be delirium or coma. Spotted fever is a serious disease; however, it is not usually fatal if antibiotic treatment (usually doxycycline) is administered promptly.

Rocky Mountain Spotted Fever


an acute infectious disease of man, of the group of rickettsioses. A naturally endemic disease, it is encountered in the western hemisphere.

Rocky Mountain spotted fever is usually observed in spring and summer. The causative agent is transmitted by ticks from generation to generation; other reservoirs of the virus include rodents and dogs. The disease develops within two to 14 days after the tick bite. The causative agent may also reach the skin and mucosa when the tick is crushed. The disease is manifested by high fever (39° to 41 °C) and a spotty nodular rash that appears on the second to fifth day. Other symptoms are headache, nausea, vomiting, pains in the bones and muscles, restlessness, and insomnia.

Rocky Mountain spotted fever is treated with antibiotics and oxygen therapy. It is prevented by avoiding tick bites and by disinsectization and immunization.

Rocky Mountain spotted fever

[′räk·ē ′mau̇nt·ən ′späd·əd ′fē·vər]
An acute, infectious, typhuslike disease of man caused by the rickettsial organism Rickettsia rickettsi and transmitted by species of hard-shelled ticks; characterized by sudden onset of chills, headache, fever, and an exanthem on the extremities. Also known as American spotted fever; tick fever; tick typhus.
References in periodicals archive ?
In other words, if a dog gets Lyme disease or Rocky Mountain spotted fever, there's a good chance family members could also come in contact with infected ticks.
Fatal Rocky Mountain spotted fever in the United States, 1999-2007.
National surveillance for Rocky Mountain spotted fever, 1981-1992: epidemiologic summary and evaluation of risk factors for fatal outcome.
Various analyses of blood and skin samples from these people revealed that 11 of the group had clear-cut cases of Rocky Mountain spotted fever and the other five had probable cases.
However, the American dog tick and the lone star tick are proven carriers of Rocky Mountain spotted fever.
Harkess, Oklahoma State Department of Health assistant state epidemiologist, adds, "Many people with a high fever show up in the emergency department and are presumed to have Rocky Mountain spotted fever, although they often don't have the characteristic rash.
Ticks are vectors of Lyme disease and Rocky Mountain spotted fever, which can be transmitted to humans, but they can also cause "tick paralysis" in dogs.
Rocky Mountain spotted fever (RMSF), a life-threatening and rapidly progressing tickborne disease, is caused by infection with the bacterium Rickettsia rickettsii.
The three fatalities observed in a retrospective analysis of six cases of Rocky Mountain spotted fever (RMSF) in children were associated with either a delayed diagnosis pending laboratory findings or delayed antirickettsia treatment.
Short courses of the antibiotic doxycycline can be used to treat rickettsial diseases such as Rocky Mountain spotted fever in young children without staining their teeth or weakening tooth enamel, according to a study published in March in the Journal of Pediatrics.
Rocky Mountain spotted fever has been renamed spotted fever rickettsiosis (6).
Three potentially lethal yet treatable bacterial infections often produce a petechial rash: Staphylococcus aureus sepsis, meningococcal disease, and Rocky Mountain spotted fever, Dr.

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